Can you get the User information from the @ mentions from the Chatter feed?

Question

I'm writing a trigger off the CollaborationGroupFeed object and I want to grab the @ mentions information from a post - is this possible?

I see that the post is saved in the body field and it doesn't seem as if there's a place to hold the user information from the @ mentions. However, I know that when you post to a feed with an @ mentions, you can click on that link and be directed to the User's profile. So, Chatter does know who the user is, but it doesn't look like it's stored in the table.

Does anyone have an idea on if and how this can be captured within a trigger?

Thanks in advance!

Answer 1

You can retrieve the @-mentions using Chatter in Apex. Given a FeedItem SObject called myFeedItem, you can do something like this with v28.0 of the API:

String communityId = null;
ConnectApi.FeedItem fi = ConnectApi.ChatterFeeds.getFeedItem(communityId, myFeedItem.id);
List<ConnectApi.MessageSegment> messageSegments = fi.body.messageSegments;
for (ConnectApi.MessageSegment segment : messageSegments) {
    if (segment instanceof ConnectApi.MentionSegment) {
        ConnectApi.MentionSegment mention = (ConnectApi.MentionSegment) segment;
        System.debug('Name: ' + mention.name + ', id: ' + mention.user.id);
    }
}