Category: Trigger

This post is part of the series – Design Pattern in ApexI know it was discussed number of times earlier about Apex Trigger Design Pattern. Below are few excellent posts -http://gokubi.com/archives/two-interesting-ways-to-architect-apex-triggershttp://www.embracingthecloud.com/2010/07/08/ASimpleTriggerTemplateForSalesforce.aspxI have learned a lot from the above two posts by Steve Andersen and Mike Leach.But the post by Abhinav Gupta really inspires me a lot and I am going to explain the pattern/template here with few use cases.The motivations for this design pattern are -Write Trigger with minimum codeFollow Salesforce Best Practice – One Trigger per objectFollow another Salesforce Best Practice – Move all code from Trigger to Apex Classes – Handler ClassesAbility to add and order multiple handlers for the same trigger event.Easy to maintain code base.Here is the Apex Trigger template – MyTriggers (Again inspired by Abhinav Gupta)Now using the above template, below is the account trigger handler – AccountTriggerHandlerAnd finally the trigger – AccountTriggerNow the trigger code is very neat and clean. At the same time all our operations against trigger events are moved to handler class.So now let’s consider few use cases -Use Case 1 -While inserting new accounts, if the Account Rating is marked as ‘Hot’, then mark those accounts as Active and make the Customer Priority as ‘Medium’.Implementation -To implement the above requirement, what we need to do is simply add the functionality in AccountTriggerHandler.AccountBeforeInsertHandler class. No changes in Apex trigger code is required.Here is the updated AccountTriggerHandlerUse...