CODEWITHSUNDEEP
pythondjangodatabasemany-to-many
mel
mel

Reputation: 2790

Many to many field django add the relationship both way

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)

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

Upvotes: 3

Views: 878

Answers (2)

Rahul Reddy Vemireddy
Rahul Reddy Vemireddy

Reputation: 1155

Just set related_name="followed_by" for the many to many field. That would assign the reverse mapping to followed_by

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

Upvotes: 3

Daniel Roseman
Daniel Roseman

Reputation: 600049

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)

See the docs

Upvotes: 4

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