private static function refreshRatePrices(Rate $rate)
 {
     $where['RateId'] = $rate->getId();
     $where['Done'] = 0;
     $where['Type'] = OrderType::BUY;
     $buyDeals = Deal::findBy($where);
     $where['Type'] = OrderType::SELL;
     $sellDeals = Deal::findBy($where);
     $getOnlyPrices = function ($deals) {
         return $deals['Price'];
     };
     $isUpdated = false;
     if (!empty($buyDeals)) {
         $buyPrices = array_map($getOnlyPrices, $buyDeals);
         $bid = max($buyPrices);
         if ($rate->getBid() != $bid) {
             $rate->setBid($bid);
             $rate->save();
             $isUpdated = true;
         }
     }
     if (!empty($sellDeals)) {
         $sellPrices = array_map($getOnlyPrices, $sellDeals);
         $ask = min($sellPrices);
         if ($rate->getAsk() != $ask) {
             $rate->setAsk($ask);
             $rate->save();
             $isUpdated = true;
         }
     }
     return $isUpdated;
 }