hello everyone i haved been added an filed called employee_id, it gets the record id as the employee id computed field, it worked well when any of depending fields change but i need to run the function on all old date not while creating a new employee or i change the dependens

here is the method

@api.one
@api.depends('name')
def _compute_employee_id(self):
    for rec in self:
        rec.employee_id = rec.id
    pass

employee_id = fields.Char('Employee ID',compute='_compute_employee_id',store=True)

any help will be appreciated