Fix #595: Support += and *= for ListField

docs/changelog.rst

@@ -5,6 +5,10 @@ Changelog
 
 Changes in 0.9.X - DEV
 ======================
+- Support += and *= for ListField #595
+
+Changes in 0.9.0
+================
 - Update FileField when creating a new file #714
 - Added `EmbeddedDocumentListField` for Lists of Embedded Documents. #826
 - ComplexDateTimeField should fall back to None when null=True #864

mongoengine/base/datastructures.py

@@ -156,6 +156,14 @@ class BaseList(list):
         self = state
         return self
 
+    def __iadd__(self, other):
+        self._mark_as_changed()
+        return super(BaseList, self).__iadd__(other)
+
+    def __imul__(self, other):
+        self._mark_as_changed()
+        return super(BaseList, self).__imul__(other)
+
     def append(self, *args, **kwargs):
         self._mark_as_changed()
         return super(BaseList, self).append(*args, **kwargs)

tests/fields/fields.py

@@ -946,6 +946,18 @@ class FieldTest(unittest.TestCase):
             BlogPost.objects.filter(info__0__test__exact='5').count(), 0)
         self.assertEqual(
             BlogPost.objects.filter(info__100__test__exact='test').count(), 0)
+
+        post = BlogPost()
+        post.info = ['1', '2']
+        post.save()
+        post = BlogPost.objects(info=['1', '2']).get()
+        post.info += ['3', '4']
+        post.save()
+        self.assertEqual(BlogPost.objects(info=['1', '2', '3', '4']).count(), 1)
+        post = BlogPost.objects(info=['1', '2', '3', '4']).get()
+        post.info *= 2
+        post.save()
+        self.assertEqual(BlogPost.objects(info=['1', '2', '3', '4', '1', '2', '3', '4']).count(), 1)
         BlogPost.drop_collection()
 
     def test_list_field_passed_in_value(self):