Custom Object and Chatter Insert Trigger Creation

Question

I have a trigger on a custom object trigger cTrigger on C__c(after insert, after update) that works correctly when a new C__c is created. C__c also has Chatter posts enabled and I am trying to write a trigger that runs when a new Chatter post is made on any specific C__c object. Any help is appreciated. I have searched through the documentation and triggers of this type are not mentioned.

Answer 1

Assuming you want to write trigger on Chatter Posts made on specific records, what you want is to write a trigger on FeedItem object. You can find more on the documentation here.

FeedItem represents an entry in the feed, such as changes in a record feed, including text posts, link posts, and content posts.

The Record Id of the C__c record where this post is being made will be available in the feed item trigger by accessing the ParentId field. You can process anything further related to the original record once you capture the parent id.

Parent Id of the Feed Item is described in the documentation as:

ID of the object type to which the FeedItem object is related. For example, set this field to a UserId to post to someone’s profile feed, or an AccountId to post to a specific account.

Also refer to the considerations while writing trigger on chatter objects, which can be found at this link.