Django - Error Message in Custom Auth Backend

Question

I have written a custom auth backend by extending the defalut ModelBackend. Is it possible to send a custom error message to login screen? As of now it is displaying the default message.

Answer 1

You can raise a django ValidationError

from django.core.exceptions import ValidationError

raise ValidationError("Some custom message")

You can then display it with:

{{ form.non_field_errors|striptags }}

Answer 2

The error messages are coming as ValidationError exceptions raised by django.contrib.auth.forms.AuthenticationForm. You would need to extend the Authentication Form or implement your own authentication form to change it's error messages.