Django ManyRelatedManager 基于通过类的过滤
我有一个基于直通类的简单的多对多关系。
class Person(models.Model):
friends = models.ManyToManyField('self', through='Friendship')
class Friendship(models.Model):
me = models.ForeignKey(Person)
them = models.ForeignKey(Person)
confirmed = models.BooleanField(default=False)
简而言之，这应该允许某人将其他人添加为朋友，但在其他人确认之前链接不存在。够简单的。
我想向 Person 添加一个 is_friend(self, user) 方法。我想做一些类似的事情：
is_friend(self, user):
return self.friends.filter(them=user, confirmed=True).count()
但是 filter 似乎只对远程类（在本例中 Person）上进行操作。有什么方法可以在仍然使用 ManyRelatedManager 的同时过滤 Friendship 吗？
I have a simple many-to-many relationship based around a through class.
class Person(models.Model):
friends = models.ManyToManyField('self', through='Friendship')
class Friendship(models.Model):
me = models.ForeignKey(Person)
them = models.ForeignKey(Person)
confirmed = models.BooleanField(default=False)
This should, in short, allow somebody to add somebody else as a friend, but the link doesn't exist until the other person confirms it. Simple enough.
I want to add a is_friend(self, user) method to Person. In that I want to do something like:
is_friend(self, user):
return self.friends.filter(them=user, confirmed=True).count()
But filter only seems to operate on the distant class (in this case Person). Is there any way I can filter on Friendship instead while still using the ManyRelatedManager?
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我有点生疏了，但是你尝试过
return Friendship.objects.filter(me=self,them=user,confirmed=True)吗？I'm a bit rusty, but have you tried
return Friendship.objects.filter(me=self, them=user, confirmed=True)?你有没有尝试过：
Have you tried: