When I track the old value and new value in the trigger, the first value showing has null, I don't know how to void it .. 
I have used if ( Trigger.isbefore  &&  Trigger.isUpdate) also I condition it doesn't work.
 

if ( Trigger.isbefore )
         for(integer i=0; i<trigger.new.size();i++){
        
            if(Trigger.New[i].Decision_Determined__c!=Trigger.Old[i].Decision_Determined__c){
                
                if(Trigger.Old[i].Plaid_Report_JSON__c==null){
                    Trigger.New[i].Plaid_Report_JSON__c='';
                }
              
                Trigger.New[i].Plaid_Report_JSON__c +='\n Decision old value='+Trigger.Old[i].Decision_Determined__c+  ' Decision New value ' + Trigger.New[i].Decision_Determined__c;
                  }
}
    system.debug('-----old value'+Trigger.Old);
    system.debug('-----new value'+Trigger.New);

Hello ,

I have a requirement where i need to show a modal/popup/ toast message whenever a lead status is changed to working. When a status is changed to working at that time only that popup or modal or message should be displayed.
Title - Your lead is in working status now.
Plese help me in order to cater this requirement.Thanks in advance
 

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I am using process builder to update child records from a parent object. But its not updating records of one specific customer child object. However when in same  process builder I am trying to update another objects child records  then its getting update. Any idea, is there any limitation to update child records in some scenario. 
In action type I am selecting update records and then in Select a Record to Update I can see child object suffixed with __r, then I am selecting the column and assigning the required value but its not working.
Same scenario I applied for another object and its working fine.