How to use filter method for user model in another model (django)

user_17121421 0
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I have a custom user model:

# accounts > models.py > ...
class MyUser(AbstractUser):
     [...]
    
    fallowing_tags = models.ManyToManyField('posts.tag', blank=True)

And I want to filter all users who fallowed a specific tag:

from accounts.models import MyUser as User 
# ---- or -----
from django.contrib.auth import get_user_model
User = get_user_model()



class Tag(models.Model):
    name = models.SlugField(max_length=50, unique=True)

    @property
    def fallowers(self):
        return User.objects.filter(fallowing_tags=self)

But the program gives an error:

  File "~/path/to/blog/accounts/models.py", line 13, in <module>
    from posts.models import Tag, Post
  File "~/path/to/blog/posts/models.py", line 3, in <module>
    from accounts.models import MyUser as User 
ImportError: cannot import name 'MyUser' from partially initialized module 'accounts.models' (most likely due to a circular import) (~/path/to/blog/accounts/models.py)
django-views django-models django python
2 Answers

Django automatically adds a relation in reverse, so there is no need to add a followers, you can query with:

mytag.myuser_set.all()

If you want to change the name, you can set the related_name=… parameter [Django-doc], for example with:

class MyUser(AbstractUser):
     # …
    
    fallowing_tags = models.ManyToManyField(
        'posts.tag',
        blank=True,
        related_name='users'
    )

Then you thus query with:

mytag.users.all()
user_675790

It is ImportError and I think, it is because of this line from accounts.models import MyUser as User. It may be conflicting with django's inbuilt User model which is in django.contrib.auth. Try changing it to another name.

Well, i think you can also simply use Myuser.

Try:

from accounts.models import MyUser

OR

from accounts.models import MyUser as anyAnotherName

Note: Please don't give any name which has a possibility to conflict with django's libraries.

user_175620440
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