How to change the default username to email, in DRF obtain token login

Using Django Forms & APIs
1

This is my login path

from rest_framework.authtoken.views import obtain_auth_token
urlpatterns = [
     ...
    path('login/', obtain_auth_token), 
]

When I use this as a login, it takes username(though it takes email as field data) & password and generate the token for me

{
    "username": "manig@gmail.com",
    "password" : "manig@gmail.com"
}

how I want it


{
    "email": "manig@gmail.com", 
    "password" : "manig@gmail.com"
}

I want to replace username with email!!
how should I modify this ?

**What I have tried till now is: **
I have made the custom serializer

class AuthTokenSerializer(serializers.ModelSerializer):
    class Meta:
        model = AuthUser
        fields = ('email', 'password')
        extra_kwargs = {'password': {'write_only': True}}
    
    def validate(self, data):
        user_obj = None
        email = data.get('email')
        password = data.get('password')
        if email and password:
            user_obj = AuthUser.objects.filter(email=email).first()
            if not user_obj:
                raise serializers.ValidationError("This email is not registered")
            if not user_obj.check_password(password):
                raise serializers.ValidationError("Incorrect credentials")
        return data
    
    def create(self, validated_data):
        user = AuthUser.objects.get(email=validated_data['email'])
        refresh = RefreshToken.for_user(user)
        return {
            'user': user,
            'token': str(refresh.access_token)
        }

And here is the view for it

class AuthLoginUser(ObtainAuthToken):
    def post(self, request, *args, **kwargs):
        serializer = AuthTokenSerializer(data=request.data, context={'request': request})
        serializer.is_valid(raise_exception=True)
        user = serializer.validated_data['user']
        token, created = Token.objects.get_or_create(user=user)
        return Response({
            'token': token.key,
            'first_name': user.first_name,
            'last_name': user.last_name,
            'email': user.email,
            'role': user.role
            })

And this is how url pattern is

urlpatterns = [
    ...
    path('login/', views.AuthLoginUser.as_view()),
]

And when I do this it does replaces username field with email, but when I login/pass the data through the endpoint

Screenshot 2022-08-12 at 9.01.34 AM
Screenshot 2022-08-12 at 9.01.34 AM1216Ă—286 34.3 KB

It starts giving me this error, user with this email already exists, instead it should have replied with token, first name, lastname email and role

How can I fix this issue ?

2

Hey @Suraj7879
Remember DRF “abstracts” whats write in Django code, for putting in that way.
You need to create an “AbstractUser”, which is a partially-custom User model
You’d need to do something like this:

class CustomUser(AbstractUser):
    username = None
    email = models.EmailField(_('email address'), unique=True)

    USERNAME_FIELD = 'email'
    REQUIRED_FIELDS = []

Then you need to call this “CustomUser” model in your “settings.py” file, like this:

AUTH_USER_MODEL = 'nameOfTheApp.CustomUser'

This would be the good way of doing it.
The “bad” way could be to change the “username” field for a “models.EmailField”, but the field required for DRF would be still “username” instead of “email”
Let me know if this helps you, or I can help you in any other way
Greetings

1 Like
3

See this