ensure_one() error op benefit_rate about hr HOT 3 CLOSED

@api.multi
def _get_amounts_now(self):
    today = context_today(self)
    for rate in self:
        rate.employee_amount = rate.get_amount(today)
        rate.employer_amount = rate.get_amount(today, employer=True)

@api.multi
def get_amount(self, date, employer=False):
    for rate in self:
        for line in rate.line_ids:
            if line.date_start <= date and (
                not line.date_end or date <= line.date_end
            ):
                return (
                    line.employer_amount if employer else
                    line.employee_amount
                )
    return False