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avimeir Problem with triggers + relationships
Hi,
I have an object that creates association of two custom objects: Reservation and Room. I am trying to do something when a new association is created. This is the code I have:
trigger handleNewRoomResaAssociation on ReservationRoomAssociation__c (after insert) {
for (ReservationRoomAssociation__c assoc : Trigger.New)
{
System.debug(assoc.Room__r.Name);
}
}
The debug returns null, as if there is no Room__c object associated. What am I doing wrong?
Thanks
You probably need to store these in a map keyed by the id so that you can retrieve the appropriate record. Something like:
Map<Id, Room__c> rooms=new Map<Id, Room__c>(); List<Id> roomIds=new List<Id>(); for (ReservationRoomAssociation__c assoc : Trigger.New) { roomIds.add(assoc.Room__c); } rooms.putAll([select id, Name from Room__c where id in :roomIds]; for (ReservationRoomAssociation__c assoc : Trigger.new) { Room__c room=rooms.get(assoc.Room__c); System.debug(room.Name); }All Answers
If you need values from related records you have to query those back yourself. The record in the trigger will only have the ID field populated in assoc.Room__c.
How do I do this?
Been struggling with related fields for 2 days now and I am starting to go crazy :P
You probably need to store these in a map keyed by the id so that you can retrieve the appropriate record. Something like:
Map<Id, Room__c> rooms=new Map<Id, Room__c>(); List<Id> roomIds=new List<Id>(); for (ReservationRoomAssociation__c assoc : Trigger.New) { roomIds.add(assoc.Room__c); } rooms.putAll([select id, Name from Room__c where id in :roomIds]; for (ReservationRoomAssociation__c assoc : Trigger.new) { Room__c room=rooms.get(assoc.Room__c); System.debug(room.Name); }