[IMP] core: Deprecate cr.autocommit(True)

Since Odoo 13.0 and the refactor of the internal synchronisation between
the cache and the database, it is unsafe to use the ORM with the cursor
in autocommit mode. The function is deprecated for removal in the
future.

closes odoo/odoo#68313

Task: 2442905
Signed-off-by: Raphael Collet (rco) <rco@openerp.com>

odoo/sql_db.py

@@ -398,6 +398,11 @@ class Cursor(BaseCursor):
     @check
     def autocommit(self, on):
         if on:
+            warnings.warn(
+                "Since Odoo 13.0, the ORM delays UPDATE queries for "
+                "performance reasons. Since then, using the ORM with "
+                " autocommit(True) is unsafe, as computed fields may not be "
+                "fully computed at commit.", DeprecationWarning, stacklevel=2)
             isolation_level = ISOLATION_LEVEL_AUTOCOMMIT
         else:
             # If a serializable cursor was requested, we