Authenticate user using email and password

Question

I have a form that only allow users to login via username . I decided to only allow user to login via email instead of username.

First, this is not a duplication of any

Answer 1

Looks like you are testing against 2 different fields. You look for the user against email

if User.objects.filter(email=user).exists():

but then validate against username

user = authenticate(username=user, password=password)

If you are using the email address the auth line should be

user = authenticate(email=user, password=password)