[soc2010/query-refactor] Added a forgotten file from r13441.

git-svn-id: http://code.djangoproject.com/svn/django/branches/soc2010/query-refactor@13442 bcc190cf-cafb-0310-a4f2-bffc1f526a37

1 files changed, 21 insertions, 0 deletions

diff --git a/django/db/models/fields/structures.py b/django/db/models/fields/structures.py
new file mode 100644
index 0000000000..2d3822e932
--- /dev/null
+++ b/django/db/models/fields/structures.py
@@ -0,0 +1,21 @@
+from django.db.models.fields import Field
+
+
+class ListField(Field):
+    def __init__(self, field_type):
+        self.field_type = field_type
+        super(ListField, self).__init__()
+    
+    def get_prep_lookup(self, lookup_type, value):
+        return self.field_type.get_prep_lookup(lookup_type, value)
+    
+    def get_db_prep_save(self, value, connection):
+        return [
+            self.field_type.get_db_prep_save(o, connection=connection)
+            for o in value
+        ]
+    
+    def get_db_prep_lookup(self, lookup_type, value, connection, prepared=False):
+        return self.field_type.get_db_prep_lookup(
+            lookup_type, value, connection=connection, prepared=prepared
+        )