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Salesforce, Apex

Trigger: Adding Related Records

This trigger adds a related opportunity for each new or updated account if no opportunity is already associated with the account. The trigger first performs a SOQL query to get all child opportunities for the accounts that the trigger fired on. Next, the trigger iterates over the list of sObjects in Trigger.New to get each account sObject. If the account doesn’t have any related opportunity sObjects, the for loop creates one. If the trigger created any new opportunities, the final statement inserts them.

Using Trigger Exceptions

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.

The following trigger prevents the deletion of an account if it has related opportunities. By default, deleting an account causes a cascade delete of all its related records. This trigger prevents the cascade delete of opportunities. Try this trigger for yourself! If you’ve executed the previous example, your org has an account called Apples & Oranges with a related opportunity. This example uses that sample account.

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