mirror of https://github.com/lidarr/Lidarr
1861 lines
60 KiB
JavaScript
1861 lines
60 KiB
JavaScript
/* vim: set tabstop=4 softtabstop=4 shiftwidth=4 noexpandtab: */
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/**
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* Backbone-relational.js 0.8.5
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* (c) 2011-2013 Paul Uithol and contributors (https://github.com/PaulUithol/Backbone-relational/graphs/contributors)
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*
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* Backbone-relational may be freely distributed under the MIT license; see the accompanying LICENSE.txt.
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* For details and documentation: https://github.com/PaulUithol/Backbone-relational.
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* Depends on Backbone (and thus on Underscore as well): https://github.com/documentcloud/backbone.
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*/
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( function( undefined ) {
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"use strict";
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/**
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* CommonJS shim
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**/
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var _, Backbone, exports;
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if ( typeof window === 'undefined' ) {
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_ = require( 'underscore' );
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Backbone = require( 'backbone' );
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exports = module.exports = Backbone;
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}
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else {
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_ = window._;
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Backbone = window.Backbone;
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exports = window;
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}
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Backbone.Relational = {
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showWarnings: true
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};
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/**
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* Semaphore mixin; can be used as both binary and counting.
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**/
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Backbone.Semaphore = {
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_permitsAvailable: null,
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_permitsUsed: 0,
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acquire: function() {
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if ( this._permitsAvailable && this._permitsUsed >= this._permitsAvailable ) {
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throw new Error( 'Max permits acquired' );
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}
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else {
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this._permitsUsed++;
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}
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},
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release: function() {
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if ( this._permitsUsed === 0 ) {
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throw new Error( 'All permits released' );
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}
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else {
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this._permitsUsed--;
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}
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},
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isLocked: function() {
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return this._permitsUsed > 0;
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},
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setAvailablePermits: function( amount ) {
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if ( this._permitsUsed > amount ) {
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throw new Error( 'Available permits cannot be less than used permits' );
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}
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this._permitsAvailable = amount;
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}
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};
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/**
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* A BlockingQueue that accumulates items while blocked (via 'block'),
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* and processes them when unblocked (via 'unblock').
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* Process can also be called manually (via 'process').
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*/
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Backbone.BlockingQueue = function() {
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this._queue = [];
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};
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_.extend( Backbone.BlockingQueue.prototype, Backbone.Semaphore, {
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_queue: null,
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add: function( func ) {
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if ( this.isBlocked() ) {
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this._queue.push( func );
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}
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else {
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func();
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}
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},
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process: function() {
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while ( this._queue && this._queue.length ) {
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this._queue.shift()();
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}
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},
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block: function() {
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this.acquire();
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},
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unblock: function() {
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this.release();
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if ( !this.isBlocked() ) {
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this.process();
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}
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},
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isBlocked: function() {
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return this.isLocked();
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}
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});
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/**
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* Global event queue. Accumulates external events ('add:<key>', 'remove:<key>' and 'change:<key>')
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* until the top-level object is fully initialized (see 'Backbone.RelationalModel').
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*/
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Backbone.Relational.eventQueue = new Backbone.BlockingQueue();
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/**
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* Backbone.Store keeps track of all created (and destruction of) Backbone.RelationalModel.
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* Handles lookup for relations.
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*/
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Backbone.Store = function() {
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this._collections = [];
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this._reverseRelations = [];
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this._orphanRelations = [];
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this._subModels = [];
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this._modelScopes = [ exports ];
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};
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_.extend( Backbone.Store.prototype, Backbone.Events, {
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/**
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* Create a new `Relation`.
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* @param {Backbone.RelationalModel} [model]
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* @param {Object} relation
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* @param {Object} [options]
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*/
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initializeRelation: function( model, relation, options ) {
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var type = !_.isString( relation.type ) ? relation.type : Backbone[ relation.type ] || this.getObjectByName( relation.type );
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if ( type && type.prototype instanceof Backbone.Relation ) {
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new type( model, relation, options ); // Also pushes the new Relation into `model._relations`
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}
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else {
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Backbone.Relational.showWarnings && typeof console !== 'undefined' && console.warn( 'Relation=%o; missing or invalid relation type!', relation );
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}
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},
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/**
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* Add a scope for `getObjectByName` to look for model types by name.
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* @param {Object} scope
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*/
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addModelScope: function( scope ) {
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this._modelScopes.push( scope );
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},
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/**
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* Remove a scope.
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* @param {Object} scope
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*/
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removeModelScope: function( scope ) {
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this._modelScopes = _.without( this._modelScopes, scope );
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},
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/**
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* Add a set of subModelTypes to the store, that can be used to resolve the '_superModel'
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* for a model later in 'setupSuperModel'.
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*
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* @param {Backbone.RelationalModel} subModelTypes
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* @param {Backbone.RelationalModel} superModelType
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*/
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addSubModels: function( subModelTypes, superModelType ) {
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this._subModels.push({
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'superModelType': superModelType,
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'subModels': subModelTypes
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});
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},
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/**
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* Check if the given modelType is registered as another model's subModel. If so, add it to the super model's
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* '_subModels', and set the modelType's '_superModel', '_subModelTypeName', and '_subModelTypeAttribute'.
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*
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* @param {Backbone.RelationalModel} modelType
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*/
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setupSuperModel: function( modelType ) {
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_.find( this._subModels, function( subModelDef ) {
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return _.find( subModelDef.subModels || [], function( subModelTypeName, typeValue ) {
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var subModelType = this.getObjectByName( subModelTypeName );
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if ( modelType === subModelType ) {
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// Set 'modelType' as a child of the found superModel
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subModelDef.superModelType._subModels[ typeValue ] = modelType;
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// Set '_superModel', '_subModelTypeValue', and '_subModelTypeAttribute' on 'modelType'.
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modelType._superModel = subModelDef.superModelType;
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modelType._subModelTypeValue = typeValue;
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modelType._subModelTypeAttribute = subModelDef.superModelType.prototype.subModelTypeAttribute;
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return true;
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}
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}, this );
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}, this );
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},
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/**
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* Add a reverse relation. Is added to the 'relations' property on model's prototype, and to
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* existing instances of 'model' in the store as well.
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* @param {Object} relation
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* @param {Backbone.RelationalModel} relation.model
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* @param {String} relation.type
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* @param {String} relation.key
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* @param {String|Object} relation.relatedModel
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*/
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addReverseRelation: function( relation ) {
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var exists = _.any( this._reverseRelations, function( rel ) {
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return _.all( relation || [], function( val, key ) {
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return val === rel[ key ];
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});
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});
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if ( !exists && relation.model && relation.type ) {
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this._reverseRelations.push( relation );
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this._addRelation( relation.model, relation );
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this.retroFitRelation( relation );
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}
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},
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/**
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* Deposit a `relation` for which the `relatedModel` can't be resolved at the moment.
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*
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* @param {Object} relation
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*/
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addOrphanRelation: function( relation ) {
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var exists = _.any( this._orphanRelations, function( rel ) {
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return _.all( relation || [], function( val, key ) {
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return val === rel[ key ];
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});
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});
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if ( !exists && relation.model && relation.type ) {
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this._orphanRelations.push( relation );
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}
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},
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/**
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* Try to initialize any `_orphanRelation`s
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*/
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processOrphanRelations: function() {
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// Make sure to operate on a copy since we're removing while iterating
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_.each( this._orphanRelations.slice( 0 ), function( rel ) {
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var relatedModel = Backbone.Relational.store.getObjectByName( rel.relatedModel );
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if ( relatedModel ) {
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this.initializeRelation( null, rel );
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this._orphanRelations = _.without( this._orphanRelations, rel );
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}
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}, this );
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},
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/**
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*
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* @param {Backbone.RelationalModel.constructor} type
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* @param {Object} relation
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* @private
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*/
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_addRelation: function( type, relation ) {
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if ( !type.prototype.relations ) {
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type.prototype.relations = [];
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}
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type.prototype.relations.push( relation );
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_.each( type._subModels || [], function( subModel ) {
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this._addRelation( subModel, relation );
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}, this );
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},
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/**
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* Add a 'relation' to all existing instances of 'relation.model' in the store
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* @param {Object} relation
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*/
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retroFitRelation: function( relation ) {
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var coll = this.getCollection( relation.model, false );
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coll && coll.each( function( model ) {
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if ( !( model instanceof relation.model ) ) {
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return;
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}
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new relation.type( model, relation );
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}, this );
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},
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/**
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* Find the Store's collection for a certain type of model.
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* @param {Backbone.RelationalModel} type
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* @param {Boolean} [create=true] Should a collection be created if none is found?
