class User(models.Model):
name = models.CharField(max_length=100)
age = models.IntegerField()
gender = models.IntegerField()
email = models.CharField(max_length=100)
password = models.CharField(max_length=255)
following = models.ManyToManyField("self", related_name='followers')
objects = UserManager()
def __repr__(self):
return "User: {0}".format(self.name)
In my model, User, users can follow and followed by each other.
I can find who the user is following by this:
user1 = User.objects.get(id=1)
following = user1.following.all()
However, I can't figure out how to find whom the user is followed by.
I tried:
user1.followers.all()
since it is the related_name in the following field in my model.
Can anybody please teach me how to do this?
Thank you very much.
You should pass the symmetrical
attribute to be False
.
From the docs:
When Django processes this model, it identifies that it has a
ManyToManyField
on itself, and as a result, it doesn’t add afollowers
attribute to theUser
class. Instead, theManyToManyField
is assumed to be symmetrical – that is, if I am yourfollower
, then you are myfollower
.If you do not want symmetry in many-to-many relationships with
self
, setsymmetrical
toFalse
. This will force Django to add the descriptor for the reverse relationship, allowingManyToManyField
relationships to be non-symmetrical.
In your case:
class User(models.Model):
# ...
following = models.ManyToManyField('self', related_name='followers', symmetrical=False)
# ...
Then in your views.py
you can access both:
following = user.following.all()
followers = user.followers.all()
Since now the relationship with self
is non-symmetrical.
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