'Figure out where to redirect after the \'Save\' button has been pressed
when adding a new object.'

def response_post_save_add(self, request, obj):

    opts = self.model._meta
    if self.has_change_permission(request, None):
        post_url = reverse(('admin:%s_%s_changelist' % (opts.app_label, opts.module_name)), current_app=self.admin_site.name)
    else:
        post_url = reverse('admin:index', current_app=self.admin_site.name)
    return HttpResponseRedirect(post_url)
