Django 1.7 - Modifying a Model Property

Question

Earlier in Django 1.6 and earlier, I used the following to make the User email attribute unique:

 class User(AbstractUser): USERNAME_FIELD = 'email' REQUIRED_FIELDS = ['username'] User._meta.get_field_by_name('email')[0]._unique=True 

I port to Django 1.7, but this code causes the following error:

 django.core.exceptions.AppRegistryNotReady: Models aren't loaded yet. 

traced all the way to User._meta.get_field_by_name('email')[0]._unique=True .

How do I port this to Django 1.7?

Answer 1

According to the documentation, the ready() method of AppConfig is called when the registry is full, which means that models are also loaded, so references to models should not be a problem.

This line of code is still invalid because it is in ready() , though, as stated in the documentation:

You cannot import models into modules that define the application of configuration classes, but you can use get_model () to access the model class by name

Therefore, remove User._meta.get_field_by_name('email')[0]._unique=True from models.py and follow these steps in the application configuration:

 class AccountsConfig(AppConfig): name = 'modules.accounts' def ready(self): self.get_model('User')._meta.get_field_by_name('email')[0]._unique=True