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I am new to Apex, and I was hoping that I could get help. My goal is to auto subscribe a user to chatter on parent object. For example, I have two object, Story, and Story Task. Story is the parent object and Story task is the child. Story has the chatter feed enabled, Story Task does not. What I am trying to achieve is that if an Owner__c is populated on Story_Task__c then update the parent object Story__c chatter feed by subscribing the Story Task's Owner to the Story's chatter feed.

Here is something I have created, but not exactly sure how I can assign the owner to update the parent's chatter feed. Any pointers would be greatly appreciated. Thanks

trigger StoryTaskOwnerChatterSubscription on Story_Task__c (after insert, after undelete) {
        List<EntitySubscription> stEntitySubList = new List<EntitySubscription>();

        if(Trigger.isInsert){
            for(Story_Task__c stt:trigger.new){
                List<Story__c> story = new List<Story__c>();

                List<Story_Task__c> stask =[Select SubscriberId From Story_Task__c Where id =:story.Id];

                if(task.Owner__c != Null){
                    EntitySubscription stEntity = new EntitySubscription();
                    stEntity.ParentId = stask.Id;
                    stEntity.SubscriberId = stask.Owner__c;
                    stEntitySubList.add(stEntity);      
                }

            }

            insert stEntitySubList;
        }
}
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  • Does the trigger you have work? How does the behavior you observe differ from that you expect?
    – Adrian Larson
    Mar 20 '17 at 15:13
  • Not it does not. I essentially get a message saying that I can not perform this action as Story_Task__c does not have chatter feed enabled. This makes me think that my code is trying to assign the owner to the Story_Task_c chatter feed instead of Story's feed. That is why I am thinking that I am not specifying correctly that I want to update the parent object Story's entity subscription.
    – Ivo Dimov
    Mar 20 '17 at 15:17
  • Please include your error message here verbatim. Error message text makes your posts significantly more specific and well defined.
    – Adrian Larson
    Mar 20 '17 at 15:24
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First of all, don't query in a loop. Never.

Second, if you're trying to subscribe someone to the parent Story__c feed, you need to set that as the ParentId on the EntitySubscription record.

List<EntitySubscription> subscriptions = new List<EntitySubscription>();
for (Story_Task__c task : trigger.new)
{
    subscriptions.add(new EntitySubscription(
        ParentId = task.Story__c, SubscriberId = task.Owner__c
    ));
}
insert subscriptions;

Note that instantiating an SObject record via name=value pairs in the constructor is significantly faster than instantiating it and then setting each field individually.

You might need to add de-duplication to your approach, but I'm not entirely sure on that.

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