Tag Archives: Trigger

Handle Trigger and Validation Rule Error in Lightning Component

Sometimes we can have a requirement to display validation rule error or apex trigger error messages, on save of record in Lightning Component. We can handle those errors from apex controller and can throw messages to Lightning Component. In lightning response object though the state value comes as ERROR but the message in the error object always says ‘Internal Server Error”. Here is an example to handle the Trigger and Validation Rule Error in apex controller to show error messages in Lightning Component.

In below example I’ve used Lead object FirstName, LastName, Email & Company Field in lightning component to create record. And I’ve created a validation rule and a trigger validation on Lead object.

1. Validation rule for Company field (Company cannot be Test Company).

2. In below Trigger I’m checking if FirstName field value is “Test” then it will throw error.

trigger LeadTrigger on Lead (before insert, before update) {
    for(Lead obj :Trigger.new){
        if(obj.FirstName == 'Test'){
            obj.FirstName.addError('First name cannot be test');

Apex Controller:

public class SampleAuraController {
    Public static void createLead(Lead objLead){
        String msg = '';
            //Insert Lead Record
            insert objLead; 
        }catch(DmlException e){
            //Any type of Validation Rule error message, Required field missing error message, Trigger error message etc..
            //we can get from DmlException
            //Get All DML Messages
            for (Integer i = 0; i < e.getNumDml(); i++) {
                //Get Validation Rule & Trigger Error Messages
                msg =+ e.getDmlMessage(i) +  '\n' ;
            //throw DML exception message
            throw new AuraHandledException(msg);
        }catch(Exception e){
            //throw all other exception message
            throw new AuraHandledException(e.getMessage());
        finally {

Lightning Component:

<aura:component controller="SampleAuraController" implements="flexipage:availableForAllPageTypes,force:appHostable">
    <!--Declare Attributes-->
    <aura:attribute name="isSpinner" type="boolean" default="false"/>
    <aura:attribute name="objLead" type="Lead" default="{'sobjectType':'Lead', 
                                                        'FirstName': '',
                                                        'LastName': '',
                                                        'Email': '', 
                                                        'Company': ''}"/>
    <!--Component Start--> 
    <div class="slds-m-around--xx-large">
        <div class="container-fluid">
            <div class="form-group">
                <lightning:input name="fname" type="text" maxlength="50" required="true" label="First Name" value="{!v.objLead.FirstName}" />
            <div class="form-group">
                <lightning:input name="lname" type="text" maxlength="50" required="true" label="Last Name" value="{!v.objLead.LastName}" />
            <div class="form-group">
                <lightning:input name="emailId" type="email" maxlength="100" required="true" label="Email" value="{!v.objLead.Email}" />
            <div class="form-group">
                <lightning:input name="company" type="text" maxlength="50" required="true" label="Company" value="{!v.objLead.Company}" />
        <lightning:button variant="brand" label="Submit" onclick="{!c.handleLeadSave}" />        
        <lightning:button label="Cancel" onclick="{!c.handleCancel}"/>        
    <!--Component End-->

Lightning JS Controller:

    //Handle Lead Save
    handleLeadSave : function(component, event, helper) {
        var objLead = component.get("v.objLead");
        var action = component.get("c.createLead");
            objLead : objLead
            var state = a.getState();
            if(state === "SUCCESS"){
                alert('Record is Created Successfully');
            } else if(state === "ERROR"){
                var errors = action.getError();
                if (errors) {
                    if (errors[0] && errors[0].message) {
            }else if (status === "INCOMPLETE") {
                alert('No response from server or client is offline.');


Trigger Error Message:

Validation Rule Error Message:

Custom Rollup Summary Field Using Apex Trigger

Here is a sample Rollup Summary calculation trigger for Lookup relationship. In below example I’m using Account object as parent and Contact object as child.

I’m updating Account object Account record field Number_of_Contacts__c with Count of all related Contact records.

Apex Trigger:

trigger ContactTrigger on Contact (after insert, after update, after delete, after undelete) {
    Set<Id> accountIds = new Set<Id>();
    if(trigger.isInsert || trigger.isUpdate || trigger.isUndelete){
        for(Contact con:trigger.new){
            if(con.AccountId != null){
    if(trigger.isUpdate || trigger.isDelete){
        for(Contact con:trigger.old){
            if(con.AccountId != null){
        List<Account> accList = [SELECT Id, Number_of_Contacts__c, (SELECT Id FROM Contacts) 
                                 FROM Account WHERE Id IN : accountIds];
            List<Account> updateAccList = new List<Account>();
            for(Account acc:accList){
                Account objAcc = new Account(Id = acc.Id, Number_of_Contacts__c = acc.Contacts.size());
                update updateAccList;

Restrict multiple approval for a single user to a single record in Salesforce

I had a requirement to restrict multiple approval for a single user to a single record. There were multiple steps of approval process and the approver may be in different queue or as a manager for a user.

So, I implemented it using a trigger. In this article I’ll demonstrate how to implement it.
Here Application__c is the object, on which 3 steps approval process has implemented.
A custom check box field Check_Approver__c has set value to true, in all 3 steps field update action.

In below trigger I filtered the ProcessInstanceStep object records with current user Id in ActorId and the object Id (here object Id means record Id) in ProcessInstance.TargetObjectId.

  • If an User will approve or reject a record, then the SOQL query will return a single record.
  • If the SOQL query return a record, then trigger will throw an error message.

Trigger source code:

trigger ApplicationTrigger on Application__c (before Update)

        Id currentUserId = UserInfo.getUserId();
        for(Application__c sf: trigger.new){   
            if(sf.Check_Approver__c == true){
                List<processinstancestep> existingApprovals = [SELECT ActorId
                                    FROM ProcessInstanceStep WHERE ProcessInstance.TargetObjectId = :sf.Id
                                    AND (StepStatus = 'Approved' OR StepStatus = 'Rejected')
                                    AND ActorId = :currentUserId];
                if(existingApprovals != null){
                    if(existingApprovals.size() > 0){

                        sf.addError('You have already approved or rejeted the record.');