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2 changes: 2 additions & 0 deletions odoo/addons/base/models/ir_model.py
Original file line number Diff line number Diff line change
Expand Up @@ -221,6 +221,8 @@ def unlink(self):
# prevent screwing up fields that depend on these models' fields
model.field_id._prepare_update()

# OpenUpgrade: always remove relations to this model (fix issue #3649)
self.env['ir.model.relation'].search([('model', 'in', self.ids)]).unlink()
# delete fields whose comodel is being removed
self.env['ir.model.fields'].search([('relation', 'in', self.mapped('model'))]).unlink()

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