[IMP] mail: add current user by default on new channel

Before this commit, when a user creates a private channel without adding himself
as a member of it, it raises an access error. After this commit, user will be
automatically added as a member by default when creating a channel.

It makes sense the creator is a member of its channel. Moreover it avoids
issues on private channels.

Task 2172420
PR odoo/odoo#44454

Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>

addons/mail/models/mail_channel.py

@@ -61,10 +61,6 @@ class Channel(models.Model):
 
     MAX_BOUNCE_LIMIT = 10
 
-    def _get_default_image(self):
-        image_path = modules.get_module_resource('mail', 'static/src/img', 'groupdefault.png')
-        return base64.b64encode(open(image_path, 'rb').read())
-
     @api.model
     def default_get(self, fields):
         res = super(Channel, self).default_get(fields)
@@ -72,6 +68,13 @@ class Channel(models.Model):
             res['alias_contact'] = 'everyone' if res.get('public', 'private') == 'public' else 'followers'
         return res
 
+    def _default_channel_last_seen_partner_ids(self):
+        return [(0, 0, {"partner_id": self.env.user.partner_id.id})]
+
+    def _get_default_image(self):
+        image_path = modules.get_module_resource('mail', 'static/src/img', 'groupdefault.png')
+        return base64.b64encode(open(image_path, 'rb').read())
+
     name = fields.Char('Name', required=True, translate=True)
     active = fields.Boolean(default=True, help="Set active to false to hide the channel without removing it.")
     channel_type = fields.Selection([
@@ -84,7 +87,7 @@ class Channel(models.Model):
     email_send = fields.Boolean('Send messages by email', default=False)
     # multi users channel
     # depends=['...'] is for `test_mail/tests/common.py`, class Moderation, `setUpClass`
-    channel_last_seen_partner_ids = fields.One2many('mail.channel.partner', 'channel_id', string='Last Seen', depends=['channel_partner_ids'])
+    channel_last_seen_partner_ids = fields.One2many('mail.channel.partner', 'channel_id', string='Last Seen', depends=['channel_partner_ids'], default=_default_channel_last_seen_partner_ids)
     channel_partner_ids = fields.Many2many('res.partner', 'mail_channel_partner', 'channel_id', 'partner_id', string='Listeners', depends=['channel_last_seen_partner_ids'])
     channel_message_ids = fields.Many2many('mail.message', 'mail_message_mail_channel_rel')
     is_member = fields.Boolean('Is a member', compute='_compute_is_member')