使用Django，我有以下模型：
class Player(models.Model):
name = models.CharField(max_length=64)
description = models.CharField(max_length=128)
groupPlayer = models.ForeignKey(GroupPlayer)
class GroupPlayer(models.Model):
description = models.CharField(max_length=128)
name = models.CharField(max_length=32)
每个玩家都链接到一个组。某些群组没有玩家。我的目标是在Django中转换跟随查询（包括LEFT OUTER JOIN和Group by）：
select GroupPlayer.description, GroupPlayer.name, COUNT(Player.name) as gplayer
from (GroupPlayer LEFT OUTER JOIN Player ON GroupPlayer.id = Player.groupPlayer_id)
GROUP BY GroupPlayer.id
到目前为止，我已经创建了3个查询集，但无法将它们放在一起以获得所需的结果：
queryset_player = Player.objects.values('groupPlayer_id').annotate(total=Count('groupPlayer__id'))
queryset_group = GroupPlayer.objects.select_retated(queryset_player)
queryset_group2 = GroupPlayer.objects.all().prefetch_related('player_set')
任何人都可以为该左外联接提供帮助，分组并计数吗？
谢谢
from django.db.models import Count
groups = GroupPlayer.objects.annotate(num_players=Count('player'))
groups[0].num_players
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