Django: Catching Integrity Error and showing a customized message using template

Question

In my django powered app there is only one obvious case where \"IntegrityError\" can arise.
So, how can I catch that error and display a message using templates?

Answer 1

If you're using class-based views with the CreateView mixin, you'll want to try the call to the superclass's form_valid, for example:

from django.db import IntegrityError
...
class KumquatCreateView(CreateView):
    model = Kumquat
    form_class = forms.KumquatForm
    ...
    def form_valid(self, form):
        ...
        try:
            return super(KumquatCreateView, self).form_valid(form)
        except IntegrityError:
            return HttpResponse("ERROR: Kumquat already exists!")

You can use a template, render_to_response etc. to make the output nicer, of course.