i have this python function to make 'holiday_status_id' field change dynamically ..
i want to add this function to action 'hr_holidays.open_allocation_holidays'

@api.onchange('employee_id')
def change_leave_type(self):
    for holiday_type in self:
        if holiday_type.env.uid == holiday_type.user_id.id and not holiday_type.env.user.has_group('hr_holidays.group_hr_holidays_user'):
            allocate_type = holiday_type.env['hr.holidays.status'].search([('name', '=', 'Compensatory Days')]).id
            return {'domain': {'holiday_status_id':[('id', '=', allocate_type)]}}
        elif holiday_type.env.user.has_group('hr_holidays.group_hr_holidays_user') and not holiday_type.env.user.has_group('hr_holidays.group_hr_holidays_manager'):
            ids = []
            allocation_types = holiday_type.env['hr.holidays.status'].search([])
            for allocate in allocation_types:
                if allocate.name != 'Unpaid':
                    ids.append(allocate.id)
            return {'domain': {'holiday_status_id':[('id', '=', ids)]}}