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* @return {Backbone.Collection} A collection if found (or applicable for 'model'), or null
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*/
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getCollection: function( type, create ) {
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if ( type instanceof Backbone.RelationalModel ) {
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type = type.constructor;
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}
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var rootModel = type;
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while ( rootModel._superModel ) {
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rootModel = rootModel._superModel;
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}
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var coll = _.findWhere( this._collections, { model: rootModel } );
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if ( !coll && create !== false ) {
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coll = this._createCollection( rootModel );
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}
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return coll;
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},
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/**
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* Find a model type on one of the modelScopes by name. Names are split on dots.
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* @param {String} name
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* @return {Object}
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*/
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getObjectByName: function( name ) {
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var parts = name.split( '.' ),
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type = null;
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_.find( this._modelScopes, function( scope ) {
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type = _.reduce( parts || [], function( memo, val ) {
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return memo ? memo[ val ] : undefined;
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}, scope );
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if ( type && type !== scope ) {
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return true;
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}
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}, this );
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return type;
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},
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_createCollection: function( type ) {
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var coll;
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// If 'type' is an instance, take its constructor
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if ( type instanceof Backbone.RelationalModel ) {
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type = type.constructor;
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}
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// Type should inherit from Backbone.RelationalModel.
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if ( type.prototype instanceof Backbone.RelationalModel ) {
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coll = new Backbone.Collection();
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coll.model = type;
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this._collections.push( coll );
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}
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return coll;
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},
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/**
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* Find the attribute that is to be used as the `id` on a given object
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* @param type
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* @param {String|Number|Object|Backbone.RelationalModel} item
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* @return {String|Number}
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*/
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resolveIdForItem: function( type, item ) {
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var id = _.isString( item ) || _.isNumber( item ) ? item : null;
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if ( id === null ) {
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if ( item instanceof Backbone.RelationalModel ) {
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id = item.id;
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}
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else if ( _.isObject( item ) ) {
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id = item[ type.prototype.idAttribute ];
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}
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}
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// Make all falsy values `null` (except for 0, which could be an id.. see '/issues/179')
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if ( !id && id !== 0 ) {
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id = null;
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}
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return id;
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},
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/**
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* Find a specific model of a certain `type` in the store
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* @param type
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* @param {String|Number|Object|Backbone.RelationalModel} item
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*/
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find: function( type, item ) {
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var id = this.resolveIdForItem( type, item );
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var coll = this.getCollection( type );
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// Because the found object could be of any of the type's superModel
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// types, only return it if it's actually of the type asked for.
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if ( coll ) {
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var obj = coll.get( id );
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if ( obj instanceof type ) {
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return obj;
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}
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}
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return null;
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},
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/**
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* Add a 'model' to its appropriate collection. Retain the original contents of 'model.collection'.
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* @param {Backbone.RelationalModel} model
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*/
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register: function( model ) {
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var coll = this.getCollection( model );
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if ( coll ) {
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var modelColl = model.collection;
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coll.add( model );
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this.listenTo( model, 'destroy', this.unregister, this );
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model.collection = modelColl;
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}
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},
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/**
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* Check if the given model may use the given `id`
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* @param model
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* @param [id]
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*/
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checkId: function( model, id ) {
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var coll = this.getCollection( model ),
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duplicate = coll && coll.get( id );
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if ( duplicate && model !== duplicate ) {
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if ( Backbone.Relational.showWarnings && typeof console !== 'undefined' ) {
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console.warn( 'Duplicate id! Old RelationalModel=%o, new RelationalModel=%o', duplicate, model );
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}
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throw new Error( "Cannot instantiate more than one Backbone.RelationalModel with the same id per type!" );
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}
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},
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/**
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* Explicitly update a model's id in its store collection
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* @param {Backbone.RelationalModel} model
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*/
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update: function( model ) {
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var coll = this.getCollection( model );
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// This triggers updating the lookup indices kept in a collection
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coll._onModelEvent( 'change:' + model.idAttribute, model, coll );
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// Trigger an event on model so related models (having the model's new id in their keyContents) can add it.
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model.trigger( 'relational:change:id', model, coll );
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},
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/**
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* Remove a 'model' from the store.
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* @param {Backbone.RelationalModel} model
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*/
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unregister: function( model ) {
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this.stopListening( model, 'destroy', this.unregister );
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var coll = this.getCollection( model );
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coll && coll.remove( model );
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},
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/**
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* Reset the `store` to it's original state. The `reverseRelations` are kept though, since attempting to
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* re-initialize these on models would lead to a large amount of warnings.
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*/
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reset: function() {
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this.stopListening();
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this._collections = [];
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this._subModels = [];
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this._modelScopes = [ exports ];
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}
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});
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Backbone.Relational.store = new Backbone.Store();
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/**
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* The main Relation class, from which 'HasOne' and 'HasMany' inherit. Internally, 'relational:<key>' events
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* are used to regulate addition and removal of models from relations.
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*
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* @param {Backbone.RelationalModel} [instance] Model that this relation is created for. If no model is supplied,
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* Relation just tries to instantiate it's `reverseRelation` if specified, and bails out after that.
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* @param {Object} options
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* @param {string} options.key
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* @param {Backbone.RelationalModel.constructor} options.relatedModel
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* @param {Boolean|String} [options.includeInJSON=true] Serialize the given attribute for related model(s)' in toJSON, or just their ids.
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* @param {Boolean} [options.createModels=true] Create objects from the contents of keys if the object is not found in Backbone.store.
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* @param {Object} [options.reverseRelation] Specify a bi-directional relation. If provided, Relation will reciprocate
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* the relation to the 'relatedModel'. Required and optional properties match 'options', except that it also needs
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* {Backbone.Relation|String} type ('HasOne' or 'HasMany').
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* @param {Object} opts
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*/
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Backbone.Relation = function( instance, options, opts ) {
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this.instance = instance;
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// Make sure 'options' is sane, and fill with defaults from subclasses and this object's prototype
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options = _.isObject( options ) ? options : {};
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this.reverseRelation = _.defaults( options.reverseRelation || {}, this.options.reverseRelation );
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this.options = _.defaults( options, this.options, Backbone.Relation.prototype.options );
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this.reverseRelation.type = !_.isString( this.reverseRelation.type ) ? this.reverseRelation.type :
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Backbone[ this.reverseRelation.type ] || Backbone.Relational.store.getObjectByName( this.reverseRelation.type );
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this.key = this.options.key;
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this.keySource = this.options.keySource || this.key;
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this.keyDestination = this.options.keyDestination || this.keySource || this.key;
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this.model = this.options.model || this.instance.constructor;
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this.relatedModel = this.options.relatedModel;
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if ( _.isString( this.relatedModel ) ) {
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this.relatedModel = Backbone.Relational.store.getObjectByName( this.relatedModel );
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}
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if ( !this.checkPreconditions() ) {
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return;
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}
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// Add the reverse relation on 'relatedModel' to the store's reverseRelations
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if ( !this.options.isAutoRelation && this.reverseRelation.type && this.reverseRelation.key ) {
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Backbone.Relational.store.addReverseRelation( _.defaults( {
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isAutoRelation: true,
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model: this.relatedModel,
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relatedModel: this.model,
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reverseRelation: this.options // current relation is the 'reverseRelation' for its own reverseRelation
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},
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this.reverseRelation // Take further properties from this.reverseRelation (type, key, etc.)
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) );
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}
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if ( instance ) {
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var contentKey = this.keySource;
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if ( contentKey !== this.key && typeof this.instance.get( this.key ) === 'object' ) {
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contentKey = this.key;
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}
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this.setKeyContents( this.instance.get( contentKey ) );
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this.relatedCollection = Backbone.Relational.store.getCollection( this.relatedModel );
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// Explicitly clear 'keySource', to prevent a leaky abstraction if 'keySource' differs from 'key'.
