[FIX] website_slides: various models improvements

Purpose of this commit is to fix and improve some model related bits of
code:

 * add an ondelete cascade on some required fields;
 * make a public method private because it should be accessed only through
   controllers;
 * do not add odoobot as channel member; notably for demo data it can create
   unnecessary of noise in members and notifications;

Commit linked to task ID 1941250 and PR #31453

addons/website_slides/controllers/main.py

@@ -776,7 +776,7 @@ class WebsiteSlides(WebsiteProfile):
         try:
             slide = request.env['slide.slide'].browse(slide_id)
             if is_embedded:
-                request.env['slide.embed'].sudo().add_embed_url(slide.id, referrer_url)
+                request.env['slide.embed'].sudo()._add_embed_url(slide.id, referrer_url)
             values = self._get_slide_detail(slide)
             values['page'] = page
             values['is_embedded'] = is_embedded

addons/website_slides/models/slide_channel.py

@@ -280,8 +280,8 @@ class Channel(models.Model):
 
     @api.model
     def create(self, vals):
-        # Ensure creator is member of its channel it is easier for him to manage it
-        if not vals.get('channel_partner_ids'):
+        # Ensure creator is member of its channel it is easier for him to manage it (unless it is odoobot)
+        if not vals.get('channel_partner_ids') and not self.env.user._is_superuser():
             vals['channel_partner_ids'] = [(0, 0, {
                 'partner_id': self.env.user.partner_id.id
             })]

addons/website_slides/models/slide_slide.py

@@ -24,21 +24,22 @@ class SlidePartnerRelation(models.Model):
     _table = 'slide_slide_partner'
 
     slide_id = fields.Many2one('slide.slide', ondelete="cascade", index=True, required=True)
-    channel_id = fields.Many2one('slide.channel', string="Channel", related="slide_id.channel_id", store=True, index=True)
-    partner_id = fields.Many2one('res.partner', index=True, required=True)
+    channel_id = fields.Many2one(
+        'slide.channel', string="Channel",
+        related="slide_id.channel_id", store=True, index=True, ondelete='cascade')
+    partner_id = fields.Many2one('res.partner', index=True, required=True, ondelete='cascade')
     vote = fields.Integer('Vote', default=0)
     completed = fields.Boolean('Completed')
-
-    quiz_attempts_count = fields.Integer(string="Number of times this user attempted the quiz")
+    quiz_attempts_count = fields.Integer('Quiz attempts count', default=0)
 
 
 class SlideLink(models.Model):
     _name = 'slide.slide.link'
     _description = "External URL for a particular slide"
 
-    slide_id = fields.Many2one('slide.slide', required=True)
+    slide_id = fields.Many2one('slide.slide', required=True, ondelete='cascade')
     name = fields.Char('Title', required=True)
-    link = fields.Char("External Link", required=True)
+    link = fields.Char('External Link', required=True)
 
 
 class EmbeddedSlide(models.Model):
@@ -51,8 +52,10 @@ class EmbeddedSlide(models.Model):
     url = fields.Char('Third Party Website URL', required=True)
     count_views = fields.Integer('# Views', default=1)
 
-    def add_embed_url(self, slide_id, url):
+    def _add_embed_url(self, slide_id, url):
         baseurl = urls.url_parse(url).netloc
+        if not baseurl:
+            return 0
         embeds = self.search([('url', '=', baseurl), ('slide_id', '=', int(slide_id))], limit=1)
         if embeds:
             embeds.count_views += 1