Sign Up ›

Browse by Topic
ShowAll Questionssorted byDate Posted
+ Start a Discussion
bookerawardbookeraward 

How to write a trigger one object with value in another object when two objects have no relation?

I am trying to write a trigger that fires when my custom object "Vehicles" is either updated or new record is inserted.

If any of its two particular fields (In_service__c, Manufacturer__c)have been updated or new record has been inserted, then I want to compare these values to the fields Name__c and Subscriber__c of my custom object "Company".

If the values of the two fields in “Vehicles” match with the fields in “Company”, then assign the value in the field 
Channel__c.Vehicles = Group__c.Company
This is what I have so far: 
trigger VehicleUpdate on Vehicle_custom_object__c (before insert, before update){
    map<id, string, string> vehicleIDs = new map<id, string,string>();
      for(Vehicle_custom_object__c v: trigger.new){
        // ?? vehicleIDs.add(v.Vehicle_ID__c);(it should now have a collection of all ID's and also the values od the two fields which I am trying to compare with
       }
      Map<Id, Company__c> mapOfCompanies = new Map<Id,Company__c>();
      for (Company__c comp: [select  Name, Subscriber__c from Company__c where ??
       //this is where I am stuck at
       //if the values of Name__c.Company and Subscriber__c.Company match with the values of In_service__c.Vehicle and Vehicle.Manufacturer__c
      //then Vehicle.Channel__c = Company.Group__c

Thanks for your help.
Shashikant SharmaShashikant Sharma
Hi,

1. For this you have to create a set of values that will go in where clause

like in this case one would be

Set<String> setCompanyName = new Set<String>();

2. then loop over Vehicle_custom_object__c list

for(Vehicle_custom_object__c vObj : trigger.new){
// populate the setCompanyName  appropriately
        if( vObj.FieldAPIName__c != null ) {
         setCompanyName.add( vObj.FieldAPIName__c );
       }
}

3. then do SOQL on the object that you want to fetch with a Where clause on the field which you want to compare, use in clause for set setCompanyName like

Where FieldToCompare__c in: setCompanyName 

4. Loop over the list returned by SOQL and prepare a map

Map<String, Object__c> mapNameToRecord = new Map<String, Object__c>();

in above Object__c will be the name of object that you queries

5. then loop over Vehicle_custom_object__c list again and use the map to find value of Object in step 4

for(Vehicle_custom_object__c vObj : trigger.new){
      if( vObj.FieldAPIName__c != null ) {
            if( mapNameToRecord.containsKey( vObj.FieldAPIName__c )) {
            // find related object based on value
           Object__c obj = mapNameToRecord.get( vObj.FieldAPIName__c );
           }
      }
}


Let me know if you have queries in above.
bookerawardbookeraward
Hello Shahikant, thanks for your reply.
I am trying to compare two fields of one custom object with the fields of another custom object with no relationship between the two objects.
As I understand your code,it  only takes one field for comparison?
My question is how to make it work for more than one field.
Thank-you
Shashikant SharmaShashikant Sharma
You could create another map for the other field and check contacins condition for that as well. Based on your need you could have OR ( || ) or AND ( && ) operators between both the conditions.

Thanks
Shashikant