private function makeRate($carmodel, $subcomponent, $repairshop, $amount)
{
$rate = Rate::firstOrNew(['carmodel_id' => $carmodel->carmodel_id, 'subcomponent_id' => $subcomponent->subcomponent_id, 'repairshop_id' => $repairshop->repairshop_id]);
$rate->amount = $amount;
$rate->carmodel()->associate($carmodel);
$rate->subcomponent()->associate($subcomponent);
$rate->repairshop()->associate($repairshop);
$rate->save();
return $rate;
}
