Question

Hay I ve 谈到关系问题。

我想让用户有友谊。因此,用户可以成为另一个用户的朋友。我假定,需要通过一个友谊桌来使用许多“ToMany”现场。但我们不能让它发挥作用。任何想法?

这里是我的榜样。

class User(models.Model):
    username = models.CharField(max_length=999)
    password = models.CharField(max_length=999)
    created_on = models.DateField(auto_now = False, auto_now_add = True)
    updated_on = models.DateField(auto_now = True, auto_now_add = False)
    friends = models.ManyToManyField( self )
    pendingFriends = models.ManyToManyField( self , through= PendingFriendship , symmetrical=False, related_name= friend_requested )

class PendingFriendship(models.Model):
    user = models.ForeignKey( User , related_name= user )
    requested_friend = models.ForeignKey( User , related_name= requested_friend )
    created_on = models.DateField(auto_now = False, auto_now_add = True)
    updated_on = models.DateField(auto_now = True, auto_now_add = False)

增编

Answer 1

http://docs.djangoproject.com/en/1.1/ref/models/fields/#manytomanyfield”rel=“noreferer”>。赞成:

class User(models.Model):
    username = models.CharField(max_length=999)
    password = models.CharField(max_length=999)
    created_on = models.DateField(auto_now = False, auto_now_add = True)
    updated_on = models.DateField(auto_now = True, auto_now_add = False)
    friends = models.ManyToManyField( self )

如果你想在关系中增加额外领域,你只得使用<条码>。关于所有可能性的另一种描述见http://docs.djangoproject.com/en/1.1/topics/db/models/#many-to-many-relations”rel=“noreferer”>。

您称“你”的模型User,我假定你没有在认证框架内使用该建筑。但是,如果你使用,你就不必执行认证,这样就想。

Update: Have you read the sections I linked to? There it is described:

对中间模式有一些限制:

Your intermediate model must contain one - and only one - foreign key to the target model (this would be Person in our example). If you have more than one foreign key, a validation error will be raised.

Your intermediate model must contain one - and only one - foreign key to the source model (this would be Group in our example). If you have more than one foreign key, a validation error will be raised.

The only exception to this is a model which has a many-to-many relationship to itself, through an intermediary model. In this case, two foreign keys to the same model are permitted, but they will be treated as the two (different) sides of the many-to-many relation.

When defining a many-to-many relationship from a model to itself, using an intermediary model, you must use symmetrical=False (see the model field reference).

Answer 2

这一博客解释了你需要什么。从博客中,你只得改变相关名称。

pendingFriends = models.ManyToManyField( self , through= PendingFriendship , symmetrical=False, related_name= friend_requested )

页: 1

related_name= friend_requested+

然而,我仍然无法自动建立不对称关系。

友情链接