First as_pymongo implementation

mongoengine/queryset.py

@@ -353,6 +353,7 @@ class QuerySet(object):
         self._slave_okay = False
         self._iter = False
         self._scalar = []
+        self._as_pymongo = False
 
         # If inheritance is allowed, only return instances and instances of
         # subclasses of the class being used
@@ -1002,6 +1003,10 @@ class QuerySet(object):
             if self._scalar:
                 return self._get_scalar(self._document._from_son(
                         self._cursor.next()))
+
+            if self._as_pymongo:
+                return self._cursor.next()
+
             return self._document._from_son(self._cursor.next())
         except StopIteration, e:
             self.rewind()
@@ -1602,6 +1607,13 @@ class QuerySet(object):
         """An alias for scalar"""
         return self.scalar(*fields)
 
+    def as_pymongo(self):
+        """Instead of returning Document instances, return raw values from
+        pymongo.
+        """
+        self._as_pymongo = True
+        return self
+
     def _sub_js_fields(self, code):
         """When fields are specified with [~fieldname] syntax, where
         *fieldname* is the Python name of a field, *fieldname* will be

tests/test_queryset.py

@@ -3691,6 +3691,22 @@ class QueryFieldListTest(unittest.TestCase):
         ak = list(Bar.objects(foo__match={'shape': "square", "color": "purple"}))
         self.assertEqual([b1], ak)
 
+    def test_as_pymongo(self):
+
+        class User(Document):
+            id = ObjectIdField('_id')
+            name = StringField()
+            age = IntField()
+
+        User.drop_collection()
+        User(name="Bob Dole", age=89).save()
+        User(name="Barack Obama", age=51).save()
+
+        users = [u for u in User.objects.only('name').as_pymongo()]
+        self.assertTrue(isinstance(users[0], dict))
+        self.assertTrue(isinstance(users[1], dict))
+        self.assertEqual(users[0]['name'], 'Bob Dole')
+        self.assertEqual(users[1]['name'], 'Barack Obama')
 
 if __name__ == '__main__':
     unittest.main()