多对多字段引用自己 [英] ManyToMany Field Refere to Itself
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问题描述
如何制作我的模型以便其ManyToMany引用用户
How can make my model so that its ManyToMany Refer to User
class User(AbstractUser):
teacher_or_student = models.CharField(max_length=100)
mobile_number = models.CharField(max_length=100)
grade = models.CharField(max_length=100)
laptop_yes_or = models.CharField(max_length=100)
students = models.ManyToManyField(User)
推荐答案
为此传递'self'
字符串。默认情况下,一个指向自身的 ManyToManyField
是对称的 ,所以您可能想将其关闭,因为如果 a 是 b 的学生,那么 b 本身不是 a 的学生。您可以通过指定 symmetrical = False
[Django-doc] :
You can pass the 'self'
string for this. By default a ManyToManyField
that refers to itself, is als symmetrical, so you probably want to turn that off, since if a is a student of b, then b is not per se a student of a. You can do that by specifying symmetrical=False
[Django-doc]:
class User(AbstractUser):
teacher_or_student = models.CharField(max_length=100)
mobile_number = models.CharField(max_length=100)
grade = models.CharField(max_length=100)
laptop_yes_or = models.CharField(max_length=100)
students = models.ManyToManyField(
'self',
symmetrical=False,
related_name='teachers'
)
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