Ubuntu.my.id

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

Posted on Mar 12, 2022

Question

first of i am new to django/python .

i am trying to create a login website that allows the user to register an account and verify via email or directly login via fb or google(Oauth)

i receive the error when i click on the validation url sent to the email.

error:

ValueError at /activate/Mjk/4p1-dcc5f7ed2e7c847fe362/

You have multiple authentication backends configured and therefore must


provide the backend argument or set the backend attribute on the user.


Request Method: GET


Request URL:    http://127.0.0.1:8000/activate/Mjk/4p1-dcc5f7ed2e7c847fe362/
Django Version: 1.11.3


Exception Type: ValueError


Exception Value:


You have multiple authentication backends configured and therefore must provide the backend argument or set the backend attribute on the user.
Exception Location: /usr/local/lib/python2.7/dist-packages/django/contrib/auth/init.py in login, line 149
Python Executable:  /usr/bin/python
Python Version: 2.7.12
Python Path: 

[’/home/gaby/django projects/simple-signup-master/profile-model’,
‘/usr/local/lib/python2.7/dist-packages/virtualenv-15.1.0-py2.7.egg’,
‘/usr/lib/python2.7’,
‘/usr/lib/python2.7/plat-x86_64-linux-gnu’,
‘/usr/lib/python2.7/lib-tk’,
‘/usr/lib/python2.7/lib-old’,
‘/usr/lib/python2.7/lib-dynload’,
‘/home/gaby/.local/lib/python2.7/site-packages’,
‘/usr/local/lib/python2.7/dist-packages’,
‘/usr/lib/python2.7/dist-packages’,
‘/usr/lib/python2.7/dist-packages/PILcompat’,
‘/usr/lib/python2.7/dist-packages/gtk-2.0’,
‘/usr/lib/python2.7/dist-packages/ubuntu-sso-client’]
Server time:    Wed, 30 Aug 2017 12:34:31 +0000

mysite/settings

AUTHENTICATION_BACKENDS = (

 'social_core.backends.facebook.FacebookOAuth2',
 'social_core.backends.google.GoogleOAuth2',

 'django.contrib.auth.backends.ModelBackend',

)

this is the function being called when i receive the error

    def activate(request, uidb64, token):
    try:
    uid = force_text(urlsafe_base64_decode(uidb64))
    user = User.objects.get(pk=uid)
    except (TypeError, ValueError, OverflowError, User.DoesNotExist):
    user = None

if user is not None and account_activation_token.check_token(user, 
token):
user.is_active = True
user.profile.email_confirmed = True
user.save()
login(request, user)
return redirect('home')

else:
return render(request, ‘account_activation_invalid.html’)

i started receiving the error after adding the oath login via fb,google. if i remove'social_core.backends.facebook.FacebookOAuth2','social_core.backends.google.GoogleOAuth2' from AUTHENTICATION_BACKENDS the email confirmation will work again.

i searched online and also here the only solution that i found was below but it didn't solve my problem.

here

Answer

I found the solution. call login() with backend argument like login(request, user, backend='django.contrib.auth.backends.ModelBackend')

here is full code:

def activate(request, uidb64, token, backend='django.contrib.auth.backends.ModelBackend'):
    try:
        uid = force_text(urlsafe_base64_decode(uidb64))
        user = User.objects.get(pk=uid)
    except (TypeError, ValueError, OverflowError, User.DoesNotExist):
        user = None

if user is not None and account_activation_token.check_token(user, token):
    user.is_active = True
    user.profile.email_confirmed = True
    user.save()
    login(request, user, backend='django.contrib.auth.backends.ModelBackend')
    return redirect('home')
else:
    return render(request, 'account_activation_invalid.html')