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|
if ( this.keySource !== this.key ) {
|
|
this.instance.unset( this.keySource, { silent: true } );
|
|
}
|
|
|
|
// Add this Relation to instance._relations
|
|
this.instance._relations[ this.key ] = this;
|
|
|
|
this.initialize( opts );
|
|
|
|
if ( this.options.autoFetch ) {
|
|
this.instance.fetchRelated( this.key, _.isObject( this.options.autoFetch ) ? this.options.autoFetch : {} );
|
|
}
|
|
|
|
// When 'relatedModel' are created or destroyed, check if it affects this relation.
|
|
this.listenTo( this.instance, 'destroy', this.destroy )
|
|
.listenTo( this.relatedCollection, 'relational:add relational:change:id', this.tryAddRelated )
|
|
.listenTo( this.relatedCollection, 'relational:remove', this.removeRelated )
|
|
}
|
|
};
|
|
// Fix inheritance :\
|
|
Backbone.Relation.extend = Backbone.Model.extend;
|
|
// Set up all inheritable **Backbone.Relation** properties and methods.
|
|
_.extend( Backbone.Relation.prototype, Backbone.Events, Backbone.Semaphore, {
|
|
options: {
|
|
createModels: true,
|
|
includeInJSON: true,
|
|
isAutoRelation: false,
|
|
autoFetch: false,
|
|
parse: false
|
|
},
|
|
|
|
instance: null,
|
|
key: null,
|
|
keyContents: null,
|
|
relatedModel: null,
|
|
relatedCollection: null,
|
|
reverseRelation: null,
|
|
related: null,
|
|
|
|
/**
|
|
* Check several pre-conditions.
|
|
* @return {Boolean} True if pre-conditions are satisfied, false if they're not.
|
|
*/
|
|
checkPreconditions: function() {
|
|
var i = this.instance,
|
|
k = this.key,
|
|
m = this.model,
|
|
rm = this.relatedModel,
|
|
warn = Backbone.Relational.showWarnings && typeof console !== 'undefined';
|
|
|
|
if ( !m || !k || !rm ) {
|
|
warn && console.warn( 'Relation=%o: missing model, key or relatedModel (%o, %o, %o).', this, m, k, rm );
|
|
return false;
|
|
}
|
|
// Check if the type in 'model' inherits from Backbone.RelationalModel
|
|
if ( !( m.prototype instanceof Backbone.RelationalModel ) ) {
|
|
warn && console.warn( 'Relation=%o: model does not inherit from Backbone.RelationalModel (%o).', this, i );
|
|
return false;
|
|
}
|
|
// Check if the type in 'relatedModel' inherits from Backbone.RelationalModel
|
|
if ( !( rm.prototype instanceof Backbone.RelationalModel ) ) {
|
|
warn && console.warn( 'Relation=%o: relatedModel does not inherit from Backbone.RelationalModel (%o).', this, rm );
|
|
return false;
|
|
}
|
|
// Check if this is not a HasMany, and the reverse relation is HasMany as well
|
|
if ( this instanceof Backbone.HasMany && this.reverseRelation.type === Backbone.HasMany ) {
|
|
warn && console.warn( 'Relation=%o: relation is a HasMany, and the reverseRelation is HasMany as well.', this );
|
|
return false;
|
|
}
|
|
// Check if we're not attempting to create a relationship on a `key` that's already used.
|
|
if ( i && _.keys( i._relations ).length ) {
|
|
var existing = _.find( i._relations, function( rel ) {
|
|
return rel.key === k;
|
|
}, this );
|
|
|
|
if ( existing ) {
|
|
warn && console.warn( 'Cannot create relation=%o on %o for model=%o: already taken by relation=%o.',
|
|
this, k, i, existing );
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
},
|
|
|
|
/**
|
|
* Set the related model(s) for this relation
|
|
* @param {Backbone.Model|Backbone.Collection} related
|
|
*/
|
|
setRelated: function( related ) {
|
|
this.related = related;
|
|
|
|
this.instance.acquire();
|
|
this.instance.attributes[ this.key ] = related;
|
|
this.instance.release();
|
|
},
|
|
|
|
/**
|
|
* Determine if a relation (on a different RelationalModel) is the reverse
|
|
* relation of the current one.
|
|
* @param {Backbone.Relation} relation
|
|
* @return {Boolean}
|
|
*/
|
|
_isReverseRelation: function( relation ) {
|
|
return relation.instance instanceof this.relatedModel && this.reverseRelation.key === relation.key &&
|
|
this.key === relation.reverseRelation.key;
|
|
},
|
|
|
|
/**
|
|
* Get the reverse relations (pointing back to 'this.key' on 'this.instance') for the currently related model(s).
|
|
* @param {Backbone.RelationalModel} [model] Get the reverse relations for a specific model.
|
|
* If not specified, 'this.related' is used.
|
|
* @return {Backbone.Relation[]}
|
|
*/
|
|
getReverseRelations: function( model ) {
|
|
var reverseRelations = [];
|
|
// Iterate over 'model', 'this.related.models' (if this.related is a Backbone.Collection), or wrap 'this.related' in an array.
|
|
var models = !_.isUndefined( model ) ? [ model ] : this.related && ( this.related.models || [ this.related ] );
|
|
_.each( models || [], function( related ) {
|
|
_.each( related.getRelations() || [], function( relation ) {
|
|
if ( this._isReverseRelation( relation ) ) {
|
|
reverseRelations.push( relation );
|
|
}
|
|
}, this );
|
|
}, this );
|
|
|
|
return reverseRelations;
|
|
},
|
|
|
|
/**
|
|
* When `this.instance` is destroyed, cleanup our relations.
|
|
* Get reverse relation, call removeRelated on each.
|
|
*/
|
|
destroy: function() {
|
|
this.stopListening();
|
|
|
|
if ( this instanceof Backbone.HasOne ) {
|
|
this.setRelated( null );
|
|
}
|
|
else if ( this instanceof Backbone.HasMany ) {
|
|
this.setRelated( this._prepareCollection() );
|
|
}
|
|
|
|
_.each( this.getReverseRelations(), function( relation ) {
|
|
relation.removeRelated( this.instance );
|
|
}, this );
|
|
}
|
|
});
|
|
|
|
Backbone.HasOne = Backbone.Relation.extend({
|
|
options: {
|
|
reverseRelation: { type: 'HasMany' }
|
|
},
|
|
|
|
initialize: function( opts ) {
|
|
this.listenTo( this.instance, 'relational:change:' + this.key, this.onChange );
|
|
|
|
var related = this.findRelated( opts );
|
|
this.setRelated( related );
|
|
|
|
// Notify new 'related' object of the new relation.
|
|
_.each( this.getReverseRelations(), function( relation ) {
|
|
relation.addRelated( this.instance, opts );
|
|
}, this );
|
|
},
|
|
|
|
/**
|
|
* Find related Models.
|
|
* @param {Object} [options]
|
|
* @return {Backbone.Model}
|
|
*/
|
|
findRelated: function( options ) {
|
|
var related = null;
|
|
|
|
options = _.defaults( { parse: this.options.parse }, options );
|
|
|
|
if ( this.keyContents instanceof this.relatedModel ) {
|
|
related = this.keyContents;
|
|
}
|
|
else if ( this.keyContents || this.keyContents === 0 ) { // since 0 can be a valid `id` as well
|
|
var opts = _.defaults( { create: this.options.createModels }, options );
|
|
related = this.relatedModel.findOrCreate( this.keyContents, opts );
|
|
}
|
|
|
|
// Nullify `keyId` if we have a related model; in case it was already part of the relation
|
|
if ( this.related ) {
|
|
this.keyId = null;
|
|
}
|
|
|
|
return related;
|
|
},
|
|
|
|
/**
|
|
* Normalize and reduce `keyContents` to an `id`, for easier comparison
|
|
* @param {String|Number|Backbone.Model} keyContents
|
|
*/
|
|
setKeyContents: function( keyContents ) {
|
|
this.keyContents = keyContents;
|
|
this.keyId = Backbone.Relational.store.resolveIdForItem( this.relatedModel, this.keyContents );
|
|
},
|
|
|
|
/**
|
|
* Event handler for `change:<key>`.
|
|
* If the key is changed, notify old & new reverse relations and initialize the new relation.
|
|
*/
|
|
onChange: function( model, attr, options ) {
|
|
// Don't accept recursive calls to onChange (like onChange->findRelated->findOrCreate->initializeRelations->addRelated->onChange)
|
|
if ( this.isLocked() ) {
|
|
return;
|
|
}
|
|
this.acquire();
|
|
options = options ? _.clone( options ) : {};
|
|
|
|
// 'options.__related' is set by 'addRelated'/'removeRelated'. If it is set, the change
|
|
// is the result of a call from a relation. If it's not, the change is the result of
|
|
// a 'set' call on this.instance.
|
|
var changed = _.isUndefined( options.__related ),
|
|
oldRelated = changed ? this.related : options.__related;
|
|
|
|
if ( changed ) {
|
|
this.setKeyContents( attr );
|
|
var related = this.findRelated( options );
|
|
this.setRelated( related );
|
|
}
|
|
|
|
// Notify old 'related' object of the terminated relation
|
|
if ( oldRelated && this.related !== oldRelated ) {
|
|
_.each( this.getReverseRelations( oldRelated ), function( relation ) {
|
|
relation.removeRelated( this.instance, null, options );
|
|
}, this );
|
|
}
|
|
|
|
// Notify new 'related' object of the new relation. Note we do re-apply even if this.related is oldRelated;
|
|
// that can be necessary for bi-directional relations if 'this.instance' was created after 'this.related'.
|
|
// In that case, 'this.instance' will already know 'this.related', but the reverse might not exist yet.
