30 lines
1.1 KiB
C#
30 lines
1.1 KiB
C#
using Mediator;
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using Microsoft.EntityFrameworkCore;
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using Musify.Application.Contracts;
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using Musify.Domain.ValueObjects;
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using Musify.Application.Genres.Responses;
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namespace Musify.Application.Genres;
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public record GetGenresQuery : IQuery<IReadOnlyList<GenreResponse>>;
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public class GetGenresQueryHandler(IDatabase database)
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: IQueryHandler<GetGenresQuery, IReadOnlyList<GenreResponse>>
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{
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public async ValueTask<IReadOnlyList<GenreResponse>> Handle(GetGenresQuery request, CancellationToken cancellationToken)
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{
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var rows = await database.TrackTags
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.AsNoTracking()
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.Where(tag => tag.Track.LifeCycleStatus == LifeCycleStatus.Active)
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.GroupBy(tag => tag.Tag)
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.Select(group => new { Genre = group.Key, TrackCount = group.Select(tag => tag.TrackId).Distinct().Count() })
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.ToListAsync(cancellationToken);
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return rows
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.OrderByDescending(row => row.TrackCount)
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.ThenBy(row => row.Genre)
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.Select(row => new GenreResponse(row.Genre, row.TrackCount))
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.ToList();
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}
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}
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