Lesson: 07 | Using Trigger Exceptions

Notes

You sometimes need to add restrictions on certain database operations, such as preventing records from being saved when certain conditions are met.

To prevent saving records in a trigger, call the addError() method on the sObject in question. The addError() method throws a fatal error inside a trigger. The error message is displayed in the user interface and is logged.

Create a trigger that prevents users to delete Accounts without a type.

trigger AccountTrigger on Account (before delete) {
    for (Account acc: Trigger.old){
        
        if(acc.Type==Null){
            
            acc.addError('You cannot delete this account.');
        }
    }
}

Create a trigger that prevents users to delete Accounts with related opportunities

Trigger AccountDeletion on Account (before delete) {

for (Account a: [SELECT id FROM Account where id in (SELECT AccountId from opportunities) AND id in :Trigger.old]) {

Trigger.oldMap.get(a.id).addError(‘Cannot delete account with related opportunities.’);

}

}

trigger AccountTestName on Account (before insert) {
    if(Trigger.new[0].Name=='America') {
		Trigger.new[0].Name.addError('Name should not be America. Try USA.');
	}

}

Exercises

#	Exercise
1	Mandatory Type Field for Opportunities
2	Account Name Validation on Creation
3	Unique Email
4	Account Name can not be changed
5	Prevents users to delete Accounts with related opportunities
6	Prevents users to change Stage Name of Won and Lost Opportunities
7	Prevent Deletion of Closed Won Opportunities
8	Prevent Deletion of Active Accounts
9	Validation rule to require Closed Lost Reason on Opportunities
10	Restrict Account deletion to System Administrators only
11	Prevent Deletion of Closed Opportunities

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Lesson: 07 | Using Trigger Exceptions

Notes

Create a trigger that prevents users to delete Accounts without a type.

Create a trigger that prevents users to delete Accounts with related opportunities

Lightning Web Components