Added none() to queryset (MongoEngine/mongoengine#127)

docs/changelog.rst

@@ -4,6 +4,7 @@ Changelog
 
 Changes in 0.8
 ==============
+- Added none() to queryset (MongoEngine/mongoengine#127)
 - Updated SequenceFields to allow post processing of the calculated counter value (MongoEngine/mongoengine#141)
 - Added clean method to documents for pre validation data cleaning (MongoEngine/mongoengine#60)
 - Added support setting for read prefrence at a query level (MongoEngine/mongoengine#157)

mongoengine/queryset/queryset.py

@@ -489,6 +489,10 @@ class QuerySet(object):
         self._iter = False
         self._cursor.rewind()
 
+    def none(self):
+        """Helper that just returns a list"""
+        return []
+
     def count(self):
         """Count the selected elements in the query.
         """

tests/test_queryset.py

@@ -252,6 +252,14 @@ class QuerySetTest(unittest.TestCase):
 
         Blog.drop_collection()
 
+    def test_none(self):
+        class A(Document):
+            pass
+
+        A.drop_collection()
+        A().save()
+        self.assertEqual(A.objects.none(), [])
+
     def test_chaining(self):
         class A(Document):
             pass