Fix for #1176 -- similar to https://github.com/MongoEngine/mongoengine/pull/982 but for update.

AUTHORS

@@ -239,3 +239,4 @@ that much better:
  * Joshua Nedrud (https://github.com/Neurostack)
  * Shu Shen (https://github.com/shushen)
  * xiaost7 (https://github.com/xiaost7)
+ * Victor Varvaryuk

README.rst

@@ -99,7 +99,7 @@ Some simple examples of what MongoEngine code looks like:
 Tests
 =====
 To run the test suite, ensure you are running a local instance of MongoDB on
-the standard port, and run: ``python setup.py nosetests``.
+the standard port and have installed ``nose`` and ``rednose``, and run: ``python setup.py nosetests``.
 
 To run the test suite on every supported Python version and every supported PyMongo version,
 you can use ``tox``.

docs/changelog.rst

@@ -16,6 +16,7 @@ Changes in 0.10.7 - DEV
 - Fixed AttributeError when initializing EmbeddedDocument with positional args. #681
 - Fixed no_cursor_timeout error with pymongo 3.0+ #1304
 - Replaced map-reduce based QuerySet.sum/average with aggregation-based implementations #1336
+- Fixed support for `__` to escape field names that match operators names in `update` #1351
 
 Changes in 0.10.6
 =================

mongoengine/queryset/transform.py

@@ -44,7 +44,7 @@ def query(_doc_cls=None, **kwargs):
         if len(parts) > 1 and parts[-1] in MATCH_OPERATORS:
             op = parts.pop()
 
-        # Allw to escape operator-like field name by __
+        # Allow to escape operator-like field name by __
         if len(parts) > 1 and parts[-1] == "":
             parts.pop()
 
@@ -212,6 +212,10 @@ def update(_doc_cls=None, **update):
         if parts[-1] in COMPARISON_OPERATORS:
             match = parts.pop()
 
+        # Allow to escape operator-like field name by __
+        if len(parts) > 1 and parts[-1] == "":
+            parts.pop()
+
         if _doc_cls:
             # Switch field names to proper names [set in Field(name='foo')]
             try:

tests/queryset/transform.py

@@ -224,6 +224,10 @@ class TransformTest(unittest.TestCase):
         self.assertEqual(1, Doc.objects(item__type__="axe").count())
         self.assertEqual(1, Doc.objects(item__name__="Heroic axe").count())
 
+        Doc.objects(id=doc.id).update(set__item__type__='sword')
+        self.assertEqual(1, Doc.objects(item__type__="sword").count())
+        self.assertEqual(0, Doc.objects(item__type__="axe").count())
+
     def test_understandable_error_raised(self):
         class Event(Document):
             title = StringField()