mobilizon/lib/graphql/schema/custom/uuid4.ex

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2020-01-26 19:34:25 +00:00
defmodule Mobilizon.GraphQL.Schema.Custom.UUID do
@moduledoc """
The UUID4 scalar type allows UUID compliant strings to be passed in and out.
Requires `{ :ecto, ">= 0.0.0" }` package: https://github.com/elixir-ecto/ecto
"""
use Absinthe.Schema.Notation
alias Ecto.UUID
scalar :uuid, name: "UUID" do
description("""
The `UUID` scalar type represents UUID4 compliant string data, represented as UTF-8
character sequences. The UUID4 type is most often used to represent unique
human-readable ID strings.
""")
serialize(&encode/1)
parse(&decode/1)
end
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@spec decode(Absinthe.Blueprint.Input.String.t()) :: {:ok, term} | :error
@spec decode(Absinthe.Blueprint.Input.Null.t()) :: {:ok, nil}
defp decode(%Absinthe.Blueprint.Input.String{value: value}) do
UUID.cast(value)
end
defp decode(%Absinthe.Blueprint.Input.Null{}) do
{:ok, nil}
end
defp decode(_) do
:error
end
defp encode(value), do: value
end