How to update cross object fields with bulkified trigger

Question

I have a custom object that is mirrored (Service_Order__c -> Opportunity) to when new records are created, the most part of the apex is bulkified however I am having trouble understanding how maps work and how get get the inserted ID's from Opportunity so I can update my Service_Order__c and my OpportunityContactRole objects.

Could someone explain how to get these ID's and how I update/insert the record in my trigger?

So I need to update Service_Order__c > OpportunityID__c and insert OpportunityContactRole > OpportunityID__c.

trigger MirrorOpportunity on Service_Order__c (before insert,after insert){

    Id UserId = UserInfo.getUserId();
    User user = [select AccountId, ContactId from User where id=:UserId];

    String stage = '01 - Pre-Bid';

    Stages__c s = [SELECT Id, Name, Value__c FROM Stages__c WHERE Name = :stage];
    User uO = [select id, usertype, userroleid from User where userroleid = '00ED0000001WmkV' AND IsActive=true LIMIT 1];

    list<Opportunity> oppList = new list<Opportunity>();
    list<Status_History__c> statusHistoryList = new list<Status_History__c>();
    list<OpportunityContactRole> oppContactList = new list<OpportunityContactRole>();

    for(Service_Order__c so : trigger.new) {

        if(trigger.isBefore) {

            Opportunity opp = new Opportunity();
            opp.StageName = stage;
            Date oppcloseddate = so.Project_Deadline__c;
            so.Account__c = user.AccountId;
            so.Contact__c = user.ContactId;
            opp.Name = so.Name;
            oppcloseddate = oppcloseddate.addDays(120);
            opp.CloseDate = oppcloseddate ;
            opp.LeadSource = so.Lead_Source__c;
            opp.AccountId = so.Account__c;
            so.Opp_Status__c = s.Value__c;    
            opp.Description = so.Description__c;                
            opp.Customer_Name__c = so.Customer_Name__c;

            opp.OwnerId = uO.id;
            oppList.add(opp);

            so.Opportunity__c = opp.Id;

        }

        if(trigger.isAfter) {
            Status_History__c sh = new Status_History__c();
            sh.name = s.Value__c;                
            sh.Service_Order__c =trigger.new[0].Id;
            statusHistoryList.add(sh);

            OpportunityContactRole oppContact = new OpportunityContactRole();
            oppContact.ContactId = user.ContactId;
            oppContact.IsPrimary = true;
            oppContact.OpportunityId = '';
        }

    } // end for loop

    insert oppList;
    insert statusHistoryList;
    insert oppContactList;

}

Answer 1

As for mapping, this can easily be mapped by doing something like the following:

Map<Id, list<Service_Order__c> mapSO = new Map<Id, list<Service_Order__c>();
mapSO = trigger.newMap;
set<Id> soIds = mapSO.keyset();

if(trigger.isBefore) {


   for(Id i:soIds){

      Opportunity opp = new Opportunity();
      opp.StageName = stage;
      Date oppcloseddate = mapSO.get(i).Project_Deadline__c;
      opp.Name = mapSo.get(i).Name;
      oppcloseddate = mapSO.get(i).closeddate.addDays(120);
      opp.CloseDate = oppcloseddate ;
      opp.LeadSource = mapSO.get(i).Lead_Source__c;
      opp.AccountId = mapSO.get(i).Account__c;
      opp.Description = mapSO.get(i).Description__c;                
      opp.Customer_Name__c = mapSO.get(i).Customer_Name__c;
      opp.Id = mapSO.get(i).Opportunity__c;
      opp.OwnerId = uO.id;
      oppList.add(opp);

   }

   insert(oppList); 

These lines will need fixed. You'll need to figure out how to match these up when this is bulkified.

//  so.Account__c = user.AccountId;
//  so.Contact__c = user.ContactId;
//  so.Opp_Status__c = s.Value__c;