保存错误：字段表达式的初始项必须是具体的 SObject：LIST

Question

我正在编写更新触发器，但收到此错误

保存错误：字段表达式的初始术语必须是具体的 SObject：LIST。

我不确定是什么原因造成的。这是我的代码

  trigger Update_Discount_on_QuoteLineItem on Quote (after update) {

List <QuoteLineItem> QLI = new List <QuoteLineItem>();
Map<id,double> MapSoftwareDiscount= new Map <id,double>();
Map<id,double> MapHardwareDiscount= new Map <id,double>();
Set <id> Qid= new Set<id>();

for (Quote  Q: Trigger.new)
{
    if (Q.Software_Discount__c!=System.Trigger.oldMap.get(Q.Id).Software_Discount__c ||Q.hardware_Discount__c!=System.Trigger.oldMap.get(Q.Id).hardware_Discount__c )
    {
        Qid.add(Q.id);
        MapSoftwareDiscount.put(Q.id,Q.Software_Discount__c);
        MapHardwareDiscount.put(Q.id,Q.hardware_Discount__c);

    }
}

QLI=[select id,QuoteId,product_category__c,Discount from QuoteLineItem where QuoteId in :Qid];
for(integer i=0; i <QLI.size();i++)
{
    if (QLI[i].product_category__c=='Software')
    {
        QLI[i].Discount=MapSoftwareDiscount.get(QLI.QuoteId); //**ERRORS OUT HERE**
    }
    else if(QLI[i].product_category__c=='Hardware')
    {
        QLI[i].Discount=MapHardwareDiscount.get(QLI.QuoteId);
    }
}
update QLI;



}

Answer 1

我明白问题出在哪里了。我应该一直使用

  QLI[i].Discount=MapSoftwareDiscount.get(QLI[i].QuoteId); 

我没有在 get(QLI[i].QuoteId) 中包含 [i]。