How to deal with "You have multiple authentication backends configured ..." (Django)

About this article

There was no workaround written in Japanese, so I will write it down.

Occurrence of problem

In the application created with Django, when creating a User and logging in as that user, the following error occurs.

You have multiple authentication backends configured 
and therefore must provide the `backend` argument or 
set the `backend` attribute on the user.

Cause

Even though multiple AUTHENTICATION_BACKENDS were used, backend was not specified in the login process.

views.py


#User registration screen

#Login process
login(self.request, user) #Error here

settings.py



AUTHENTICATION_BACKENDS = (
    'django.contrib.auth.backends.ModelBackend', # ID/pass
    'allauth.account.auth_backends.AuthenticationBackend', #social
)

approach

I specified backend.

views.py


#User registration screen

#Login process
login(self.request, user, backend='django.contrib.auth.backends.ModelBackend')

result

solved. You had to specify the backend.

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