CODEWITHSUNDEEP
pythondjango
Gnanavel pandian
Gnanavel pandian

Reputation: 83

Unable to set auth_user model primary key as foreign key in my app models.py

I am trying to create a blog app with models.py I want to set auth_user model primary key as foreign key to my model in blog app.After adding the appropriate code i am getting the following error? 

 from django.db import models
 from django.conf import settings

 # Create your models here.
 class Post(models.Model):
   title=models.CharField(max_length=100)
   desc=models.TextField()
   date=models.DateTimeField(auto_now=True)
   author=models.ForeignKey("settings.AUTH_USER_MODEL",
                                         on_delete=models.CASCADE)

ERRORS: blog.Post.author: (fields.E300) Field defines a relation with model 'User', which is either not installed, or is abstract. blog.Post.author: (fields.E307) The field blog.Post.author was declared with a lazy reference to 'blog.user', but app 'blog' doesn't provide model 'user'.

Upvotes: 2

Views: 532

Answers (1)

willeM_ Van Onsem
willeM_ Van Onsem

Reputation: 477055

You should not use a string literal here, the settings.AUTH_USER_MODEL [Django-doc] itself is a string that contains the name of the user model, as specified in the documentation:

AUTH_USER_MODEL

Default: 'auth.User'

The model to use to represent a User. (..)

You thus implement this like:

from django.db import models
from django.conf import settings

class Post(models.Model):
    title=models.CharField(max_length=100)
    desc=models.TextField()
    date=models.DateTimeField(auto_now=True)
    author=models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)

The idea is that you either pass a reference to the class itself, or you use the a qualified name as a string for it. But 'settings.AUTH_USER_MODEL' is not the qualified name of the user model.

Alternatively, you can use get_user_model(..) [Django-doc]:

from django.db import models
from django.contrib.auth import get_user_model

class Post(models.Model):
    title=models.CharField(max_length=100)
    desc=models.TextField()
    date=models.DateTimeField(auto_now=True)
    author=models.ForeignKey(get_user_model(), on_delete=models.CASCADE)

Upvotes: 2

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