[FIX] core: update of one2many field on new record with origin

An onchange method can remove an existing line from a one2many field of
a new record with command 2, such as:

    move.line_ids = [(2, <NewId origin=42>), ...]

The processing of the command 2 above incorrectly tries to remove the
new line from the origin record, instead of the new record.

closes odoo/odoo#54545

X-original-commit: 7d138a445acbd9f2e122d9c30ca81877bae6a245
Signed-off-by: Raphael Collet (rco) <rco@openerp.com>

odoo/addons/test_new_api/tests/test_new_fields.py

@@ -1473,6 +1473,22 @@ class TestFields(TransactionCaseWithUserDemo):
         self.assertEqual(new_move.quantity, 3)
         self.assertEqual(move.quantity, 2)
 
+    def test_41_new_one2many(self):
+        """ Check command on one2many field on new record. """
+        move = self.env['test_new_api.move'].create({})
+        line = self.env['test_new_api.move_line'].create({'move_id': move.id, 'quantity': 1})
+        move.flush()
+
+        new_move = move.new(origin=move)
+        new_line = line.new(origin=line)
+        self.assertEqual(new_move.line_ids, new_line)
+
+        # drop line, and create a new one
+        new_move.line_ids = [(2, new_line.id), (0, 0, {'quantity': 2})]
+        self.assertEqual(len(new_move.line_ids), 1)
+        self.assertFalse(new_move.line_ids.id)
+        self.assertEqual(new_move.line_ids.quantity, 2)
+
     @mute_logger('odoo.addons.base.models.ir_model')
     def test_41_new_related(self):
         """ test the behavior of related fields starting on new records. """

odoo/fields.py

@@ -2638,9 +2638,13 @@ class Many2one(_Relational):
         """ Remove `records` from the cached values of the inverse fields of `self`. """
         cache = records.env.cache
         record_ids = set(records._ids)
+
+        # align(id) returns a NewId if records are new, a real id otherwise
+        align = (lambda id_: id_) if all(record_ids) else (lambda id_: id_ and NewId(id_))
+
         for invf in records._field_inverses[self]:
             corecords = records.env[self.comodel_name].browse(
-                id_ for id_ in cache.get_values(records, self)
+                align(id_) for id_ in cache.get_values(records, self)
             )
             for corecord in corecords:
                 ids0 = cache.get(corecord, invf, None)