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?
Just use try and catch.
from django.db import IntegrityError
from django.shortcuts import render_to_response
try:
# code that produces error
except IntegrityError as e:
return render_to_response("template.html", {"message": e.message})
If you want you can use the message in your template.
EDIT
Thanks for Jill-Jênn Vie, you should use e.__cause__
, as described here.
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.
Simplest solution: write a middleware implementing process_exception
that only catches IntegrityError and returns an HttpResponse with your rendered template, and make sure this middleware is after the default error handling middleware so it is called before (cf https://docs.djangoproject.com/en/dev/topics/http/middleware/#process-exception for more).
Now if I was you, I wouldn't assume such a thing as "there is only one obvious case where "IntegrityError" can arise", so I strongly recommand you do log the exception (and send email alerts) in your middleware.
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