|
|
_.each( this.getReverseRelations(), function( relation ) {
|
|
relation.addRelated( this.instance, options );
|
|
}, this );
|
|
|
|
// Fire the 'change:<key>' event if 'related' was updated
|
|
if ( !options.silent && this.related !== oldRelated ) {
|
|
var dit = this;
|
|
this.changed = true;
|
|
Backbone.Relational.eventQueue.add( function() {
|
|
dit.instance.trigger( 'change:' + dit.key, dit.instance, dit.related, options, true );
|
|
dit.changed = false;
|
|
});
|
|
}
|
|
this.release();
|
|
},
|
|
|
|
/**
|
|
* If a new 'this.relatedModel' appears in the 'store', try to match it to the last set 'keyContents'
|
|
*/
|
|
tryAddRelated: function( model, coll, options ) {
|
|
if ( ( this.keyId || this.keyId === 0 ) && model.id === this.keyId ) { // since 0 can be a valid `id` as well
|
|
this.addRelated( model, options );
|
|
this.keyId = null;
|
|
}
|
|
},
|
|
|
|
addRelated: function( model, options ) {
|
|
// Allow 'model' to set up its relations before proceeding.
|
|
// (which can result in a call to 'addRelated' from a relation of 'model')
|
|
var dit = this;
|
|
model.queue( function() {
|
|
if ( model !== dit.related ) {
|
|
var oldRelated = dit.related || null;
|
|
dit.setRelated( model );
|
|
dit.onChange( dit.instance, model, _.defaults( { __related: oldRelated }, options ) );
|
|
}
|
|
});
|
|
},
|
|
|
|
removeRelated: function( model, coll, options ) {
|
|
if ( !this.related ) {
|
|
return;
|
|
}
|
|
|
|
if ( model === this.related ) {
|
|
var oldRelated = this.related || null;
|
|
this.setRelated( null );
|
|
this.onChange( this.instance, model, _.defaults( { __related: oldRelated }, options ) );
|
|
}
|
|
}
|
|
});
|
|
|
|
Backbone.HasMany = Backbone.Relation.extend({
|
|
collectionType: null,
|
|
|
|
options: {
|
|
reverseRelation: { type: 'HasOne' },
|
|
collectionType: Backbone.Collection,
|
|
collectionKey: true,
|
|
collectionOptions: {}
|
|
},
|
|
|
|
initialize: function( opts ) {
|
|
this.listenTo( this.instance, 'relational:change:' + this.key, this.onChange );
|
|
|
|
// Handle a custom 'collectionType'
|
|
this.collectionType = this.options.collectionType;
|
|
if ( _.isString( this.collectionType ) ) {
|
|
this.collectionType = Backbone.Relational.store.getObjectByName( this.collectionType );
|
|
}
|
|
if ( this.collectionType !== Backbone.Collection && !( this.collectionType.prototype instanceof Backbone.Collection ) ) {
|
|
throw new Error( '`collectionType` must inherit from Backbone.Collection' );
|
|
}
|
|
|
|
var related = this.findRelated( opts );
|
|
this.setRelated( related );
|
|
},
|
|
|
|
/**
|
|
* Bind events and setup collectionKeys for a collection that is to be used as the backing store for a HasMany.
|
|
* If no 'collection' is supplied, a new collection will be created of the specified 'collectionType' option.
|
|
* @param {Backbone.Collection} [collection]
|
|
* @return {Backbone.Collection}
|
|
*/
|
|
_prepareCollection: function( collection ) {
|
|
if ( this.related ) {
|
|
this.stopListening( this.related );
|
|
}
|
|
|
|
if ( !collection || !( collection instanceof Backbone.Collection ) ) {
|
|
var options = _.isFunction( this.options.collectionOptions ) ?
|
|
this.options.collectionOptions( this.instance ) : this.options.collectionOptions;
|
|
|
|
collection = new this.collectionType( null, options );
|
|
}
|
|
|
|
collection.model = this.relatedModel;
|
|
|
|
if ( this.options.collectionKey ) {
|
|
var key = this.options.collectionKey === true ? this.options.reverseRelation.key : this.options.collectionKey;
|
|
|
|
if ( collection[ key ] && collection[ key ] !== this.instance ) {
|
|
if ( Backbone.Relational.showWarnings && typeof console !== 'undefined' ) {
|
|
console.warn( 'Relation=%o; collectionKey=%s already exists on collection=%o', this, key, this.options.collectionKey );
|
|
}
|
|
}
|
|
else if ( key ) {
|
|
collection[ key ] = this.instance;
|
|
}
|
|
}
|
|
|
|
this.listenTo( collection, 'relational:add', this.handleAddition )
|
|
.listenTo( collection, 'relational:remove', this.handleRemoval )
|
|
.listenTo( collection, 'relational:reset', this.handleReset );
|
|
|
|
return collection;
|
|
},
|
|
|
|
/**
|
|
* Find related Models.
|
|
* @param {Object} [options]
|
|
* @return {Backbone.Collection}
|
|
*/
|
|
findRelated: function( options ) {
|
|
var related = null;
|
|
|
|
options = _.defaults( { parse: this.options.parse }, options );
|
|
|
|
// Replace 'this.related' by 'this.keyContents' if it is a Backbone.Collection
|
|
if ( this.keyContents instanceof Backbone.Collection ) {
|
|
this._prepareCollection( this.keyContents );
|
|
related = this.keyContents;
|
|
}
|
|
// Otherwise, 'this.keyContents' should be an array of related object ids.
|
|
// Re-use the current 'this.related' if it is a Backbone.Collection; otherwise, create a new collection.
|
|
else {
|
|
var toAdd = [];
|
|
|
|
_.each( this.keyContents, function( attributes ) {
|
|
if ( attributes instanceof this.relatedModel ) {
|
|
var model = attributes;
|
|
}
|
|
else {
|
|
// If `merge` is true, update models here, instead of during update.
|
|
model = this.relatedModel.findOrCreate( attributes,
|
|
_.extend( { merge: true }, options, { create: this.options.createModels } )
|
|
);
|
|
}
|
|
|
|
model && toAdd.push( model );
|
|
}, this );
|
|
|
|
if ( this.related instanceof Backbone.Collection ) {
|
|
related = this.related;
|
|
}
|
|
else {
|
|
related = this._prepareCollection();
|
|
}
|
|
|
|
// By now, both `merge` and `parse` will already have been executed for models if they were specified.
|
|
// Disable them to prevent additional calls.
|
|
related.set( toAdd, _.defaults( { merge: false, parse: false }, options ) );
|
|
}
|
|
|
|
// Remove entries from `keyIds` that were already part of the relation (and are thus 'unchanged')
|
|
this.keyIds = _.difference( this.keyIds, _.pluck( related.models, 'id' ) );
|
|
|
|
return related;
|
|
},
|
|
|
|
/**
|
|
* Normalize and reduce `keyContents` to a list of `ids`, for easier comparison
|
|
* @param {String|Number|String[]|Number[]|Backbone.Collection} keyContents
|
|
*/
|
|
setKeyContents: function( keyContents ) {
|
|
this.keyContents = keyContents instanceof Backbone.Collection ? keyContents : null;
|
|
this.keyIds = [];
|
|
|
|
if ( !this.keyContents && ( keyContents || keyContents === 0 ) ) { // since 0 can be a valid `id` as well
|
|
// Handle cases the an API/user supplies just an Object/id instead of an Array
|
|
this.keyContents = _.isArray( keyContents ) ? keyContents : [ keyContents ];
|
|
|
|
_.each( this.keyContents, function( item ) {
|
|
var itemId = Backbone.Relational.store.resolveIdForItem( this.relatedModel, item );
|
|
if ( itemId || itemId === 0 ) {
|
|
this.keyIds.push( itemId );
|
|
}
|
|
}, this );
|
|
}
|
|
},
|
|
|
|
/**
|
|
* Event handler for `change:<key>`.
|
|
* If the contents of the key are changed, notify old & new reverse relations and initialize the new relation.
|
|
*/
|
|
onChange: function( model, attr, options ) {
|
|
options = options ? _.clone( options ) : {};
|
|
this.setKeyContents( attr );
|
|
this.changed = false;
|
|
|
|
var related = this.findRelated( options );
|
|
this.setRelated( related );
|
|
|
|
if ( !options.silent ) {
|
|
var dit = this;
|
|
Backbone.Relational.eventQueue.add( function() {
|
|
// The `changed` flag can be set in `handleAddition` or `handleRemoval`
|
|
if ( dit.changed ) {
|
|
dit.instance.trigger( 'change:' + dit.key, dit.instance, dit.related, options, true );
|
|
dit.changed = false;
|
|
}
|
|
});
|
|
}
|
|
},
|
|
|
|
/**
|
|
* When a model is added to a 'HasMany', trigger 'add' on 'this.instance' and notify reverse relations.
