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I have triggers on FeedItem and FeedComment where I need to dynamically read a field on their respective Parents (ParentId).

For FeedItem I can do (for example):

FeedItem.Parent.get('Name');

But for FeedComment, which seems analogous in most respects

FeedComment.Parent.get('Name');

does not work, and the Force.com IDE Schema doesn't seem to help me out. Is there no way of getting for example the FeedComment Account Name without an SOQL query?

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    Have you tried going through the feed item. FeedComment is a child of FeedItem, which is the child of the record in question. So shouldn't it be FeedComment.FeedItem.Parent.get()?
    – pchittum
    Sep 2, 2013 at 23:42
  • FeedComment.FeedItem gives "Invalid foreign key relationship: FeedComment.FeedItem"
    – George S.
    Sep 3, 2013 at 12:45

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Of course, I found that to get the Parent info in a trigger context I had to use an SOQL query.

But then, I found that even 

FeedItem.Parent.get('Name');

doesn't work, since it is a polymorphic field. See here for a description of the problem, and here for a potential solution in the future.

So, I use the method FeedComment.ParentId.getSobjecttype() to get the object to describe. A complication is that the field to dynamically get may or may not be present in the org, and so I have to query non-statically, and catch any QueryException caused by the field not being present. Not ideal, but it seems to work.

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