Fixing delta bug for dict fields

docs/changelog.rst

@@ -53,7 +53,7 @@ Changes in dev
 - Added reverse delete rules
 - Fixed issue with unset operation
 - Fixed Q-object bug
-- Added ``QuerySet.all_fields`` resets previous .only() and .exlude()
+- Added ``QuerySet.all_fields`` resets previous .only() and .exclude()
 - Added ``QuerySet.exclude``
 - Added django style choices
 - Fixed order and filter issue

mongoengine/base.py

@@ -721,12 +721,18 @@ class BaseDocument(object):
             field = getattr(self, field_name, None)
             if isinstance(field, EmbeddedDocument) and db_field_name not in _changed_fields:  # Grab all embedded fields that have been changed
                 _changed_fields += ["%s%s" % (key, k) for k in field._get_changed_fields(key) if k]
-            elif isinstance(field, (list, tuple)) and db_field_name not in _changed_fields:  # Loop list fields as they contain documents
+            elif isinstance(field, (list, tuple, dict)) and db_field_name not in _changed_fields:  # Loop list / dict fields as they contain documents
-                for index, value in enumerate(field):
+                # Determine the iterator to use
+                if not hasattr(field, 'items'):
+                    iterator = enumerate(field)
+                else:
+                    iterator = field.iteritems()
+                for index, value in iterator:
                     if not hasattr(value, '_get_changed_fields'):
                         continue
                     list_key = "%s%s." % (key, index)
                     _changed_fields += ["%s%s" % (list_key, k) for k in value._get_changed_fields(list_key) if k]
+
         return _changed_fields
 
     def _delta(self):
@@ -736,7 +742,6 @@ class BaseDocument(object):
         # Handles cases where not loaded from_son but has _id
         doc = self.to_mongo()
         set_fields = self._get_changed_fields()
-
         set_data = {}
         unset_data = {}
         if hasattr(self, '_changed_fields'):
@@ -775,7 +780,7 @@ class BaseDocument(object):
                 for p in parts:
                     if p.isdigit():
                         d = d[int(p)]
-                    elif hasattr(d, '__getattribute__'):
+                    elif hasattr(d, '__getattribute__') and not isinstance(d, dict):
                         real_path = d._reverse_db_field_map.get(p, p)
                         d = getattr(d, real_path)
                     else:

tests/document.py

@@ -1504,6 +1504,18 @@ class DocumentTest(unittest.TestCase):
         del(doc.embedded_field.list_field[2].list_field)
         self.assertEquals(doc._delta(), ({}, {'embedded_field.list_field.2.list_field': 1}))
 
+        doc.save()
+        doc.reload()
+
+        doc.dict_field['Embedded'] = embedded_1
+        doc.save()
+        doc.reload()
+
+        doc.dict_field['Embedded'].string_field = 'Hello World'
+        self.assertEquals(doc._get_changed_fields(), ['dict_field.Embedded.string_field'])
+        self.assertEquals(doc._delta(), ({'dict_field.Embedded.string_field': 'Hello World'}, {}))
+
+
     def test_delta_db_field(self):
 
         class Doc(Document):
@@ -1795,7 +1807,8 @@ class DocumentTest(unittest.TestCase):
         person.save()
 
         person = self.Person.objects.get()
-        self.assertTrue(person.comments_dict['first_post'].published)
+        self.assertFalse(person.comments_dict['first_post'].published)
+
     def test_delete(self):
         """Ensure that document may be deleted using the delete method.
         """