I'm trying to overwrite delete method with log information into the db:

def post_write(self, cr, uid, ids, action, model, context=None):
    if isinstance(ids, (int, long)):
      ids = [ids]
    queue = self.pool.get("hr.changes.queue")
    for id in ids:
        queue.create(self, cr, uid, {
            "action": action,
            "related_model": model,
            "affected_id": id
        })

def unlink(self, cr, uid, ids, context=None):
    self.post_write(self, cr, uid, ids, "delete", "hr.employee")
    return super(hr_employee, self).unlink(cr, uid, ids)

but I have this error: "'hr.employee' object has no attribute 'execute'"