[FIX] rating: allow rating deletion

Purpose of this commit is to

  * delete rating when deleting message. Otherwise rating coming from
    frontend portal review chatter are lost in the void;
  * allow system users to delete ratings;

Task ID 2058595
PR #36281

addons/rating/models/rating.py

@@ -50,7 +50,10 @@ class Rating(models.Model):
         ('highly_dissatisfied', 'Highly dissatisfied'),
         ('no_rating', 'No Rating yet')], string='Rating', store=True, compute='_compute_rating_text', readonly=True)
     feedback = fields.Text('Comment', help="Reason of the rating")
-    message_id = fields.Many2one('mail.message', string="Linked message", help="Associated message when posting a review. Mainly used in website addons.", index=True)
+    message_id = fields.Many2one(
+        'mail.message', string="Linked message",
+        index=True, ondelete='cascade',
+        help="Associated message when posting a review. Mainly used in website addons.")
     access_token = fields.Char('Security Token', default=_default_access_token, help="Access token to set the rating of the value")
     consumed = fields.Boolean(string="Filled Rating", help="Enabled if the rating has been filled.")
 

addons/rating/security/ir.model.access.csv

@@ -2,3 +2,4 @@ id,name,model_id:id,group_id:id,perm_read,perm_write,perm_create,perm_unlink
 access_rating_user,rating.rating.user,rating.model_rating_rating,base.group_user,1,1,1,0
 access_rating_public,rating.rating.public,rating.model_rating_rating,base.group_public,1,1,1,0
 access_rating_portal,rating.rating.portal,rating.model_rating_rating,base.group_portal,1,1,1,0
+rating_rating_access_system,rating.rating.access.system,rating.model_rating_rating,base.group_system,1,1,1,1