From d8f19bb3b6f858bef499fdab41948a5a5e8d55aa Mon Sep 17 00:00:00 2001
From: Greg Chapple <gregchapple1@gmail.com>
Date: Tue, 10 Jun 2014 10:32:46 +0100
Subject: [PATCH] Fixed #22792 -- Updated checks for list_display_links in
 model admin

---
 django/contrib/admin/checks.py |  7 +++++--
 tests/modeladmin/tests.py      | 24 ++++++++++++++++++++++++
 2 files changed, 29 insertions(+), 2 deletions(-)

diff --git a/django/contrib/admin/checks.py b/django/contrib/admin/checks.py
index e49bb8fb6e..335062562d 100644
--- a/django/contrib/admin/checks.py
+++ b/django/contrib/admin/checks.py
@@ -779,7 +779,7 @@ class ModelAdminChecks(BaseModelAdminChecks):
                     obj=cls,
                     id='admin.E122',
                 ),
-            elif field_name in cls.list_display_links:
+            elif cls.list_display_links and field_name in cls.list_display_links:
                 return [
                     checks.Error(
                         "The value of '%s' cannot be in both 'list_editable' and 'list_display_links'." % field_name,
@@ -788,7 +788,10 @@ class ModelAdminChecks(BaseModelAdminChecks):
                         id='admin.E123',
                     )
                 ]
-            elif not cls.list_display_links and cls.list_display[0] in cls.list_editable:
+            # Check that list_display_links is set, and that the first values of list_editable and list_display are
+            # not the same. See ticket #22792 for the use case relating to this.
+            elif (cls.list_display[0] in cls.list_editable and cls.list_display[0] != cls.list_editable[0] and
+                  cls.list_display_links is not None):
                 return [
                     checks.Error(
                         "The value of '%s' refers to the first field in 'list_display' ('%s'), "
diff --git a/tests/modeladmin/tests.py b/tests/modeladmin/tests.py
index 1c3a21d374..3f5f378818 100644
--- a/tests/modeladmin/tests.py
+++ b/tests/modeladmin/tests.py
@@ -1518,3 +1518,27 @@ class CustomModelAdminTests(CheckTestCase):
                 validator_class = CustomValidator
 
             self.assertIsInvalid(CustomModelAdmin, ValidationTestModel, 'error!')
+
+
+class ListDisplayEditableTests(CheckTestCase):
+    def test_list_display_links_is_none(self):
+        """
+        list_display and list_editable can contain the same values
+        when list_display_links is None
+        """
+        class ProductAdmin(ModelAdmin):
+            list_display = ['name', 'slug', 'pub_date']
+            list_editable = list_display
+            list_display_links = None
+        self.assertIsValid(ProductAdmin, ValidationTestModel)
+
+    def test_list_display_same_as_list_editable(self):
+        """
+        The first item in list_display can be the same as the first
+        in list_editable
+        """
+        class ProductAdmin(ModelAdmin):
+            list_display = ['name', 'slug', 'pub_date']
+            list_editable = ['name', 'slug']
+            list_display_links = ['pub_date']
+        self.assertIsValid(ProductAdmin, ValidationTestModel)