[IMP] im_livechat: make channel use rating parent mixin

No functionnal changes are done in this commit. Even
the period of rating to take into account to compute
livechat channel satisfaction (introduced at
5b60e05ce4)
stays the same, but use the parent mixin mecanism.

Task-1903565

addons/im_livechat/models/im_livechat_channel.py

@@ -3,10 +3,10 @@
 import base64
 import random
 import re
-from datetime import datetime, timedelta
 
 from odoo import api, fields, models, modules, tools
 
+
 class ImLivechatChannel(models.Model):
     """ Livechat Channel
         Define a communication channel, which can be accessed with 'script_external' (script tag to put on
@@ -15,7 +15,9 @@ class ImLivechatChannel(models.Model):
     """
 
     _name = 'im_livechat.channel'
+    _inherit = ['rating.parent.mixin']
     _description = 'Livechat Channel'
+    _rating_satisfaction_days = 7  # include only last 7 days to compute satisfaction
 
     def _default_image(self):
         image_path = modules.get_module_resource('im_livechat', 'static/src/img', 'default.png')
@@ -39,9 +41,6 @@ class ImLivechatChannel(models.Model):
         compute='_are_you_inside', store=False, readonly=True)
     script_external = fields.Text('Script (external)', compute='_compute_script_external', store=False, readonly=True)
     nbr_channel = fields.Integer('Number of conversation', compute='_compute_nbr_channel', store=False, readonly=True)
-    rating_percentage_satisfaction = fields.Integer(
-        '% Happy', compute='_compute_percentage_satisfaction', store=False, default=-1,
-        help="Percentage of happy ratings over the past 7 days")
 
     # images fields
     image = fields.Binary('Image', default=_default_image, attachment=True,
@@ -60,7 +59,6 @@ class ImLivechatChannel(models.Model):
     channel_ids = fields.One2many('mail.channel', 'livechat_channel_id', 'Sessions')
     rule_ids = fields.One2many('im_livechat.channel.rule', 'channel_id', 'Rules')
 
-
     @api.one
     def _are_you_inside(self):
         self.are_you_inside = bool(self.env.uid in [u.id for u in self.user_ids])
@@ -88,19 +86,6 @@ class ImLivechatChannel(models.Model):
         for record in self:
             record.nbr_channel = len(record.channel_ids)
 
-    @api.multi
-    @api.depends('channel_ids.rating_ids')
-    def _compute_percentage_satisfaction(self):
-        for record in self:
-            dt = fields.Datetime.to_string(datetime.utcnow() - timedelta(days=7))
-            repartition = record.channel_ids.rating_get_grades([('create_date', '>=', dt)])
-            total = sum(repartition.values())
-            if total > 0:
-                happy = repartition['great']
-                record.rating_percentage_satisfaction = ((happy*100) / total) if happy > 0 else 0
-            else:
-                record.rating_percentage_satisfaction = -1
-
     @api.model
     def create(self, vals):
         tools.image_resize_images(vals)
@@ -211,7 +196,6 @@ class ImLivechatChannelRule(models.Model):
     _description = 'Livechat Channel Rules'
     _order = 'sequence asc'
 
-
     regex_url = fields.Char('URL Regex',
         help="Regular expression specifying the web pages this rule will be applied on.")
     action = fields.Selection([('display_button', 'Display the button'), ('auto_popup', 'Auto popup'), ('hide_button', 'Hide the button')],