Removing case sensitivity from Email in Django login form

Question

Before anyone marks it as duplicate, I\'ve searched everywhere and didn\'t find. I\'ve created a custom UserModel and used Email as main authenticating id instead of usernam

Answer 1

You don't need to change much to accomplish this - in your case you just need to change the form and make use of Django's built-in form data cleaners or by making a custom field.

You should use the EmailField instead of a CharField for built-in validation. Also you did not post your AuthenticationForm, but i presume you have changed it to include email instead of username.

With data cleaners:

class SignUpForm(UserCreationForm):
    # your code
    email = forms.EmailField(required=True)
    def clean_email(self):
        data = self.cleaned_data['email']
        return data.lower()

class AuthenticationForm(forms.Form):
    # your code
    email = forms.EmailField(required=True)
    def clean_email(self):
        data = self.cleaned_data['email']
        return data.lower()

With a custom field:

class EmailLowerField(forms.EmailField):
    def to_python(self, value):
        return value.lower()

class SignUpForm(UserCreationForm):
    # your code
    email = EmailLowerField(required=True)

class AuthenticationForm(forms.Form):
    # your code
    email = EmailLowerField(required=True)

This way you can make sure that each email is saved to your database in lowercase and that for each login attempt the email is lowercased before compared to a database value.