模型自我依赖（一对多领域）实现 [英] model self-dependency (one-to-many field) implementation

问题描述

我想实现一个具有自我依赖性的模型。说实例People_A可能依赖于People_B和People_C。
我首先实现这个模型，有很多到很多键。

  class People（models.Model）：
 
 dependency = models。 ManyToManyField（'self'，blank = True，null = True）
  

但结果是如果People_A依靠People_B将导致People_B依赖于People_A。这是我不想拥有的东西。

然后我用外键实现它。

  class People model.Model）：
 
 dependency = models.ForeignKey（'self'，blank = True，null = True）
  

但这不行。如果People_A依赖于People_B，那么没有其他人可以依靠People_B。它将以最新的依赖关系覆盖旧的依赖关系。

任何线索都会感激

解决方案

我认为这是你要找的：

  dependencies = models.ManyToManyField（self ，对称= False）
  

请参阅 docs 用于对称。

I would like to implement a model with self-dependency. Say instance People_A may depend on People_B and People_C. I first implement this model with many to many key.

class People(models.Model):

dependency = models. ManyToManyField ('self', blank=True, null=True)

But the result is that if People_A depend on People_B will result in People_B depend also on People_A. That’s something I don’t want to have.

Then I implement it with foreign key.

class People(models.Model):

dependency = models.ForeignKey('self', blank=True, null=True)

But this doesn’t work also. If People_A depend on People_B, then no other People could depend on People_B. It will cover the old dependency with the latest dependency.

Any clue would be thankful

解决方案

I think this is what you're looking for:

dependencies = models.ManyToManyField("self", symmetrical=False)

See the docs for symmetrical.

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