I am getting similar issue. No reply on your question. Please share the 
solution if you found


On Monday, 8 February 2016 19:50:07 UTC+5:30, Aubrey Stark-Toller wrote:
>
> Hello, 
>
> When I override the AUTH_USER_MODEL setting to "auth.User",  when 
> AUTH_USER_MODEL in settings is not set to "auth.User", in 
> either a TestCase or individual test, and then try to access the objects 
> attribute on the user model, I get an AttributeError. 
>
> The exact error I get is: 
> AttributeError: Manager isn't available; 'auth.User' has been swapped 
> for 'None' 
>
> I've found this to be the case in both Django 1.8 and 1.9. 
>
> This is easily reproducible in a fresh project : create a boilerplate 
> project with a boilerplate app, add a new user model (call it 
> CustomUser) to the app and set to AUTH_USER_MODEL to CustomUser, and add 
> the following test case to the app: 
>
> > from django.test import TestCase, override_settings 
> > from django.contrib.auth import get_user_model 
> > 
> > class MyTestCase(TestCase): 
> >    @override_settings(AUTH_USER_MODEL = 'auth.User') 
> >    def test_custom_user(self): 
> >        UserModel = get_user_model() 
> >        UserModel.objects.all() 
>
> get_user_model() retrieves the correct model but accessing objects 
> attribute gives the stated error when running the test. 
>
> If I throw in another user model (say CustomerUser2) and write a test 
> such as: 
>
> >    @override_settings(AUTH_USER_MODEL = 'another_app.CustomerUser2') 
> >    def test_custom_user(self): 
> >        UserModel = get_user_model() 
> >        UserModel.objects.all() 
>
> this works fine, and if I unset AUTH_USER_MODEL in settings again 
> everything works as expected. 
>
> Perhaps someone can shed some light on this behavior? 
>
> Cheers, 
> Aubrey 
>

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