view_utils.py

class UserOwned(object):

    user_field = "user"

    def get_user_field(self):
        return self.user_field

    def get_user(self):
        return self.request.user if self.request.user.is_authenticated() else None

    def filter_by_user(self, queryset):
        # Filter the Query down to only objects owned by this user
        queryset = queryset.filter(**{self.get_user_field(): self.get_user()})
        return queryset

    def get_queryset(self):
        """
        Get the list of items for this view. This must be an queryset.
        """
        if self.queryset is not None:
            queryset = self.queryset._clone()
        elif self.model is not None:
            queryset = self.model._default_manager.all()
        else:
            raise ImproperlyConfigured(u"'%s' must define 'queryset' or 'model'"
                                       % self.__class__.__name__)

        queryset = self.filter_by_user(queryset)

        return queryset

    def form_valid(self, form):
        self.object = form.save(commit=False)
        setattr(self.object, self.get_user_field(), self.get_user())
        self.object.save()
        return HttpResponseRedirect(self.get_success_url())