From 00c3ba2f196a3a04fb102a822474c896a9f1719e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Andreas=20N=C3=BC=C3=9Flein?= <andreas@nuessle.in>
Date: Tue, 7 Apr 2015 16:54:35 +0200
Subject: [PATCH] get_db_prep_value on
 year_lookup_bounds_for_date/datetime_field

---
 django/db/models/fields/__init__.py | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/django/db/models/fields/__init__.py b/django/db/models/fields/__init__.py
index b305330..ca0863f 100644
--- a/django/db/models/fields/__init__.py
+++ b/django/db/models/fields/__init__.py
@@ -776,9 +776,13 @@ class Field(RegisterLookupMixin):
             return []
         elif lookup_type == 'year':
             if isinstance(self, DateTimeField):
-                return connection.ops.year_lookup_bounds_for_datetime_field(value)
+                values = connection.ops.year_lookup_bounds_for_datetime_field(value)
+                return [self.get_db_prep_value(v, connection=connection,
+                                           prepared=prepared) for v in values]
             elif isinstance(self, DateField):
-                return connection.ops.year_lookup_bounds_for_date_field(value)
+                values = connection.ops.year_lookup_bounds_for_date_field(value)
+                return [self.get_db_prep_value(v, connection=connection,
+                                           prepared=prepared) for v in values]
             else:
                 return [value]          # this isn't supposed to happen
         else:
-- 
1.9.1

