Added rounding for unicode return value of to_mongo in DecimalField. Closes #1103

AUTHORS

@@ -242,3 +242,4 @@ that much better:
  * xiaost7 (https://github.com/xiaost7)
  * Victor Varvaryuk
  * Stanislav Kaledin (https://github.com/sallyruthstruik)
+ * Dmitry Yantsen (https://github.com/mrTable)

docs/changelog.rst

@@ -7,6 +7,7 @@ Changes in 0.10.8
 - Added ability to specify an authentication mechanism (e.g. X.509) #1333
 - Added support for falsey primary keys (e.g. doc.pk = 0) #1354
 - Fixed BaseQuerySet#sum/average for fields w/ explicit db_field #1417
+- Fixed absent rounding for DecimalField when `force_string` is set. #1103
 
 Changes in 0.10.7
 =================

mongoengine/fields.py

@@ -341,7 +341,7 @@ class DecimalField(BaseField):
         if value is None:
             return value
         if self.force_string:
-            return unicode(value)
+            return unicode(self.to_python(value))
         return float(self.to_python(value))
 
     def validate(self, value):