Quote Before Trigger that gets Value from Opp and Writes it to the Quote

gistfile1.txt

//written by Bobby Watson
public void OnBeforeInsert(Quote [] newQuotes){
    
        Set<Id> opportunitiesToQuery = new Set<Id>();
        // Loop over the new quotes and grab the opportunities they are associated to.
        for (Quote q : newQuotes) {
            opportunitiesToQuery.add(q.OpportunityId);
        }
        
        // Now we have a collection of opportunity IDs to query. So let's query for them.
        // We'll store the results in a Map keyed by Opportunity ID so we can grab the correct one for each quote.
        Map<Id, Opportunity> opps = new Map<Id, Opportunity([SELECT Id, EnergyEngineer__c FROM Opportunity WHERE id =:opportunitiesToQuery]);
        
        for (Quote q : newQuotes) {
            // Since we already did a query for all opportunities, now we just need to grab the one for the current quote.                  
            Opportunity o = opps.get(q.OpportunityId);
            
            // We should check to make sure an opportunity record was actually found first.
            if (o != null) {
                q.Energy_Engineer__c = o.EnergyEngineer__c;
            }
        }
    }