[1.9.x] Fixed #25531 -- Documented that admin_order_field supports lookups.

Backport of 2c727101113770d41e0907b333568bc2c25435e0 from master

1 files changed, 16 insertions, 0 deletions

diff --git a/docs/ref/contrib/admin/index.txt b/docs/ref/contrib/admin/index.txt
index 3cf8ae59c5..6fa34228f9 100644
--- a/docs/ref/contrib/admin/index.txt
+++ b/docs/ref/contrib/admin/index.txt
@@ -714,6 +714,22 @@ subclass::
 
           colored_first_name.admin_order_field = '-first_name'
 
+      ``admin_order_field`` supports query lookups to sort by values on related
+      models. This example includes an "author first name" column in the list
+      display and allows sorting it by first name::
+
+          class Blog(models.Model):
+              title = models.CharField(max_length=255)
+              author = models.ForeignKey(Person, on_delete=models.CASCADE)
+
+          class BlogAdmin(admin.ModelAdmin):
+              list_display = ('title', 'author', 'author_first_name')
+
+              def author_first_name(self, obj):
+                  return obj.author.first_name
+
+              author_first_name.admin_order_field = 'author__first_name'
+
     * Elements of ``list_display`` can also be properties. Please note however,
       that due to the way properties work in Python, setting
       ``short_description`` on a property is only possible when using the