Question

我有以下问题：

我的模型设置与以下场景类似

class Membership(models.Model):
    user = models.ForeignKey(User)
    verified = models.BooleanField()

class ClubMembership(Membership):
    club = models.ForeignKey(Club)

class ForumMembership(Membership):
    forum = models.ForeignKey(Forum)

class Club(models.Model):
    members = models.ManyToManyField(User, through='ClubMembership')

class Forum(models.Model):
    members = models.ManyToManyField(User, through='ForumMembership')

（我曾经将Membership作为抽象类，但这不会让我查询基类。）我现在想查询例如所有尚未针对特定用户进行验证的成员资格。我能做到

memberships = Membership.objects.filter(verified=False)

这给了我一个名为Verified = False的所有成员资格的列表。然而，我无法找到任何方法1）检查成员资格的子类和2）我无法访问“俱乐部”或“论坛”字段，即使我知道子类型。在我查询基类后，无论如何都要访问基类类型，我如何访问子类字段？

Answer 1

1）检查成员资格的哪个子类

您可以通过检查属性

来实现

if hasattr(membershipobj, 'clubmembership'):
   #its base for ClubMembership
elif hasattr(membershipobj, 'forummembership'): 
  #its for ForumMembership

2）我无法访问“俱乐部”或“论坛”字段

通过子对象访问子对象字段

membershipobj.clubmembership.club  
membershipobj.forummembership.forum

通过关键字在django多对多模型继承中查询父对象

1 个答案: