Fix #766: Add support for operator

docs/changelog.rst

@@ -5,6 +5,7 @@ Changelog
 
 Changes in 0.9.X - DEV
 ======================
+- Add support for $type operator # 766
 - Fix tests for pymongo 2.8+ #877
 - No module named 'django.utils.importlib' (Django dev) #872
 - Field Choices Now Accept Subclasses of Documents

mongoengine/queryset/transform.py

@@ -11,7 +11,7 @@ __all__ = ('query', 'update')
 
 
 COMPARISON_OPERATORS = ('ne', 'gt', 'gte', 'lt', 'lte', 'in', 'nin', 'mod',
-                        'all', 'size', 'exists', 'not', 'elemMatch')
+                        'all', 'size', 'exists', 'not', 'elemMatch', 'type')
 GEO_OPERATORS = ('within_distance', 'within_spherical_distance',
                  'within_box', 'within_polygon', 'near', 'near_sphere',
                  'max_distance', 'geo_within', 'geo_within_box',

tests/queryset/transform.py

@@ -197,5 +197,17 @@ class TransformTest(unittest.TestCase):
         update = transform.update(Location, set__poly={"type": "Polygon", "coordinates": [[[40, 5], [40, 6], [41, 6], [40, 5]]]})
         self.assertEqual(update, {'$set': {'poly': {"type": "Polygon", "coordinates": [[[40, 5], [40, 6], [41, 6], [40, 5]]]}}})
 
+    def test_type(self):
+        class Doc(Document):
+            df = DynamicField()
+        Doc(df=True).save()
+        Doc(df=7).save()
+        Doc(df="df").save()
+        self.assertEqual(Doc.objects(df__type=1).count(), 0)  # double
+        self.assertEqual(Doc.objects(df__type=8).count(), 1)  # bool
+        self.assertEqual(Doc.objects(df__type=2).count(), 1)  # str
+        self.assertEqual(Doc.objects(df__type=16).count(), 1)  # int
+
+
 if __name__ == '__main__':
     unittest.main()