整个查询集我有以下型号:排除从结果
class LibraryEntry(models.Model):
player = models.ForeignKey(Player)
player_lib_song_id = models.IntegerField()
title = models.CharField(max_length=200)
artist = models.CharField(max_length=200)
album = models.CharField(max_length=200)
track = models.IntegerField()
genre = models.CharField(max_length=50)
duration = models.IntegerField()
is_deleted = models.BooleanField(default=False)
class Meta:
unique_together = ("player", "player_lib_song_id")
def __unicode__(self):
return "Library Entry " + str(self.player_lib_song_id) + ": " + self.title
class BannedSong(models.Model):
lib_entry = models.ForeignKey(LibraryEntry)
def __unicode__(self):
return "Banned Library Entry " + str(self.lib_entry.title)
我愿意做这样的查询:
banned_songs = BannedSong.objects.filter(lib_entry__player=activePlayer)
available_songs = LibraryEntry.objects.filter(player=activePlayer).exclude(banned_songs)
基本上如果一首歌曲被禁止,我想排除它来自我的可用歌曲集。有没有办法在Django中做到这一点?
你能不能让 'is_banned' 你LibraryEntry的模型的布尔字段? – jimw 2012-04-16 23:17:47
是的,但实际上禁止的歌曲数量与没有的歌曲数量相比实际上会被禁止。我想添加一个布尔型字段,大多数情况下只会是一个值是不好的形式。 – 2012-04-16 23:19:40
我不会这么说,但我认为这是一个品味问题。 – jimw 2012-04-16 23:21:05