Ticket #2473: where_false.diff

django/db/models/query.py

@@ -641 +641 @@
-    except KeyError:
-        pass
-    if lookup_type == 'in':
-
+
+
+
+
+
-    elif lookup_type == 'range':
-        return '%s%s BETWEEN %%s AND %%s' % (table_prefix, field_name)
-    elif lookup_type in ('year', 'month', 'day'):

tests/modeltests/or_lookups/models.py

@@ -69 +69 @@
->>> Article.objects.filter(Q(pk=1) | Q(pk=2) | Q(pk=3))
-[<Article: Hello>, <Article: Goodbye>, <Article: Hello and goodbye>]
-
+# You could also use "in" to accomplish the same as above.
+>>> Article.objects.filter(pk__in=[1,2,3])
+[<Article: Hello>, <Article: Goodbye>, <Article: Hello and goodbye>]
+
+>>> Article.objects.filter(pk__in=[1,2,3,4])
+[<Article: Hello>, <Article: Goodbye>, <Article: Hello and goodbye>]
+
+# Passing "in" an empty list returns no results.
+>>> Article.objects.filter(pk__in=[])
+[]
+
+# But can return results if we OR it with another query.
+>>> Article.objects.filter(Q(pk__in=[]) | Q(headline__icontains='goodbye'))
+[<Article: Goodbye>, <Article: Hello and goodbye>]
+
-# Q arg objects are ANDed
->>> Article.objects.filter(Q(headline__startswith='Hello'), Q(headline__contains='bye'))
-[<Article: Hello and goodbye>]