|
|
* (should be 'HasOne', must set 'this.instance' as their related).
|
|
*/
|
|
handleAddition: function( model, coll, options ) {
|
|
//console.debug('handleAddition called; args=%o', arguments);
|
|
options = options ? _.clone( options ) : {};
|
|
this.changed = true;
|
|
|
|
_.each( this.getReverseRelations( model ), function( relation ) {
|
|
relation.addRelated( this.instance, options );
|
|
}, this );
|
|
|
|
// Only trigger 'add' once the newly added model is initialized (so, has its relations set up)
|
|
var dit = this;
|
|
!options.silent && Backbone.Relational.eventQueue.add( function() {
|
|
dit.instance.trigger( 'add:' + dit.key, model, dit.related, options );
|
|
});
|
|
},
|
|
|
|
/**
|
|
* When a model is removed from a 'HasMany', trigger 'remove' on 'this.instance' and notify reverse relations.
|
|
* (should be 'HasOne', which should be nullified)
|
|
*/
|
|
handleRemoval: function( model, coll, options ) {
|
|
//console.debug('handleRemoval called; args=%o', arguments);
|
|
options = options ? _.clone( options ) : {};
|
|
this.changed = true;
|
|
|
|
_.each( this.getReverseRelations( model ), function( relation ) {
|
|
relation.removeRelated( this.instance, null, options );
|
|
}, this );
|
|
|
|
var dit = this;
|
|
!options.silent && Backbone.Relational.eventQueue.add( function() {
|
|
dit.instance.trigger( 'remove:' + dit.key, model, dit.related, options );
|
|
});
|
|
},
|
|
|
|
handleReset: function( coll, options ) {
|
|
var dit = this;
|
|
options = options ? _.clone( options ) : {};
|
|
!options.silent && Backbone.Relational.eventQueue.add( function() {
|
|
dit.instance.trigger( 'reset:' + dit.key, dit.related, options );
|
|
});
|
|
},
|
|
|
|
tryAddRelated: function( model, coll, options ) {
|
|
var item = _.contains( this.keyIds, model.id );
|
|
|
|
if ( item ) {
|
|
this.addRelated( model, options );
|
|
this.keyIds = _.without( this.keyIds, model.id );
|
|
}
|
|
},
|
|
|
|
addRelated: function( model, options ) {
|
|
// Allow 'model' to set up its relations before proceeding.
|
|
// (which can result in a call to 'addRelated' from a relation of 'model')
|
|
var dit = this;
|
|
model.queue( function() {
|
|
if ( dit.related && !dit.related.get( model ) ) {
|
|
dit.related.add( model, _.defaults( { parse: false }, options ) );
|
|
}
|
|
});
|
|
},
|
|
|
|
removeRelated: function( model, coll, options ) {
|
|
if ( this.related.get( model ) ) {
|
|
this.related.remove( model, options );
|
|
}
|
|
}
|
|
});
|
|
|
|
/**
|
|
* A type of Backbone.Model that also maintains relations to other models and collections.
|
|
* New events when compared to the original:
|
|
* - 'add:<key>' (model, related collection, options)
|
|
* - 'remove:<key>' (model, related collection, options)
|
|
* - 'change:<key>' (model, related model or collection, options)
|
|
*/
|
|
Backbone.RelationalModel = Backbone.Model.extend({
|
|
relations: null, // Relation descriptions on the prototype
|
|
_relations: null, // Relation instances
|
|
_isInitialized: false,
|
|
_deferProcessing: false,
|
|
_queue: null,
|
|
|
|
subModelTypeAttribute: 'type',
|
|
subModelTypes: null,
|
|
|
|
constructor: function( attributes, options ) {
|
|
// Nasty hack, for cases like 'model.get( <HasMany key> ).add( item )'.
|
|
// Defer 'processQueue', so that when 'Relation.createModels' is used we trigger 'HasMany'
|
|
// collection events only after the model is really fully set up.
|
|
// Example: event for "p.on( 'add:jobs' )" -> "p.get('jobs').add( { company: c.id, person: p.id } )".
|
|
if ( options && options.collection ) {
|
|
var dit = this,
|
|
collection = this.collection = options.collection;
|
|
|
|
// Prevent `collection` from cascading down to nested models; they shouldn't go into this `if` clause.
|
|
delete options.collection;
|
|
|
|
this._deferProcessing = true;
|
|
|
|
var processQueue = function( model ) {
|
|
if ( model === dit ) {
|
|
dit._deferProcessing = false;
|
|
dit.processQueue();
|
|
collection.off( 'relational:add', processQueue );
|
|
}
|
|
};
|
|
collection.on( 'relational:add', processQueue );
|
|
|
|
// So we do process the queue eventually, regardless of whether this model actually gets added to 'options.collection'.
|
|
_.defer( function() {
|
|
processQueue( dit );
|
|
});
|
|
}
|
|
|
|
Backbone.Relational.store.processOrphanRelations();
|
|
|
|
this._queue = new Backbone.BlockingQueue();
|
|
this._queue.block();
|
|
Backbone.Relational.eventQueue.block();
|
|
|
|
try {
|
|
Backbone.Model.apply( this, arguments );
|
|
}
|
|
finally {
|
|
// Try to run the global queue holding external events
|
|
Backbone.Relational.eventQueue.unblock();
|
|
}
|
|
},
|
|
|
|
/**
|
|
* Override 'trigger' to queue 'change' and 'change:*' events
|
|
*/
|
|
trigger: function( eventName ) {
|
|
if ( eventName.length > 5 && eventName.indexOf( 'change' ) === 0 ) {
|
|
var dit = this,
|
|
args = arguments;
|
|
|
|
Backbone.Relational.eventQueue.add( function() {
|
|
if ( !dit._isInitialized ) {
|
|
return;
|
|
}
|
|
|
|
// Determine if the `change` event is still valid, now that all relations are populated
|
|
var changed = true;
|
|
if ( eventName === 'change' ) {
|
|
changed = dit.hasChanged();
|
|
}
|
|
else {
|
|
var attr = eventName.slice( 7 ),
|
|
rel = dit.getRelation( attr );
|
|
|
|
if ( rel ) {
|
|
// If `attr` is a relation, `change:attr` get triggered from `Relation.onChange`.
|
|
// These take precedence over `change:attr` events triggered by `Model.set`.
|
|
// The relation set a fourth attribute to `true`. If this attribute is present,
|
|
// continue triggering this event; otherwise, it's from `Model.set` and should be stopped.
|
|
changed = ( args[ 4 ] === true );
|
|
|
|
// If this event was triggered by a relation, set the right value in `this.changed`
|
|
// (a Collection or Model instead of raw data).
|
|
if ( changed ) {
|
|
dit.changed[ attr ] = args[ 2 ];
|
|
}
|
|
// Otherwise, this event is from `Model.set`. If the relation doesn't report a change,
|
|
// remove attr from `dit.changed` so `hasChanged` doesn't take it into account.
|
|
else if ( !rel.changed ) {
|
|
delete dit.changed[ attr ];
|
|
}
|
|
}
|
|
}
|
|
|
|
changed && Backbone.Model.prototype.trigger.apply( dit, args );
|
|
});
|
|
}
|
|
else {
|
|
Backbone.Model.prototype.trigger.apply( this, arguments );
|
|
}
|
|
|
|
return this;
|
|
},
|
|
|
|
/**
|
|
* Initialize Relations present in this.relations; determine the type (HasOne/HasMany), then creates a new instance.
|
|
* Invoked in the first call so 'set' (which is made from the Backbone.Model constructor).
|
|
*/
|
|
initializeRelations: function( options ) {
|
|
this.acquire(); // Setting up relations often also involve calls to 'set', and we only want to enter this function once
|
|
this._relations = {};
|
|
|
|
_.each( this.relations || [], function( rel ) {
|
|
Backbone.Relational.store.initializeRelation( this, rel, options );
|
|
}, this );
|
|
|
|
this._isInitialized = true;
|
|
this.release();
|
|
this.processQueue();
|
|
},
|
|
|
|
/**
|
|
* When new values are set, notify this model's relations (also if options.silent is set).
|
|
* (Relation.setRelated locks this model before calling 'set' on it to prevent loops)
|
|
*/
|
|
updateRelations: function( options ) {
|
|
if ( this._isInitialized && !this.isLocked() ) {
|
|
_.each( this._relations, function( rel ) {
|
|
// Update from data in `rel.keySource` if set, or `rel.key` otherwise
|
|
var val = this.attributes[ rel.keySource ] || this.attributes[ rel.key ];
|
|
if ( rel.related !== val ) {
|
|
this.trigger( 'relational:change:' + rel.key, this, val, options || {} );
|
|
}
|
|
}, this );
|
|
}
|
|
},
|
|
|
|
/**
|
|
* Either add to the queue (if we're not initialized yet), or execute right away.
