多对多字段django双向添加关系 [英] Many to many field django add the relationship both way

问题描述

我正在尝试执行一项允许用户关注另一个功能的功能.问题是，当我将新用户添加到关注对象"中时，关注另一个用户的用户也会添加到关注用户的以下列表中.例如，如果用户a跟随用户b，我将拥有:

I'm trying to do a function that allow a user to follow another one. the problem is when I'm adding a new user to the "followings" the user that follow another user is also added in the following list of the followed user. For example if user a follow user b I will have that:

view.py

def follow_test(request):
    name = request.POST.get('name', '')
    user_followed = Dater.objects.get(username=name)
    current_user = Dater.objects.get(id=request.user.id)
    print "Current", current_user.followings.all() # display []
    print "Followed", user_followed.followings.all() # display []
    current_user.followings.add(user_followed)
    print "Current", current_user.followings.all() # display <Dater: b>
    print "Followed", user_followed.followings.all() # display <Dater: a>

model.py :

followings = models.ManyToManyField('self', blank=True)

我希望仅将用户b添加到a的以下内容中

I would like the user b only to be add in the followings of a

推荐答案

默认情况下，自我上的多对多关系是对称的.如果您不想这样做，请将symmetrical设置为False:

By default, many-to-many relationships on self are symmetrical. If you don't want this, set symmetrical to False:

followings = models.ManyToManyField('self', blank=True, symmetrical=False)

请参见文档

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