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Trigger.newMap in Salesforce| Context Variables in Apex Triggers
Chapter Topics
- Basics of Triggers
- When to use triggers
- Types of Apex Triggers in Salesforce
- Trigger Order of Execution
- Trigger Context Variables in Salesforce
- Trigger.new in Salesforce| Context Variables in Apex Triggers
- Trigger.old in Salesforce | Context Variables in Apex Triggers
- Trigger.newMap in Salesforce| Context Variables in Apex Triggers
- Trigger.oldMap in Salesforce| Context Variables in Apex Triggers
- Trigger Exceptions
- Best Practice in Triggers
- Trigger Helper Class Pattern
Trigger.newMap in Salesforce returns a map of record IDs to the new version of sObject records, and is available in before update, after insert, after update, and after undelete triggers.
Trigger.newMap Example:
| trigger AccountTrigger on Account (before update) { Map<Id, Account> nMap = Trigger.newMap; List<Contact> cList = [SELECT LastName FROM Contact WHERE AccountId IN: nMap.keySet()]; for (Contact c : cList) { Account a = nMap.get(c.AccountId); c.MailingCity = a.BillingState; } update cList; } |
In this example, Trigger.newMap is used to access the new Account records and update related Contact records accordingly.
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