49 lines
2.0 KiB
C#
49 lines
2.0 KiB
C#
using ErrorOr;
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using Mediator;
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using Microsoft.EntityFrameworkCore;
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using Musify.Application.Contracts;
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using Musify.Application.Shared;
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using Musify.Application.Tracks.Responses;
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using X.PagedList;
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using X.PagedList.EF;
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namespace Musify.Application.Albums;
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public record GetAlbumTracksQuery(
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Guid AlbumId,
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int PageNumber,
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int PageSize)
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: IQuery<ErrorOr<PaginatedResponse<TrackApplicationResponse>>>;
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public class GetAlbumTracksQueryHandler(IDatabase database)
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: IQueryHandler<GetAlbumTracksQuery, ErrorOr<PaginatedResponse<TrackApplicationResponse>>>
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{
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public async ValueTask<ErrorOr<PaginatedResponse<TrackApplicationResponse>>> Handle(GetAlbumTracksQuery request, CancellationToken cancellationToken)
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{
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var albumExists = await database.Albums
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.AsNoTracking()
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.AnyAsync(album => album.Id == request.AlbumId, cancellationToken);
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if (!albumExists)
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return Error.NotFound();
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var tracksQuery = database.AlbumHasTracks
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.AsNoTracking()
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.Include(albumTrack => albumTrack.Track.Owner)
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.Include(albumTrack => albumTrack.Track.Tags)
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.Where(albumTrack => albumTrack.AlbumId == request.AlbumId);
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var totalCount = await tracksQuery.CountAsync(cancellationToken);
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var pagedEntities = await tracksQuery
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.OrderBy(albumTrack => albumTrack.TrackNumber)
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.Select(albumTrack => new { albumTrack.Track, ListensCount = albumTrack.Track.ListeningHistories.Count(l => l.IsCounted) })
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.ToPagedListAsync(request.PageNumber, request.PageSize, totalCount, cancellationToken);
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var pagedTracks = new StaticPagedList<TrackApplicationResponse>(
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pagedEntities.Select(entry => TrackApplicationResponse.FromEntity(entry.Track, entry.ListensCount)),
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pagedEntities.PageNumber, pagedEntities.PageSize, pagedEntities.TotalItemCount);
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return PaginatedResponse<TrackApplicationResponse>.FromPagedList(pagedTracks);
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}
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}
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