[FIX] core: writing on one2many field on new record

When using command "6" (SET), the one2many field's inverse was not
assigned on the lines.

closes odoo/odoo#65675

X-original-commit: ba733a9ac73dcf978ed7eaab7681781b2d5a9bfc
Signed-off-by: Raphael Collet (rco) <rco@openerp.com>

odoo/addons/test_new_api/tests/test_new_fields.py

@@ -1693,6 +1693,13 @@ class TestFields(TransactionCaseWithUserDemo):
         self.assertFalse(new_move.line_ids.id)
         self.assertEqual(new_move.line_ids.quantity, 2)
 
+        # assign line to new move without origin
+        new_move = move.new()
+        new_move.line_ids = line
+        self.assertFalse(new_move.line_ids.id)
+        self.assertEqual(new_move.line_ids._origin, line)
+        self.assertEqual(new_move.line_ids.move_id, new_move)
+
     @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

@@ -3428,11 +3428,14 @@ class One2many(_RelationalMulti):
                         browse([command[1]])[inverse] = False
                     elif command[0] == Command.LINK:
                         browse([command[1]])[inverse] = recs[-1]
-                    elif command[0] in (Command.CLEAR, Command.SET):
+                    elif command[0] == Command.CLEAR:
+                        cache.update(recs, self, itertools.repeat(()))
+                    elif command[0] == Command.SET:
                         # assign the given lines to the last record only
-                        cache.update(recs, self, [()] * len(recs))
-                        lines = comodel.browse(command[2] if command[0] == Command.SET else [])
-                        cache.set(recs[-1], self, lines._ids)
+                        cache.update(recs, self, itertools.repeat(()))
+                        last, lines = recs[-1], browse(command[2])
+                        cache.set(last, self, lines._ids)
+                        cache.update(lines, inverse_field, itertools.repeat(last.id))
 
         else:
             def link(record, lines):