|
|
*/
|
|
queue: function( func ) {
|
|
this._queue.add( func );
|
|
},
|
|
|
|
/**
|
|
* Process _queue
|
|
*/
|
|
processQueue: function() {
|
|
if ( this._isInitialized && !this._deferProcessing && this._queue.isBlocked() ) {
|
|
this._queue.unblock();
|
|
}
|
|
},
|
|
|
|
/**
|
|
* Get a specific relation.
|
|
* @param key {string} The relation key to look for.
|
|
* @return {Backbone.Relation} An instance of 'Backbone.Relation', if a relation was found for 'key', or null.
|
|
*/
|
|
getRelation: function( key ) {
|
|
return this._relations[ key ];
|
|
},
|
|
|
|
/**
|
|
* Get all of the created relations.
|
|
* @return {Backbone.Relation[]}
|
|
*/
|
|
getRelations: function() {
|
|
return _.values( this._relations );
|
|
},
|
|
|
|
/**
|
|
* Retrieve related objects.
|
|
* @param key {string} The relation key to fetch models for.
|
|
* @param [options] {Object} Options for 'Backbone.Model.fetch' and 'Backbone.sync'.
|
|
* @param [refresh=false] {boolean} Fetch existing models from the server as well (in order to update them).
|
|
* @return {jQuery.when[]} An array of request objects
|
|
*/
|
|
fetchRelated: function( key, options, refresh ) {
|
|
// Set default `options` for fetch
|
|
options = _.extend( { update: true, remove: false }, options );
|
|
|
|
var setUrl,
|
|
requests = [],
|
|
rel = this.getRelation( key ),
|
|
idsToFetch = rel && ( rel.keyIds || ( ( rel.keyId || rel.keyId === 0 ) ? [ rel.keyId ] : [] ) );
|
|
|
|
// On `refresh`, add the ids for current models in the relation to `idsToFetch`
|
|
if ( refresh ) {
|
|
var models = rel.related instanceof Backbone.Collection ? rel.related.models : [ rel.related ];
|
|
_.each( models, function( model ) {
|
|
if ( model.id || model.id === 0 ) {
|
|
idsToFetch.push( model.id );
|
|
}
|
|
});
|
|
}
|
|
|
|
if ( idsToFetch && idsToFetch.length ) {
|
|
// Find (or create) a model for each one that is to be fetched
|
|
var created = [],
|
|
models = _.map( idsToFetch, function( id ) {
|
|
var model = Backbone.Relational.store.find( rel.relatedModel, id );
|
|
|
|
if ( !model ) {
|
|
var attrs = {};
|
|
attrs[ rel.relatedModel.prototype.idAttribute ] = id;
|
|
model = rel.relatedModel.findOrCreate( attrs, options );
|
|
created.push( model );
|
|
}
|
|
|
|
return model;
|
|
}, this );
|
|
|
|
// Try if the 'collection' can provide a url to fetch a set of models in one request.
|
|
if ( rel.related instanceof Backbone.Collection && _.isFunction( rel.related.url ) ) {
|
|
setUrl = rel.related.url( models );
|
|
}
|
|
|
|
// An assumption is that when 'Backbone.Collection.url' is a function, it can handle building of set urls.
|
|
// To make sure it can, test if the url we got by supplying a list of models to fetch is different from
|
|
// the one supplied for the default fetch action (without args to 'url').
|
|
if ( setUrl && setUrl !== rel.related.url() ) {
|
|
var opts = _.defaults(
|
|
{
|
|
error: function() {
|
|
var args = arguments;
|
|
_.each( created, function( model ) {
|
|
model.trigger( 'destroy', model, model.collection, options );
|
|
options.error && options.error.apply( model, args );
|
|
});
|
|
},
|
|
url: setUrl
|
|
},
|
|
options
|
|
);
|
|
|
|
requests = [ rel.related.fetch( opts ) ];
|
|
}
|
|
else {
|
|
requests = _.map( models, function( model ) {
|
|
var opts = _.defaults(
|
|
{
|
|
error: function() {
|
|
if ( _.contains( created, model ) ) {
|
|
model.trigger( 'destroy', model, model.collection, options );
|
|
options.error && options.error.apply( model, arguments );
|
|
}
|
|
}
|
|
},
|
|
options
|
|
);
|
|
return model.fetch( opts );
|
|
}, this );
|
|
}
|
|
}
|
|
|
|
return requests;
|
|
},
|
|
|
|
get: function( attr ) {
|
|
var originalResult = Backbone.Model.prototype.get.call( this, attr );
|
|
|
|
// Use `originalResult` get if dotNotation not enabled or not required because no dot is in `attr`
|
|
if ( !this.dotNotation || attr.indexOf( '.' ) === -1 ) {
|
|
return originalResult;
|
|
}
|
|
|
|
// Go through all splits and return the final result
|
|
var splits = attr.split( '.' );
|
|
var result = _.reduce(splits, function( model, split ) {
|
|
if ( !( model instanceof Backbone.Model ) ) {
|
|
throw new Error( 'Attribute must be an instanceof Backbone.Model. Is: ' + model + ', currentSplit: ' + split );
|
|
}
|
|
|
|
return Backbone.Model.prototype.get.call( model, split );
|
|
}, this );
|
|
|
|
if ( originalResult !== undefined && result !== undefined ) {
|
|
throw new Error( "Ambiguous result for '" + attr + "'. direct result: " + originalResult + ", dotNotation: " + result );
|
|
}
|
|
|
|
return originalResult || result;
|
|
},
|
|
|
|
set: function( key, value, options ) {
|
|
Backbone.Relational.eventQueue.block();
|
|
|
|
// Duplicate backbone's behavior to allow separate key/value parameters, instead of a single 'attributes' object
|
|
var attributes;
|
|
if ( _.isObject( key ) || key == null ) {
|
|
attributes = key;
|
|
options = value;
|
|
}
|
|
else {
|
|
attributes = {};
|
|
attributes[ key ] = value;
|
|
}
|
|
|
|
try {
|
|
var id = this.id,
|
|
newId = attributes && this.idAttribute in attributes && attributes[ this.idAttribute ];
|
|
|
|
// Check if we're not setting a duplicate id before actually calling `set`.
