upgrade-inherit-read (U2029)

Code reads ._inherit at runtime, which raises in Odoo 20.0.

Applies to Odoo 20.0 and later.

What it does

Reports reads of x._inherit, such as "mail.thread" in self._inherit.

Why is this bad?

Odoo 20.0 raises AttributeError on runtime reads of _inherit (the class attribute in a class body is fine). Test the class instead: isinstance(self, self.env.registry["mail.thread"]).