Add user(creator) to discussion model

JoinTheCityREST/app/Discussion/models.py

@@ -14,6 +14,8 @@ class TextMessage(models.Model):
         return self.text
 
 class Discussion(models.Model):
+    user = models.ForeignKey(User, related_name='user_creator_of_discussion',
+                             blank=False, null=False, default=None)
     question = models.CharField(max_length=100)
     message = models.ManyToManyField(TextMessage, blank=True, null=True, related_name="conversations_participant")
     tag = models.ForeignKey(Tag, related_name='place_of_discussion', blank=False, null=False, default=None)