|
|
Backbone.Relational.store.checkId( this, newId );
|
|
|
|
var result = Backbone.Model.prototype.set.apply( this, arguments );
|
|
|
|
// Ideal place to set up relations, if this is the first time we're here for this model
|
|
if ( !this._isInitialized && !this.isLocked() ) {
|
|
this.constructor.initializeModelHierarchy();
|
|
Backbone.Relational.store.register( this );
|
|
this.initializeRelations( options );
|
|
}
|
|
// The store should know about an `id` update asap
|
|
else if ( newId && newId !== id ) {
|
|
Backbone.Relational.store.update( this );
|
|
}
|
|
|
|
if ( attributes ) {
|
|
this.updateRelations( options );
|
|
}
|
|
}
|
|
finally {
|
|
// Try to run the global queue holding external events
|
|
Backbone.Relational.eventQueue.unblock();
|
|
}
|
|
|
|
return result;
|
|
},
|
|
|
|
unset: function( attribute, options ) {
|
|
Backbone.Relational.eventQueue.block();
|
|
|
|
var result = Backbone.Model.prototype.unset.apply( this, arguments );
|
|
this.updateRelations( options );
|
|
|
|
// Try to run the global queue holding external events
|
|
Backbone.Relational.eventQueue.unblock();
|
|
|
|
return result;
|
|
},
|
|
|
|
clear: function( options ) {
|
|
Backbone.Relational.eventQueue.block();
|
|
|
|
var result = Backbone.Model.prototype.clear.apply( this, arguments );
|
|
this.updateRelations( options );
|
|
|
|
// Try to run the global queue holding external events
|
|
Backbone.Relational.eventQueue.unblock();
|
|
|
|
return result;
|
|
},
|
|
|
|
clone: function() {
|
|
var attributes = _.clone( this.attributes );
|
|
if ( !_.isUndefined( attributes[ this.idAttribute ] ) ) {
|
|
attributes[ this.idAttribute ] = null;
|
|
}
|
|
|
|
_.each( this.getRelations(), function( rel ) {
|
|
delete attributes[ rel.key ];
|
|
});
|
|
|
|
return new this.constructor( attributes );
|
|
},
|
|
|
|
/**
|
|
* Convert relations to JSON, omits them when required
|
|
*/
|
|
toJSON: function( options ) {
|
|
// If this Model has already been fully serialized in this branch once, return to avoid loops
|
|
if ( this.isLocked() ) {
|
|
return this.id;
|
|
}
|
|
|
|
this.acquire();
|
|
var json = Backbone.Model.prototype.toJSON.call( this, options );
|
|
|
|
if ( this.constructor._superModel && !( this.constructor._subModelTypeAttribute in json ) ) {
|
|
json[ this.constructor._subModelTypeAttribute ] = this.constructor._subModelTypeValue;
|
|
}
|
|
|
|
_.each( this._relations, function( rel ) {
|
|
var related = json[ rel.key ],
|
|
includeInJSON = rel.options.includeInJSON,
|
|
value = null;
|
|
|
|
if ( includeInJSON === true ) {
|
|
if ( related && _.isFunction( related.toJSON ) ) {
|
|
value = related.toJSON( options );
|
|
}
|
|
}
|
|
else if ( _.isString( includeInJSON ) ) {
|
|
if ( related instanceof Backbone.Collection ) {
|
|
value = related.pluck( includeInJSON );
|
|
}
|
|
else if ( related instanceof Backbone.Model ) {
|
|
value = related.get( includeInJSON );
|
|
}
|
|
|
|
// Add ids for 'unfound' models if includeInJSON is equal to (only) the relatedModel's `idAttribute`
|
|
if ( includeInJSON === rel.relatedModel.prototype.idAttribute ) {
|
|
if ( rel instanceof Backbone.HasMany ) {
|
|
value = value.concat( rel.keyIds );
|
|
}
|
|
else if ( rel instanceof Backbone.HasOne ) {
|
|
value = value || rel.keyId;
|
|
}
|
|
}
|
|
}
|
|
else if ( _.isArray( includeInJSON ) ) {
|
|
if ( related instanceof Backbone.Collection ) {
|
|
value = [];
|
|
related.each( function( model ) {
|
|
var curJson = {};
|
|
_.each( includeInJSON, function( key ) {
|
|
curJson[ key ] = model.get( key );
|
|
});
|
|
value.push( curJson );
|
|
});
|
|
}
|
|
else if ( related instanceof Backbone.Model ) {
|
|
value = {};
|
|
_.each( includeInJSON, function( key ) {
|
|
value[ key ] = related.get( key );
|
|
});
|
|
}
|
|
}
|
|
else {
|
|
delete json[ rel.key ];
|
|
}
|
|
|
|
if ( includeInJSON ) {
|
|
json[ rel.keyDestination ] = value;
|
|
}
|
|
|
|
if ( rel.keyDestination !== rel.key ) {
|
|
delete json[ rel.key ];
|
|
}
|
|
});
|
|
|
|
this.release();
|
|
return json;
|
|
}
|
|
},
|
|
{
|
|
/**
|
|
*
|
|
* @param superModel
|
|
* @returns {Backbone.RelationalModel.constructor}
|
|
*/
|
|
setup: function( superModel ) {
|
|
// We don't want to share a relations array with a parent, as this will cause problems with
|
|
// reverse relations.
|
|
this.prototype.relations = ( this.prototype.relations || [] ).slice( 0 );
|
|
|
|
this._subModels = {};
|
|
this._superModel = null;
|
|
|
|
// If this model has 'subModelTypes' itself, remember them in the store
|
|
if ( this.prototype.hasOwnProperty( 'subModelTypes' ) ) {
|
|
Backbone.Relational.store.addSubModels( this.prototype.subModelTypes, this );
|
|
}
|
|
// The 'subModelTypes' property should not be inherited, so reset it.
|
|
else {
|
|
this.prototype.subModelTypes = null;
|
|
}
|
|
|
|
// Initialize all reverseRelations that belong to this new model.
|
|
_.each( this.prototype.relations || [], function( rel ) {
|
|
if ( !rel.model ) {
|
|
rel.model = this;
|
|
}
|
|
|
|
if ( rel.reverseRelation && rel.model === this ) {
|
|
var preInitialize = true;
|
|
if ( _.isString( rel.relatedModel ) ) {
|
|
/**
|
|
* The related model might not be defined for two reasons
|
|
* 1. it is related to itself
|
|
* 2. it never gets defined, e.g. a typo
|
|
* 3. the model hasn't been defined yet, but will be later
|
|
* In neither of these cases do we need to pre-initialize reverse relations.
|
|
* However, for 3. (which is, to us, indistinguishable from 2.), we do need to attempt
|
|
* setting up this relation again later, in case the related model is defined later.
|
|
*/
|
|
var relatedModel = Backbone.Relational.store.getObjectByName( rel.relatedModel );
|
|
preInitialize = relatedModel && ( relatedModel.prototype instanceof Backbone.RelationalModel );
|
|
}
|
|
|
|
if ( preInitialize ) {
|
|
Backbone.Relational.store.initializeRelation( null, rel );
|
|
}
|
|
else if ( _.isString( rel.relatedModel ) ) {
|
|
Backbone.Relational.store.addOrphanRelation( rel );
|
|
}
|
|
}
|
|
}, this );
|
|
|
|
return this;
|
|
},
|
|
|
|
/**
|
|
* Create a 'Backbone.Model' instance based on 'attributes'.
|
|
* @param {Object} attributes
|
|
* @param {Object} [options]
|
|
* @return {Backbone.Model}
|
|
*/
|
|
build: function( attributes, options ) {
|
|
var model = this;
|
|
|
|
// 'build' is a possible entrypoint; it's possible no model hierarchy has been determined yet.
|
|
this.initializeModelHierarchy();
|
|
|
|
// Determine what type of (sub)model should be built if applicable.
|
|
// Lookup the proper subModelType in 'this._subModels'.
|
|
if ( this._subModels && this.prototype.subModelTypeAttribute in attributes ) {
|
|
var subModelTypeAttribute = attributes[ this.prototype.subModelTypeAttribute ];
|
|
var subModelType = this._subModels[ subModelTypeAttribute ];
|
|
if ( subModelType ) {
|
|
model = subModelType;
|
|
}
|
|
}
|
|
|
|
return new model( attributes, options );
|
|
},
|
|
|
|
/**
|
|
*
|
|
*/
|
|
initializeModelHierarchy: function() {
|
|
// If we're here for the first time, try to determine if this modelType has a 'superModel'.
|
|
if ( _.isUndefined( this._superModel ) || _.isNull( this._superModel ) ) {
|
|
Backbone.Relational.store.setupSuperModel( this );
|
|
|
|
// If a superModel has been found, copy relations from the _superModel if they haven't been
|
|
// inherited automatically (due to a redefinition of 'relations').
|
|
// Otherwise, make sure we don't get here again for this type by making '_superModel' false so we fail
|
|
// the isUndefined/isNull check next time.
|
|
if ( this._superModel && this._superModel.prototype.relations ) {
|
|
// Find relations that exist on the `_superModel`, but not yet on this model.
|
|
var inheritedRelations = _.select( this._superModel.prototype.relations || [], function( superRel ) {
|
|
return !_.any( this.prototype.relations || [], function( rel ) {
|
|
return superRel.relatedModel === rel.relatedModel && superRel.key === rel.key;
|
|
}, this );
|
|
}, this );
|
|
|
|
this.prototype.relations = inheritedRelations.concat( this.prototype.relations );
|
|
}
|
|
else {
|
|
this._superModel = false;
|
|
}
|
|
}
|
|
|
|
// If we came here through 'build' for a model that has 'subModelTypes', and not all of them have been resolved yet, try to resolve each.
|
|
if ( this.prototype.subModelTypes && _.keys( this.prototype.subModelTypes ).length !== _.keys( this._subModels ).length ) {
|
|
_.each( this.prototype.subModelTypes || [], function( subModelTypeName ) {
|
|
var subModelType = Backbone.Relational.store.getObjectByName( subModelTypeName );
|
|
subModelType && subModelType.initializeModelHierarchy();
|
|
});
|
|
}
|
|
},
|
|
|
|
/**
|
|
* Find an instance of `this` type in 'Backbone.Relational.store'.
|
|
* - If `attributes` is a string or a number, `findOrCreate` will just query the `store` and return a model if found.
|
|
* - If `attributes` is an object and is found in the store, the model will be updated with `attributes` unless `options.update` is `false`.
|
|
* Otherwise, a new model is created with `attributes` (unless `options.create` is explicitly set to `false`).
|
|
* @param {Object|String|Number} attributes Either a model's id, or the attributes used to create or update a model.
|
|
* @param {Object} [options]
|
|
* @param {Boolean} [options.create=true]
|
|
* @param {Boolean} [options.merge=true]
|
|
* @param {Boolean} [options.parse=false]
|
|
* @return {Backbone.RelationalModel}
|
|
*/
|
|
findOrCreate: function( attributes, options ) {
|
|
options || ( options = {} );
|
|
var parsedAttributes = ( _.isObject( attributes ) && options.parse && this.prototype.parse ) ?
