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.
Add a comment
|
2 Answers
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 }}
3 Comments
Bono
Note that according to the Django docs your backend should function as following; "check the credentials it gets, and it should return a User object that matches those credentials, if the credentials are valid. If they’re not valid, it should return None". Not sure if you were suggesting to raise a
ValidationError in the backend, but I'm just putting it out there.
Sebastián Vansteenkiste
@Bono, though you're right (and I like your music), facing the alternative of having to implement your own form, simply raising a ValidationError within the auth method is awfully simple and just works.
Sebastián Vansteenkiste
(of course, the idea is not to throw this for when a user enters "wrong" credentials as-in ones that don't match an existing user, but "wrong" in a sense that is considered invalid because of some other validation logic pertinent for this particular auth backend)
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.
