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--- a/ForgeTracker/forgetracker/model/issue.py
+++ b/ForgeTracker/forgetracker/model/issue.py
@@ -57,7 +57,7 @@
 
 
 
-class Comment0(Document):
+class Comment0(Message):
 
     class __mongometa__:
         name = 'issue_comment'
@@ -98,7 +98,7 @@
 
 
 
-class Attachment0(Document):
+class Attachment0(Message):
 
     class __mongometa__:
         name = 'issue_attachment'