I just need the method as I can't figure that out.

This is what I am trying to do.

shared/_comment.html.erb uses a method display_name.  The object
comment.commentator will be an instance of Reader which will need to be
modified to
have this method, which will be their first name and last name
concatenated together.

I want to be able to comment on an image and for it to display their
name.

Thanks in advance