[FIX] base: proper unlink of abtract model

Context:
Since 7593b887dff4f an entry of ir.model.fields.selection is created
for each entry in a selection field. This allow a more modular
approach of tagging entries with an external id and translating
selections in the module that defined the selection (and not the one
that defined the field)

Problem:
When removing a selection, every record that used this selection is
updated with a 'set null'.
This was also intented on abstract models that do not have a table.

To reproduce:

1. create two models:

class ModelA(models.Abstract):
  _name = 'abstract.a'
  select = fields.Selection([
    ('foo', 'Foo'),
    ('bar', 'Bar'),
  ])

class ModelB(models.Model):
   _name = 'model.b'
   _inherit = 'abstract.a'

2. update code and removes the key 'foo'
3. update the module
   -> error
   psycopg2.errors.UndefinedTable: relation "abstract_a" does not exist
   LINE 1: UPDATE "abstract_a" SET "select"=NULL WHERE "re...

When updating the values in db, only update on real models

closes odoo/odoo#48288

X-original-commit: 6b20a8241300ebfc185500eb64e210db755574a8
Signed-off-by: Martin Trigaux (mat) <mat@odoo.com>
Signed-off-by: Christophe Monniez (moc) <moc@odoo.com>

0 files changed, 0 insertions, 0 deletions