How to add error message in a Salesforce Apex Trigger?

Hi Pranav,

Test__c trigObj = trigger.newMap.get(Test.id);
if(trigObj != null){
trigObj.addError('Cloned record should not have the same period as that of Parent record');
}

ApexPages.addmessage(new ApexPages.message(ApexPages.severity.FATAL,'Enter Your error message here'));

Hi,

Try this -

obj.addError(‘error’);

Hope this helps.

Hi,

This is the code snippet -

trigger AvoidDuplicateAccounts on Account (before insert, before delete)
{
Set<String> setAccountName = new Set<String>();
for(Account objAccount: [Select Name from Account])
setAccountName.add(objAccount.Name);
for(Account objAccount: Trigger.new)
{
if(!setAccountName.contains(objAccount.Name))
{
setAccountName.add(objAccount.Name);
}
else
{
objAccount.Name.addError('Account with same name Exists');
}
}
}

Hope this helps