Apex コードに Salesforce データを使用する

//Create the class
  public class OrderItemUtility {
  
      //Create the method that will add free bonus bouquet when order is activated
      public static void addBonusBouquet(List<Order> ordersFromTrigger) {
      
          //TO DO 3.1: Determine if we have a bonus product and get its ID to add to the order
          // Use SOQL to get the ID of the bonus bouquet and store it in an sObject variable called bonusProduct
          List<Product2> bonusProductList = [SELECT Id, ProductCode FROM Product2 WHERE ProductCode = 'BOT-BB-12'];
          Product2 bonusProduct = new Product2();
          if(bonusProductList.size() > 0) {
              bonusProduct = bonusProductList[0];
  
              // Use SOQL to get the price book entry ID associated with the bonusProduct and store it in an sObject variable called entry
              // Every Product has an assosiated PricebookEntry
              List<PricebookEntry> entryList = [SELECT Id, Product2Id FROM PricebookEntry WHERE Product2Id = :bonusProduct.Id];
              PricebookEntry entry = new PricebookEntry();
              if(entryList.size() > 0) {
                  entry = entryList[0];
              }
      
              //TO DO 2.1: Create a list to store any new bouquets we'll insert later
              List<OrderItem> newBouquets = new List<OrderItem>();
          
              //TO DO 2.2: Loop over orders in ordersFromTrigger, for each order (called currentOrder) do something
              for(Order currentOrder : ordersFromTrigger) {
              
                  //TO DO 2.3: Verify the order status is 'Activated'
                  if(currentOrder.Status == 'Activated') {
                  
                      //TO DO 2.4: Create a new bouquet and set values
                      OrderItem freeBouquet = new OrderItem(
                          OrderId = currentOrder.id, //this is the order we're linking the bouquet to
                          PricebookEntryId = entry.id,
                          numberOfFlowers__c = 3,
                          description = 'FREE Bouquet',
                          Quantity = 1,
                          colorTheme__c = 'Spectacular Sunset',
                          percentOfOpening__c = 0,
                          UnitPrice = 0.00
                      );
                      
                      //TO DO 2.5: Add the freeBouquet sObject to your list
                      newBouquets.add(freeBouquet);
                      
                  //TO DO 2.6: Close the "if" and "for loop" sections
                  } //end if
              } //end for loop
              
              //TO DO 3.2: Use DML to add the new bouquet to the Order
              insert newBouquets;
              
          //TO DO 3.3: Close the if section
          } //end if
      } //end method
  } //end class