Radarr/src/NzbDrone.Core/Validation/Paths/MovieAncestorValidator.cs

using System.Linq;
using FluentValidation.Validators;
using NzbDrone.Common.Extensions;
using NzbDrone.Core.Movies;

namespace NzbDrone.Core.Validation.Paths
{
    public class MovieAncestorValidator : PropertyValidator
    {
        private readonly IMovieService _movieService;

        public MovieAncestorValidator(IMovieService movieService)
            : base("Path is an ancestor of an existing movie")
        {
            _movieService = movieService;
        }

        protected override bool IsValid(PropertyValidatorContext context)
        {
            if (context.PropertyValue == null) return true;

            return !_movieService.GetAllMovies().Any(s => context.PropertyValue.ToString().IsParentPath(s.Path));
        }
    }
}