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What is difference between Trigger new and Trigger old?
When a field value is changed to certain value, we use trigger. new to compare the older and new version values of the field values on a record and perform the required business logic accordingly. trigger. old is available only on the update and delete events.
What is difference between Trigger new and Trigger newMap?
trigger. new is simply a list of the records being processed by the trigger, so if all you need to do is loop through them then you can use that. trigger. newMap just allows you to target specific records by Id should you not need to process everything, or if you need to map other records back to these.
How to update before trigger in Salesforce developer community?
In the above code you are specificalluy pointing to Contact record with id=0039000000Mehth. When trigger excutes, it will take into the consideration all the records which meet criteria, like here we have Before Update; so any contact record which will get updated will fire the trigger and then the description will be updated.
Can You update the contact record before trigger?
Above code is updating the Contact record in it’s before trigger but the statement in the book says something else. Please explain. It means you can not do any dml like update or delete for the object on which you are writing trigger. Your trigger is updating the contact itself.
Why does apex Trigger Update a custom field?
OK, this one is a little more complicated for two reasons: first we need to “bulkify” the code, which means that we have to assume that multiple records are being inserted/updated all at once and we have to code accordingly, and second we have to have some way of identifing which records in object2 need to be updated.
What happens when you update a contact in Salesforce?
Your trigger is updating the contact itself. The Salesforce guide says, if you are creating a new record (child) on inser/update event (on parent) which in turn is updating the parent, then it will throw the error. You can try the account – contact trigger as mentioned in the description to validate it.