kopia lustrzana https://dev.funkwhale.audio/funkwhale/funkwhale
251 wiersze
8.8 KiB
Python
251 wiersze
8.8 KiB
Python
from django.db import models, transaction
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from django.db.models import Q
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from django.db.models.expressions import OuterRef, Subquery
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from django.utils import timezone
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from rest_framework import exceptions
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from funkwhale_api.common import fields, preferences
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from funkwhale_api.music import models as music_models
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class PlaylistQuerySet(models.QuerySet):
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def with_tracks_count(self):
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return self.annotate(_tracks_count=models.Count("playlist_tracks"))
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def with_duration(self):
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subquery = Subquery(
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music_models.Upload.objects.filter(
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track_id=OuterRef("playlist_tracks__track__id")
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)
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.order_by("id")
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.values("id")[:1]
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)
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return self.annotate(
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duration=models.Sum(
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"playlist_tracks__track__uploads__duration",
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filter=Q(playlist_tracks__track__uploads=subquery),
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)
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)
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def with_covers(self):
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album_prefetch = models.Prefetch(
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"album",
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queryset=music_models.Album.objects.select_related("attachment_cover"),
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)
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track_prefetch = models.Prefetch(
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"track",
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queryset=music_models.Track.objects.prefetch_related(album_prefetch).only(
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"id", "album_id"
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),
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)
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plt_prefetch = models.Prefetch(
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"playlist_tracks",
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queryset=PlaylistTrack.objects.all()
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.exclude(track__album__attachment_cover=None)
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.order_by("index")
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.only("id", "playlist_id", "track_id")
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.prefetch_related(track_prefetch),
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to_attr="plts_for_cover",
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)
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return self.prefetch_related(plt_prefetch)
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def with_playable_plts(self, actor):
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return self.prefetch_related(
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models.Prefetch(
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"playlist_tracks",
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queryset=PlaylistTrack.objects.playable_by(actor),
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to_attr="playable_plts",
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)
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)
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def playable_by(self, actor, include=True):
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plts = PlaylistTrack.objects.playable_by(actor, include)
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if include:
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return self.filter(playlist_tracks__in=plts).distinct()
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else:
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return self.exclude(playlist_tracks__in=plts).distinct()
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class Playlist(models.Model):
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name = models.CharField(max_length=50)
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user = models.ForeignKey(
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"users.User", related_name="playlists", on_delete=models.CASCADE
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)
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creation_date = models.DateTimeField(default=timezone.now)
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modification_date = models.DateTimeField(auto_now=True)
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privacy_level = fields.get_privacy_field()
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objects = PlaylistQuerySet.as_manager()
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def __str__(self):
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return self.name
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def get_absolute_url(self):
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return f"/library/playlists/{self.pk}"
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@transaction.atomic
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def insert(self, plt, index=None, allow_duplicates=True):
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"""
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Given a PlaylistTrack, insert it at the correct index in the playlist,
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and update other tracks index if necessary.
