[FIX] mass_mailing: allow duplicating mailing contact from mailing list

Before this commit:
While trying to duplicate a mailing contact within particular
mailing list, it  throws an user error saysing that 'A mailing
contact cannot subscribe to the same mailing list multiple times.'

After this commit:
User can duplicate a mailing contact from a mailing list without
the user error. In this case, we simply remove the default_list_ids
from the context, because all the mailing lists will be simply be
copied over from the existing contact and so we don't have to
re-add the default ones.

closes odoo/odoo#66827

Task-id: 2431344
Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/addons/mass_mailing/models/mailing_contact.py b/addons/mass_mailing/models/mailing_contact.py
index 5d74fd511f9..27ce87a24ff 100644
--- a/addons/mass_mailing/models/mailing_contact.py
+++ b/addons/mass_mailing/models/mailing_contact.py
@@ -140,6 +140,15 @@ class MassMailingContact(models.Model):
 
         return super(MassMailingContact, self.with_context(default_list_ids=False)).create(vals_list)
 
+    @api.returns('self', lambda value: value.id)
+    def copy(self, default=None):
+        """ Cleans the default_list_ids while duplicating mailing contact in context of
+        a mailing list because we already have subscription lists copied over for newly
+        created contact, no need to add the ones from default_list_ids again """
+        if self.env.context.get('default_list_ids'):
+            self = self.with_context(default_list_ids=False)
+        return super().copy(default)
+
     @api.model
     def name_create(self, name):
         name, email = self.get_name_email(name)