[FIX] partner_identification: prevent integrity error on delete ID

partner_identification/models/res_partner_id_number.py

@@ -29,7 +29,8 @@ class ResPartnerIdNumber(models.Model):
         comodel_name='res.partner.id_category',
         help="ID type defined in configuration. For example, Driver License")
     partner_id = fields.Many2one(string="Partner", required=True,
-                                 comodel_name='res.partner')
+                                 comodel_name='res.partner',
+                                 ondelete='cascade')
     partner_issued_id = fields.Many2one(
         string="Issued by", comodel_name='res.partner',
         help="Another partner, who issued this ID. For example, Traffic "

partner_identification/tests/test_partner_identification.py

@@ -20,16 +20,21 @@ class TestPartnerIdentificationBase(common.TransactionCase):
 
         partner_1 = self.env.ref('base.res_partner_1')
         self.assertEquals(len(partner_1.id_numbers), 0)
+        # create without required category
         with self.assertRaises(IntegrityError), self.cr.savepoint():
-            partner_1.write({'id_numbers': [(0, 0,  {
+            partner_1.write({'id_numbers': [(0, 0, {
                 'name': '1234',
             })]})
-        partner_1.write({'id_numbers': [(0, 0,  {
+        # successful creation
+        partner_1.write({'id_numbers': [(0, 0, {
             'name': '1234',
             'category_id': partner_id_category.id
         })]})
         self.assertEquals(len(partner_1.id_numbers), 1)
         self.assertEquals(partner_1.id_numbers.name, '1234')
+        # delete
+        partner_1.write({'id_numbers': [(5, 0, 0)]})
+        self.assertEquals(len(partner_1.id_numbers), 0)
 
 
 class TestPartnerCategoryValidation(common.TransactionCase):