|
|
this.prototype.parse( attributes ) : attributes;
|
|
|
|
// Try to find an instance of 'this' model type in the store
|
|
var model = Backbone.Relational.store.find( this, parsedAttributes );
|
|
|
|
// If we found an instance, update it with the data in 'item' (unless 'options.merge' is false).
|
|
// If not, create an instance (unless 'options.create' is false).
|
|
if ( _.isObject( attributes ) ) {
|
|
if ( model && options.merge !== false ) {
|
|
// Make sure `options.collection` doesn't cascade to nested models
|
|
delete options.collection;
|
|
|
|
model.set( parsedAttributes, options );
|
|
}
|
|
else if ( !model && options.create !== false ) {
|
|
model = this.build( attributes, options );
|
|
}
|
|
}
|
|
|
|
return model;
|
|
}
|
|
});
|
|
_.extend( Backbone.RelationalModel.prototype, Backbone.Semaphore );
|
|
|
|
/**
|
|
* Override Backbone.Collection._prepareModel, so objects will be built using the correct type
|
|
* if the collection.model has subModels.
|
|
* Attempts to find a model for `attrs` in Backbone.store through `findOrCreate`
|
|
* (which sets the new properties on it if found), or instantiates a new model.
|
|
*/
|
|
Backbone.Collection.prototype.__prepareModel = Backbone.Collection.prototype._prepareModel;
|
|
Backbone.Collection.prototype._prepareModel = function ( attrs, options ) {
|
|
var model;
|
|
|
|
if ( attrs instanceof Backbone.Model ) {
|
|
if ( !attrs.collection ) {
|
|
attrs.collection = this;
|
|
}
|
|
model = attrs;
|
|
}
|
|
else {
|
|
options || ( options = {} );
|
|
options.collection = this;
|
|
|
|
if ( typeof this.model.findOrCreate !== 'undefined' ) {
|
|
model = this.model.findOrCreate( attrs, options );
|
|
}
|
|
else {
|
|
model = new this.model( attrs, options );
|
|
}
|
|
|
|
if ( model && model.isNew() && !model._validate( attrs, options ) ) {
|
|
this.trigger( 'invalid', this, attrs, options );
|
|
model = false;
|
|
}
|
|
}
|
|
|
|
return model;
|
|
};
|
|
|
|
|
|
/**
|
|
* Override Backbone.Collection.set, so we'll create objects from attributes where required,
|
|
* and update the existing models. Also, trigger 'relational:add'.
|
|
*/
|
|
var set = Backbone.Collection.prototype.__set = Backbone.Collection.prototype.set;
|
|
Backbone.Collection.prototype.set = function( models, options ) {
|
|
// Short-circuit if this Collection doesn't hold RelationalModels
|
|
if ( !( this.model.prototype instanceof Backbone.RelationalModel ) ) {
|
|
return set.apply( this, arguments );
|
|
}
|
|
|
|
if ( options && options.parse ) {
|
|
models = this.parse( models, options );
|
|
}
|
|
|
|
if ( !_.isArray( models ) ) {
|
|
models = models ? [ models ] : [];
|
|
}
|
|
|
|
var newModels = [],
|
|
toAdd = [];
|
|
|
|
//console.debug( 'calling add on coll=%o; model=%o, options=%o', this, models, options );
|
|
_.each( models, function( model ) {
|
|
if ( !( model instanceof Backbone.Model ) ) {
|
|
model = Backbone.Collection.prototype._prepareModel.call( this, model, options );
|
|
}
|
|
|
|
if ( model ) {
|
|
toAdd.push( model );
|
|
|
|
if ( !( this.get( model ) || this.get( model.cid ) ) ) {
|
|
newModels.push( model );
|
|
}
|
|
// If we arrive in `add` while performing a `set` (after a create, so the model gains an `id`),
|
|
// we may get here before `_onModelEvent` has had the chance to update `_byId`.
|
|
else if ( model.id != null ) {
|
|
this._byId[ model.id ] = model;
|
|
}
|
|
}
|
|
}, this );
|
|
|
|
// Add 'models' in a single batch, so the original add will only be called once (and thus 'sort', etc).
|
|
// If `parse` was specified, the collection and contained models have been parsed now.
|
|
set.call( this, toAdd, _.defaults( { parse: false }, options ) );
|
|
|
|
_.each( newModels, function( model ) {
|
|
// Fire a `relational:add` event for any model in `newModels` that has actually been added to the collection.
|
|
if ( this.get( model ) || this.get( model.cid ) ) {
|
|
this.trigger( 'relational:add', model, this, options );
|
|
}
|
|
}, this );
|
|
|
|
return this;
|
|
};
|
|
|
|
/**
|
|
* Override 'Backbone.Collection.remove' to trigger 'relational:remove'.
|
|
*/
|
|
var remove = Backbone.Collection.prototype.__remove = Backbone.Collection.prototype.remove;
|
|
Backbone.Collection.prototype.remove = function( models, options ) {
|
|
// Short-circuit if this Collection doesn't hold RelationalModels
|
|
if ( !( this.model.prototype instanceof Backbone.RelationalModel ) ) {
|
|
return remove.apply( this, arguments );
|
|
}
|
|
|
|
models = _.isArray( models ) ? models.slice() : [ models ];
|
|
options || ( options = {} );
|
|
|
|
var toRemove = [];
|
|
|
|
//console.debug('calling remove on coll=%o; models=%o, options=%o', this, models, options );
|
|
_.each( models, function( model ) {
|
|
model = this.get( model ) || this.get( model.cid );
|
|
model && toRemove.push( model );
|
|
}, this );
|
|
|
|
if ( toRemove.length ) {
|
|
remove.call( this, toRemove, options );
|
|
|
|
_.each( toRemove, function( model ) {
|
|
this.trigger('relational:remove', model, this, options);
|
|
}, this );
|
|
}
|
|
|
|
return this;
|
|
};
|
|
|
|
/**
|
|
* Override 'Backbone.Collection.reset' to trigger 'relational:reset'.
|
|
*/
|
|
var reset = Backbone.Collection.prototype.__reset = Backbone.Collection.prototype.reset;
|
|
Backbone.Collection.prototype.reset = function( models, options ) {
|
|
options = _.extend( { merge: true }, options );
|
|
reset.call( this, models, options );
|
|
|
|
if ( this.model.prototype instanceof Backbone.RelationalModel ) {
|
|
this.trigger( 'relational:reset', this, options );
|
|
}
|
|
|
|
return this;
|
|
};
|
|
|
|
/**
|
|
* Override 'Backbone.Collection.sort' to trigger 'relational:reset'.
|
|
*/
|
|
var sort = Backbone.Collection.prototype.__sort = Backbone.Collection.prototype.sort;
|
|
Backbone.Collection.prototype.sort = function( options ) {
|
|
sort.call( this, options );
|
|
|
|
if ( this.model.prototype instanceof Backbone.RelationalModel ) {
|
|
this.trigger( 'relational:reset', this, options );
|
|
}
|
|
|
|
return this;
|
|
};
|
|
|
|
/**
|
|
* Override 'Backbone.Collection.trigger' so 'add', 'remove' and 'reset' events are queued until relations
|
|
* are ready.
|
|
*/
|
|
var trigger = Backbone.Collection.prototype.__trigger = Backbone.Collection.prototype.trigger;
|
|
Backbone.Collection.prototype.trigger = function( eventName ) {
|
|
// Short-circuit if this Collection doesn't hold RelationalModels
|
|
if ( !( this.model.prototype instanceof Backbone.RelationalModel ) ) {
|
|
return trigger.apply( this, arguments );
|
|
}
|
|
|
|
if ( eventName === 'add' || eventName === 'remove' || eventName === 'reset' ) {
|
|
var dit = this,
|
|
args = arguments;
|
|
|
|
if ( _.isObject( args[ 3 ] ) ) {
|
|
args = _.toArray( args );
|
|
// the fourth argument is the option object.
|
|
// we need to clone it, as it could be modified while we wait on the eventQueue to be unblocked
|
|
args[ 3 ] = _.clone( args[ 3 ] );
|
|
}
|
|
|
|
Backbone.Relational.eventQueue.add( function() {
|
|
trigger.apply( dit, args );
|
|
});
|
|
}
|
|
else {
|
|
trigger.apply( this, arguments );
|
|
}
|
|
|
|
return this;
|
|
};
|
|
|
|
// Override .extend() to automatically call .setup()
|
|
Backbone.RelationalModel.extend = function( protoProps, classProps ) {
|
|
var child = Backbone.Model.extend.apply( this, arguments );
|
|
|
|
child.setup( this );
|
|
|
|
return child;
|
|
};
|
|
})();
|