DeletionMixin: allow substitution in success_url

[anonymous]

Let's say I have object with parent set and once object is deleted, browser should be redirected to parent page.
Expected way to work is:
url(r'^{object/(?P<pk>\d+)/delete/$', DeleteView.as_view(model=Object, success_url='/parent/%(parent_id)d/'), name='object_delete'),}

This can be achieved by evaluating success_url first and then deleting object:
class DeletionMixin(object):

"""
A mixin providing the ability to delete objects
"""
success_url = None

def delete(self, request, *args, kwargs):

self.object = self.get_object()
success_url = self.get_success_url()
self.object.delete()
return HttpResponseRedirect(success_url)

# Add support for browsers which only accept GET and POST for now.
def post(self, *args, kwargs):

return self.delete(*args, kwargs)

def get_success_url(self):

if self.success_url:

return self.success_url % self.object.dict

else:

raise ImproperlyConfigured(

"No URL to redirect to. Provide a success_url.")