[FIX] base: delete linked record only if last external id

In case a record is no longer referenced in the updated module, its external id
is deleted.
If the linked record still exists, it is deleted as well.

This last clause was incorrect as the record may still be referenced in other
modules.

If a field is declared in module A

class FooA(models.Model):
    _name = 'foo'
    bar = fields.Char()

and overriden in module B

class FooB(models.Model:
    _inherit = 'foo'
    bar = fields.Char(translate=True)

In case the field is no longer inherited in module B (code change, moved to
another module,...), the ir.model.field record for bar was deleted.

Two external ids are linked to field bar:
A.field_foo__bar
B.field_foo__bar

The ir.model.field record should be dropped only if both ir.model.data entries
are no longer loaded.
Otherwise, only the ir.model.data entry should be deleted (i.e. B.field_foo__bar
in the above example).

Fixes odoo/odoo#29820

closes odoo/odoo#30018

0 files changed, 0 insertions, 0 deletions