[FIX] mass_mailing_partner: Fix partner merge error (dupplicate mass_mailing contacts)

mass_mailing_partner/readme/CONTRIBUTORS.rst

@@ -9,5 +9,6 @@
     * Ernesto Tejeda
     * Victor M.M. Torres
     * Manuel Calero
+    * Víctor Martínez
 
 * `Hibou Corp. <https://hibou.io>`_

mass_mailing_partner/tests/test_mail_mass_mailing_contact.py

@@ -108,3 +108,35 @@ class MailMassMailingContactCase(base.BaseCase):
         contact.partner_id = partner
         contact._onchange_partner_mass_mailing_partner()
         self.check_mailing_contact_partner(contact)
+
+    def test_partners_merge(self):
+        partner_1 = self.create_partner({"name": "Demo 1", "email": "demo1@demo.com"})
+        partner_2 = self.create_partner({"name": "Demo 2", "email": "demo2@demo.com"})
+        list_1 = self.create_mailing_list({"name": "List test 1"})
+        list_2 = self.create_mailing_list({"name": "List test 2"})
+        contact_1 = self.create_mailing_contact(
+            {
+                "email": partner_1.email,
+                "name": partner_1.name,
+                "partner_id": partner_1.id,
+                "list_ids": [(6, 0, [list_1.id])],
+            }
+        )
+        contact_2 = self.create_mailing_contact(
+            {
+                "email": partner_2.email,
+                "name": partner_2.name,
+                "partner_id": partner_2.id,
+                "list_ids": [(6, 0, [list_1.id, list_2.id])],
+            }
+        )
+        # Wizard partner merge (partner_1 + partner_2) in partner_i1
+        wizard = self.env["base.partner.merge.automatic.wizard"].create(
+            {"state": "option"}
+        )
+        wizard._merge((partner_1 + partner_2).ids, partner_1)
+        contact = self.env["mailing.contact"].search(
+            [("id", "in", (contact_1 + contact_2).ids)]
+        )
+        self.assertEqual(len(contact), 1)
+        self.assertEqual(contact.list_ids.ids, (list_1 + list_2).ids)

mass_mailing_partner/wizard/__init__.py

@@ -1,3 +1,4 @@
 # License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
 
 from . import partner_mail_list_wizard
+from . import partner_merge

mass_mailing_partner/wizard/partner_merge.py

@@ -0,0 +1,25 @@
+# Copyright 2020 Tecnativa - Víctor Martínez
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+
+from odoo import models
+
+
+class BasePartnerMergeAutomaticWizard(models.TransientModel):
+    _inherit = "base.partner.merge.automatic.wizard"
+
+    def _merge(self, partner_ids, dst_partner=None, extra_checks=True):
+        if dst_partner:
+            contacts = self.env["mailing.contact"].search(
+                [("partner_id", "in", partner_ids)]
+            )
+            if contacts:
+                contacts = contacts.sorted(
+                    lambda x: 1 if x.partner_id == dst_partner else 0
+                )
+                list_ids = contacts.mapped("list_ids").ids
+                contacts[1:].unlink()
+                contacts[0].partner_id = dst_partner
+                contacts[0].list_ids = [(4, x) for x in list_ids]
+        return super()._merge(
+            partner_ids, dst_partner=dst_partner, extra_checks=extra_checks
+        )