From e307ff29d28737d5a764ce2fa7db010231d6fc8e Mon Sep 17 00:00:00 2001
From: Andreas Pelme <andreas@pelme.se>
Date: Fri, 16 Feb 2018 03:00:31 +0100
Subject: Fixed #27810 -- Allowed query expressions in admin_order_field.

---
 tests/admin_views/admin.py | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'tests/admin_views/admin.py')

diff --git a/tests/admin_views/admin.py b/tests/admin_views/admin.py
index 04e40c2e0d..ceae4c11a2 100644
--- a/tests/admin_views/admin.py
+++ b/tests/admin_views/admin.py
@@ -1,3 +1,4 @@
+import datetime
 import os
 import tempfile
 from io import StringIO
@@ -94,6 +95,7 @@ class ArticleAdmin(admin.ModelAdmin):
     list_display = (
         'content', 'date', callable_year, 'model_year', 'modeladmin_year',
         'model_year_reversed', 'section', lambda obj: obj.title,
+        'order_by_expression',
     )
     list_editable = ('section',)
     list_filter = ('date', 'section')
@@ -110,6 +112,12 @@ class ArticleAdmin(admin.ModelAdmin):
         })
     )
 
+    def order_by_expression(self, obj):
+        return obj.model_year
+    # This ordering isn't particularly useful but shows that expressions can
+    # be used for admin_order_field.
+    order_by_expression.admin_order_field = models.F('date') + datetime.timedelta(days=3)
+
     def changelist_view(self, request):
         return super().changelist_view(request, extra_context={'extra_var': 'Hello!'})
 
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