[1.5.x] Added further flexibility to ModelAdmin for controlling post-save redirections.

Refs #19505.
Backport of cee40c7d79

django/contrib/admin/options.py

@@ -838,7 +838,7 @@ class ModelAdmin(BaseModelAdmin):
         else:
             msg = _('The %(name)s "%(obj)s" was added successfully.') % msg_dict
             self.message_user(request, msg)
-            return self.response_post_save(request, obj)
+            return self.response_post_save_add(request, obj)
 
     def response_change(self, request, obj):
         """
@@ -872,13 +872,27 @@ class ModelAdmin(BaseModelAdmin):
         else:
             msg = _('The %(name)s "%(obj)s" was changed successfully.') % msg_dict
             self.message_user(request, msg)
-            return self.response_post_save(request, obj)
+            return self.response_post_save_change(request, obj)
 
-    def response_post_save(self, request, obj):
+    def response_post_save_add(self, request, obj):
         """
-        Figure out where to redirect after the 'Save' button has been pressed.
-        If the user has change permission, redirect to the change-list page for
-        this object. Otherwise, redirect to the admin index.
+        Figure out where to redirect after the 'Save' button has been pressed
+        when adding a new object.
+        """
+        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)
+
+    def response_post_save_change(self, request, obj):
+        """
+        Figure out where to redirect after the 'Save' button has been pressed
+        when editing an existing object.
         """
         opts = self.model._meta
         if self.has_change_permission(request, None):

tests/regressiontests/admin_custom_urls/models.py

@@ -56,10 +56,14 @@ class Person(models.Model):
 
 class PersonAdmin(admin.ModelAdmin):
 
-    def response_post_save(self, request, obj):
+    def response_post_save_add(self, request, obj):
         return HttpResponseRedirect(
             reverse('admin:admin_custom_urls_person_history', args=[obj.pk]))
 
+    def response_post_save_change(self, request, obj):
+        return HttpResponseRedirect(
+            reverse('admin:admin_custom_urls_person_delete', args=[obj.pk]))
+
 
 class Car(models.Model):
     name = models.CharField(max_length=20)
@@ -85,4 +89,4 @@ class CarDeprecatedAdmin(admin.ModelAdmin):
 admin.site.register(Action, ActionAdmin)
 admin.site.register(Person, PersonAdmin)
 admin.site.register(Car, CarAdmin)
-admin.site.register(CarDeprecated, CarDeprecatedAdmin)
+admin.site.register(CarDeprecated, CarDeprecatedAdmin)

tests/regressiontests/admin_custom_urls/tests.py

@@ -94,10 +94,11 @@ class CustomRedirects(TestCase):
     def tearDown(self):
         self.client.logout()
 
-    def test_post_save_redirect(self):
+    def test_post_save_add_redirect(self):
         """
-        Ensures that ModelAdmin.response_post_save() controls the redirection
-        after the 'Save' button has been pressed.
+        Ensures that ModelAdmin.response_post_save_add() controls the
+        redirection after the 'Save' button has been pressed when adding a
+        new object.
         Refs 8001, 18310, 19505.
         """
         post_data = { 'name': 'John Doe', }
@@ -109,6 +110,22 @@ class CustomRedirects(TestCase):
         self.assertRedirects(
             response, reverse('admin:admin_custom_urls_person_history', args=[persons[0].pk]))
 
+    def test_post_save_change_redirect(self):
+        """
+        Ensures that ModelAdmin.response_post_save_change() controls the
+        redirection after the 'Save' button has been pressed when editing an
+        existing object.
+        Refs 8001, 18310, 19505.
+        """
+        Person.objects.create(name='John Doe')
+        self.assertEqual(Person.objects.count(), 1)
+        person = Person.objects.all()[0]
+        post_data = { 'name': 'Jack Doe', }
+        response = self.client.post(
+            reverse('admin:admin_custom_urls_person_change', args=[person.pk]), post_data)
+        self.assertRedirects(
+            response, reverse('admin:admin_custom_urls_person_delete', args=[person.pk]))
+
     def test_post_url_continue(self):
         """
         Ensures that the ModelAdmin.response_add()'s parameter `post_url_continue`
@@ -139,4 +156,4 @@ class CustomRedirects(TestCase):
             self.assertRedirects(
                 response, reverse('admin:admin_custom_urls_cardeprecated_history', args=[cars[0].pk]))
         self.assertEqual(len(w), 1)
-        self.assertTrue(isinstance(w[0].message, DeprecationWarning))
+        self.assertTrue(isinstance(w[0].message, DeprecationWarning))