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raja subbu 1raja subbu 1 

i am getting dml exception plz help me with this code.i created two custom objects position1__c and candidate1__c with lookup relation.when ever i update position email than corresponding candidate email should gets updated.

this is my code 

trigger trigb23 on position1__c (after update) {
     list<candidate1__c> clist=new list<candidate1__c>();
   
    for(position1__c p:trigger.new){
        
            
        list<candidate1__c> cnd=[select id,name,position1__c from candidate1__c where position1__c=:p.id];
        
        candidate1__c c=new candidate1__c();
        c.position1__c=p.Id;
        c.email__c=p.email__c;
        clist.add(c);

    }
    update clist;
    
}
Best Answer chosen by raja subbu 1
Hemant_SoniHemant_Soni
Hi Raja,
Please try below code. 
trigger trigb23 on position1__c (after update) {
    
    set<Id> setPositionId = new set<Id>();
    map<Id,Id> mapPositionIdWiseCandidateId = new map<Id,Id>();
    list<candidate1__c> clist=new list<candidate1__c>();
    
    for(position1__c p:trigger.new){
        setPositionId.add(p.Id);
    }
    if(setPositionId.size() > 0){
        for(candidate1__c oCandidate : [select id,name,position1__c from candidate1__c where position1__c IN : setPositionId]){
            mapPositionIdWiseCandidateId.put(oCandidate.position1__c, oCandidate.Id);
        }
        if(mapPositionIdWiseCandidateId.size() > 0){
            for(position1__c p:trigger.new){
                candidate1__c c = new candidate1__c();
                if(mapPositionIdWiseCandidateId.containsKey(p.id)){
                   c.Id =  mapPositionIdWiseCandidateId.get(p.Id);
                }
                c.position1__c=p.Id;
                c.email__c=p.email__c;
                clist.add(c);
            }
            if(clist.size() > 0){
                upsert clist;
            }
        }
    }
}
Thanks
Hemant

All Answers

Adilson Arcoverde JrAdilson Arcoverde Jr
Hi raja,

Well, I guess the first mistake is that you don't want to create new records (am i right?). DML exception probabily is ocorring because you are not setting ID field (required for update) for new candidate__c.

Take a look in the code below. I guess it will fulfill to your business needs:
trigger trigb23 on position1__c (after update) {
List<position1__c> positions = Trigger.new;
Map<Id,position1__c> oldMap = Trigger.oldMap;
List<position1__c> updatedPositions = new List<position1__c>();
for( position1__c p :positions ) {
// Email field has changed.
if( p.email__c != oldMap.get( p.Id ).email__c ) {
updatedPositions.add( p.Id );
}
}
list<candidate1__c> clist=new list<candidate1__c>();
Map<String,List<candidate1__c>> positionsWithCandidatesMap = new Map<String,List<candidate1__c>>();
List<candidate1__c> cnds = [select id,name,position1__c from candidate1__c where position1__c in :updatedPositions];
for( candidate1__c cnd : cnds ) {
if( !positionsWithCandidatesMap.contaisKey( cnd.position1__c ) ) {
positionsWithCandidatesMap.put( cnd.position1__c, new List<candidate1__c>() );
}
positionsWithCandidatesMap.get( cnd.position1__c ).add( cnd );
}
for( position1__c p: updatedPositions ){
List<candidate1__c> cndsToUpdate = positionsWithCandidatesMap.get( p.Id );
for( candidate1__c cndToUpdate : cndsToUpdate ) {
cndToUpdate.email__c = p.email__c;
}
clist.addAll( cndsToUpdate );
}
update clist;
}

Let me know if it helps somehow.

Regards.
raja subbu 1raja subbu 1
i want the value which i entered in position1__c to be updated in candidate1__c .why u taken old values for comparing.no need of comparision bro
Hemant_SoniHemant_Soni
Hi Raja,
Please try below code. 
trigger trigb23 on position1__c (after update) {
    
    set<Id> setPositionId = new set<Id>();
    map<Id,Id> mapPositionIdWiseCandidateId = new map<Id,Id>();
    list<candidate1__c> clist=new list<candidate1__c>();
    
    for(position1__c p:trigger.new){
        setPositionId.add(p.Id);
    }
    if(setPositionId.size() > 0){
        for(candidate1__c oCandidate : [select id,name,position1__c from candidate1__c where position1__c IN : setPositionId]){
            mapPositionIdWiseCandidateId.put(oCandidate.position1__c, oCandidate.Id);
        }
        if(mapPositionIdWiseCandidateId.size() > 0){
            for(position1__c p:trigger.new){
                candidate1__c c = new candidate1__c();
                if(mapPositionIdWiseCandidateId.containsKey(p.id)){
                   c.Id =  mapPositionIdWiseCandidateId.get(p.Id);
                }
                c.position1__c=p.Id;
                c.email__c=p.email__c;
                clist.add(c);
            }
            if(clist.size() > 0){
                upsert clist;
            }
        }
    }
}
Thanks
Hemant
This was selected as the best answer
Adilson Arcoverde JrAdilson Arcoverde Jr
Raja,

If you don't need to compare old values to new ones, just remove the condition. The new code is:
  
trigger trigb23 on position1__c (after update) {
    List<position1__c> positions = Trigger.new;
    Map<Id,position1__c> oldMap = Trigger.oldMap;
    List<position1__c> updatedPositions = new List<position1__c>();
    for( position1__c p :positions ) {
        updatedPositions.add( p.Id );
    }
    list<candidate1__c> clist=new list<candidate1__c>();
    Map<String,List<candidate1__c>> positionsWithCandidatesMap = new Map<String,List<candidate1__c>>();
    List<candidate1__c> cnds = [select id,name,position1__c from candidate1__c where position1__c in :updatedPositions];
    for( candidate1__c cnd : cnds ) {
        if( !positionsWithCandidatesMap.contaisKey( cnd.position1__c ) ) {
            positionsWithCandidatesMap.put( cnd.position1__c, new List<candidate1__c>() );
        }
        positionsWithCandidatesMap.get( cnd.position1__c ).add( cnd );
    }
    for( position1__c p: updatedPositions ){
        List<candidate1__c> cndsToUpdate = positionsWithCandidatesMap.get( p.Id );
        for( candidate1__c cndToUpdate : cndsToUpdate ) {
            cndToUpdate.email__c = p.email__c;
        }
        clist.addAll( cndsToUpdate );
    }
    update clist;
}
Regards.