1.1.2 fix dublicates subscribe_for_user

SubscribesApp/models.py

@@ -78,4 +78,17 @@ class SubscribeForUser(BaseModel):
 
         if not res:
             res += f' {str(self.id)}'
-        return res
+        return res
+
+    def activate(self):
+        self.enable = True
+        self.save(update_fields=['enable'])
+
+        subscribes_for_user = SubscribeForUser.objects.filter(
+            user=self.user
+        ).exclude(
+            id=self.id
+        )
+        subscribes_for_user.update(enable=False)
+
+        return self