repair adding messages

JoinTheCityREST/app/Discussion/models.py

@@ -24,8 +24,7 @@ class Discussion(models.Model):
         return self.question
 
     def add_message(self, user, text):
-        message = TextMessage.objects.create()
-        message.user = user
-        message.text = text
+        message = TextMessage.objects.create(user=user, text=text)
+        message.save()
         self.messages.add(message)
         self.save()
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