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"""
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old_index = plt.index
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move = old_index is not None
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if index is not None and index == old_index:
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# moving at same position, just skip
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return index
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existing = self.playlist_tracks.select_for_update()
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if move:
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existing = existing.exclude(pk=plt.pk)
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total = existing.filter(index__isnull=False).count()
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if index is None:
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# we simply increment the last track index by 1
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index = total
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if index > total:
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raise exceptions.ValidationError("Index is not continuous")
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if index < 0:
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raise exceptions.ValidationError("Index must be zero or positive")
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if not allow_duplicates:
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existing_without_current_plt = existing.exclude(pk=plt.pk)
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self._check_duplicate_add(existing_without_current_plt, [plt.track])
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if move:
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# we remove the index temporarily, to avoid integrity errors
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plt.index = None
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plt.save(update_fields=["index"])
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if index > old_index:
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# new index is higher than current, we decrement previous tracks
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to_update = existing.filter(index__gt=old_index, index__lte=index)
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to_update.update(index=models.F("index") - 1)
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if index < old_index:
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# new index is lower than current, we increment next tracks
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to_update = existing.filter(index__lt=old_index, index__gte=index)
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to_update.update(index=models.F("index") + 1)
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else:
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to_update = existing.filter(index__gte=index)
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to_update.update(index=models.F("index") + 1)
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plt.index = index
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plt.save(update_fields=["index"])
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self.save(update_fields=["modification_date"])
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return index
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@transaction.atomic
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def remove(self, index):
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existing = self.playlist_tracks.select_for_update()
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self.save(update_fields=["modification_date"])
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to_update = existing.filter(index__gt=index)
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return to_update.update(index=models.F("index") - 1)
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@transaction.atomic
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def insert_many(self, tracks, allow_duplicates=True):
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existing = self.playlist_tracks.select_for_update()
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now = timezone.now()
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total = existing.filter(index__isnull=False).count()
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max_tracks = preferences.get("playlists__max_tracks")
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if existing.count() + len(tracks) > max_tracks:
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raise exceptions.ValidationError(
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f"Playlist would reach the maximum of {max_tracks} tracks"
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)
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if not allow_duplicates:
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self._check_duplicate_add(existing, tracks)
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self.save(update_fields=["modification_date"])
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start = total
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plts = [
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PlaylistTrack(
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creation_date=now, playlist=self, track=track, index=start + i
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)
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for i, track in enumerate(tracks)
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]
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return PlaylistTrack.objects.bulk_create(plts)
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def _check_duplicate_add(self, existing_playlist_tracks, tracks_to_add):
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track_ids = [t.pk for t in tracks_to_add]
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duplicates = existing_playlist_tracks.filter(
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track__pk__in=track_ids
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).values_list("track__pk", flat=True)
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if duplicates:
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duplicate_tracks = [t for t in tracks_to_add if t.pk in duplicates]
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raise exceptions.ValidationError(
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{
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"non_field_errors": [
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{
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"tracks": duplicate_tracks,
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"playlist_name": self.name,
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"code": "tracks_already_exist_in_playlist",
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}
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]
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}
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)
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class PlaylistTrackQuerySet(models.QuerySet):
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def for_nested_serialization(self, actor=None):
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tracks = music_models.Track.objects.with_playable_uploads(actor)
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tracks = tracks.select_related(
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"artist", "album__artist", "album__attachment_cover", "attributed_to"
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)
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return self.prefetch_related(
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models.Prefetch("track", queryset=tracks, to_attr="_prefetched_track")
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)
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def annotate_playable_by_actor(self, actor):
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tracks = (
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music_models.Upload.objects.playable_by(actor)
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.filter(track__pk=models.OuterRef("track"))
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.order_by("id")
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.values("id")[:1]
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)
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subquery = models.Subquery(tracks)
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return self.annotate(is_playable_by_actor=subquery)
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def playable_by(self, actor, include=True):
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tracks = music_models.Track.objects.playable_by(actor, include)
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if include:
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return self.filter(track__pk__in=tracks).distinct()
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else:
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return self.exclude(track__pk__in=tracks).distinct()
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def by_index(self, index):
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plts = self.order_by("index").values_list("id", flat=True)
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try:
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plt_id = plts[index]
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except IndexError:
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raise PlaylistTrack.DoesNotExist
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return PlaylistTrack.objects.get(pk=plt_id)
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class PlaylistTrack(models.Model):
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track = models.ForeignKey(
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"music.Track", related_name="playlist_tracks", on_delete=models.CASCADE
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)
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index = models.PositiveIntegerField(null=True, blank=True)
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playlist = models.ForeignKey(
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Playlist, related_name="playlist_tracks", on_delete=models.CASCADE
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)
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creation_date = models.DateTimeField(default=timezone.now)
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objects = PlaylistTrackQuerySet.as_manager()
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class Meta:
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ordering = ("-playlist", "index")
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def delete(self, *args, **kwargs):
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playlist = self.playlist
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index = self.index
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update_indexes = kwargs.pop("update_indexes", False)
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r = super().delete(*args, **kwargs)
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if index is not None and update_indexes:
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playlist.remove(index)
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return r
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