[BUG] Sign up form not valid

[dragon-fire-fly]

Describe the bug When the signup form is submitted, rather than validating the form and redirecting to the success page, the signup form page is being rendered again.

This is the responsible code:

class SignupView(TemplateView):
    model = User
    template_name = "app_user/signup.html"

    def post(self, request, *args, **kwargs):
        signup_form = UserSignupForm(request.POST)
        if signup_form.is_valid():
            user = signup_form.save()
            login(request, user)
            return redirect(reverse("app_user:success"))
        return redirect(reverse("app_user:signup"))

Using a breakpoint (after signup_form = UserSignupForm(request.POST), the object being returned when the form is submitted is as so: <UserSignupForm bound=True, valid=Unknown, fields=(username;email;password)> Therefore, the if signup_form.is_valid(): check returns FALSE and the app_user:signup page is being rendered.

To Reproduce Steps to reproduce the behavior:

1. Go to signup form (http://127.0.0.1:8000/user/signup/)
2. Fill in and submit form
3. See error

Expected behavior The form should be evaluated as valid and the success page (return redirect(reverse("app_user:success"))) should be displayed.

Screenshots

Desktop (please complete the following information):

• OS: Ubuntu 22.04
• Browser: Chrome
• Version: 108.0

[dragon-fire-fly]

Adding a print statement to see the signup_form.errors showed the following ValueError: ValueError: You have multiple authentication backends configured and therefore must provide the 'backend' argument or set the 'backend' attribute on the user. This was also shown in the browse (see screenshots).

Looking into the settings.py, AUTHENTICATION_BACKENDS were added in two places and were therefore conflicting. One of the copies was removed and the form was able to be validated and the user redirected to the success page.