[Answer]-Django help me raise validation error

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1👍

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You can add clean_ method to the form class to validate the username field:

def clean_username(self):
    username = self.cleaned_data.get('username')
    if username:
        user = User.objects.filter(username=username)
        if user.exists():
            raise forms.ValidationError(
                _('That username exists in our system. Please try another.'),
                code='unique_username'
            )
    return username

Afterwards you should rewrite your view function to pass the form object to the registration template:

def register_user(request):
    args = {}
    args.update(csrf(request))

    if request.method == 'POST':
        form = MyRegistrationForm(request.POST)
        if form.is_valid():
            form.save()
            return HttpResponseRedirect('/accounts/register_success')
        else:
            args['form'] = form
            return render_to_response('register.html', args)

    args['form'] = MyRegistrationForm()
    print args
    return render_to_response('register.html', args)

I’m going to recommend that you find out how to display the error messages in the template by yourself.

These pages from Django’s documentation should provide more insight:

👤Claudiu

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