Fixes passed in Constructor data for complexfields

Fixes #355

mongoengine/base.py

@@ -157,9 +157,11 @@ class BaseField(object):
         if isinstance(value, (list, tuple)) and not isinstance(value, BaseList):
             observer = DataObserver(instance, self.name)
             value = BaseList(value, observer)
+            instance._data[self.name] = value
         elif isinstance(value, dict) and not isinstance(value, BaseDict):
             observer = DataObserver(instance, self.name)
             value = BaseDict(value, observer)
+            instance._data[self.name] = value
         return value
 
     def __set__(self, instance, value):
@@ -749,7 +751,6 @@ class BaseDocument(object):
                 self._data[name] = value
                 if hasattr(self, '_changed_fields'):
                     self._mark_as_changed(name)
-
         super(BaseDocument, self).__setattr__(name, value)
 
     def __expand_dynamic_values(self, name, value):

tests/fields.py

@@ -516,6 +516,21 @@ class FieldTest(unittest.TestCase):
         self.assertEquals(BlogPost.objects.filter(info__100__test__exact='test').count(), 0)
         BlogPost.drop_collection()
 
+    def test_list_field_passed_in_value(self):
+        class Foo(Document):
+            bars = ListField(ReferenceField("Bar"))
+
+        class Bar(Document):
+            text = StringField()
+
+        bar = Bar(text="hi")
+        bar.save()
+
+        foo = Foo(bars=[])
+        foo.bars.append(bar)
+        self.assertEquals(repr(foo.bars), '[<Bar: Bar object>]')
+
+
     def test_list_field_strict(self):
         """Ensure that list field handles validation if provided a strict field type."""