add taskaddition

polls/models.py

@@ -70,6 +70,13 @@ class Task(models.Model):
         ordering = ["-added"]
 
 
+MESSAGE_TYPE_CHOICES = (
+    (0, 'url'),
+    (1, 'file'),
+    (2, 'picture')
+)
+
+
 class TaskAddition(models.Model):
     id = models.UUIDField('id', primary_key=True, default=uuid.uuid4)
     task = models.ForeignKey(Task, on_delete=models.CASCADE)
@@ -115,13 +122,6 @@ class Message(models.Model):
         return self.send_from + ':' + self.send_to
 
 
-MESSAGE_TYPE_CHOICES = (
-    (0, 'url'),
-    (1, 'file'),
-    (2, 'picture')
-)
-
-
 class MessageAddition(models.Model):
     id = models.UUIDField('id', primary_key=True, default=uuid.uuid4)
     category = models.IntegerField(