Fixed #16327 -- Redirected "Save as new" to change view instead of the changelist.

django/contrib/admin/options.py

@@ -487,6 +487,7 @@ class ModelAdmin(BaseModelAdmin):
     search_fields = ()
     date_hierarchy = None
     save_as = False
+    save_as_continue = True
     save_on_top = False
     paginator = Paginator
     preserve_filters = True
@@ -1102,7 +1103,11 @@ class ModelAdmin(BaseModelAdmin):
                 'popup_response_data': popup_response_data,
             })
 
-        elif "_continue" in request.POST:
+        elif "_continue" in request.POST or (
+                # Redirecting after "Save as new".
+                "_saveasnew" in request.POST and self.save_as_continue and
+                self.has_change_permission(request, obj)
+        ):
             msg = format_html(
                 _('The {name} "{obj}" was added successfully. You may edit it again below.'),
                 **msg_dict

docs/ref/contrib/admin/index.txt

@@ -1146,6 +1146,16 @@ subclass::
 
     By default, ``save_as`` is set to ``False``.
 
+.. attribute:: ModelAdmin.save_as_continue
+
+    .. versionadded:: 1.10
+
+    When :attr:`save_as=True <save_as>`, the default redirect after saving the
+    new object is to the change view for that object. If you set
+    ``save_as_continue=False``, the redirect will be to the changelist view.
+
+    By default, ``save_as_continue`` is set to ``True``.
+
 .. attribute:: ModelAdmin.save_on_top
 
     Set ``save_on_top`` to add save buttons across the top of your admin change

docs/releases/1.10.txt

@@ -753,6 +753,13 @@ Miscellaneous
   model, you must convert them to attributes or properties as described in
   :ref:`the deprecation note <user-is-auth-anon-deprecation>`.
 
+* When using :attr:`ModelAdmin.save_as=True
+  <django.contrib.admin.ModelAdmin.save_as>`, the "Save as new" button now
+  redirects to the change view for the new object instead of to the model's
+  changelist. If you need the previous behavior, set the new
+  :attr:`ModelAdmin.save_as_continue
+  <django.contrib.admin.ModelAdmin.save_as_continue>` attribute to ``False``.
+
 .. _deprecated-features-1.10:
 
 Features deprecated in 1.10

tests/admin_views/admin.py

@@ -1013,6 +1013,7 @@ site2.register(
     list_editable=['parent'],
     raw_id_fields=['parent'],
 )
+site2.register(Person, save_as_continue=False)
 
 site7 = admin.AdminSite(name="admin7")
 site7.register(Article, ArticleAdmin2)

tests/admin_views/tests.py

@@ -1119,9 +1119,23 @@ class SaveAsTests(TestCase):
     def test_save_as_duplication(self):
         """Ensure save as actually creates a new person"""
         post_data = {'_saveasnew': '', 'name': 'John M', 'gender': 1, 'age': 42}
-        self.client.post(reverse('admin:admin_views_person_change', args=(self.per1.pk,)), post_data)
+        response = self.client.post(reverse('admin:admin_views_person_change', args=(self.per1.pk,)), post_data)
         self.assertEqual(len(Person.objects.filter(name='John M')), 1)
         self.assertEqual(len(Person.objects.filter(id=self.per1.pk)), 1)
+        new_person = Person.objects.latest('id')
+        self.assertRedirects(response, reverse('admin:admin_views_person_change', args=(new_person.pk,)))
+
+    def test_save_as_continue_false(self):
+        """
+        Saving a new object using "Save as new" redirects to the changelist
+        instead of the change view when ModelAdmin.save_as_continue=False.
+        """
+        post_data = {'_saveasnew': '', 'name': 'John M', 'gender': 1, 'age': 42}
+        url = reverse('admin:admin_views_person_change', args=(self.per1.pk,), current_app=site2.name)
+        response = self.client.post(url, post_data)
+        self.assertEqual(len(Person.objects.filter(name='John M')), 1)
+        self.assertEqual(len(Person.objects.filter(id=self.per1.pk)), 1)
+        self.assertRedirects(response, reverse('admin:admin_views_person_changelist', current_app=site2.name))
 
     def test_save_as_new_with_validation_errors(self):
         """
@@ -1689,6 +1703,15 @@ class AdminViewPermissionsTest(TestCase):
         self.assertEqual(post.status_code, 403)
         self.assertEqual(Article.objects.count(), article_count)
 
+        # User with both add and change permissions should be redirected to the
+        # change page for the newly created object.
+        article_count = Article.objects.count()
+        self.client.force_login(self.superuser)
+        post = self.client.post(article_change_url, change_dict_save_as_new)
+        self.assertEqual(Article.objects.count(), article_count + 1)
+        new_article = Article.objects.latest('id')
+        self.assertRedirects(post, reverse('admin:admin_views_article_change', args=(new_article.pk,)))
+
     def test_delete_view(self):
         """Delete view should restrict access and actually delete items."""
         delete_dict = {'post': 'yes'}