40 lines
1.3 KiB
C#
40 lines
1.3 KiB
C#
using Microsoft.EntityFrameworkCore;
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using Musify.Application.Contracts;
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using Musify.Application.Mixes.Responses;
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using Musify.Domain.Entities;
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namespace Musify.Application.Mixes;
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internal static class MixItemMapper
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{
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public static async Task<List<MixItemApplicationResponse>> ToResponsesAsync(
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IDatabase database,
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IReadOnlyList<MixItem> orderedItems,
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CancellationToken cancellationToken)
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{
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var trackIds = orderedItems.Select(item => item.TrackId).Distinct().ToList();
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var tracksById = await database.Tracks
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.AsNoTracking()
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.Include(track => track.Owner)
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.Where(track => trackIds.Contains(track.Id))
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.Select(track => new { Track = track, ListensCount = track.ListeningHistories.Count(l => l.IsCounted) })
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.ToDictionaryAsync(x => x.Track.Id, cancellationToken);
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return orderedItems
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.Where(item => tracksById.ContainsKey(item.TrackId))
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.Select(item =>
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{
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var entry = tracksById[item.TrackId];
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return new MixItemApplicationResponse(
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item.TrackId,
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entry.Track.Title,
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entry.Track.Owner.Name,
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entry.Track.DurationSeconds,
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entry.ListensCount);
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})
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.ToList();
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}
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}
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