I have been going through the book tutorial verbatim, and ran into the same problem. I fixed it a different way, by commenting out this line, which the book has you add while creating db.py:
db.comment.image_id.writable = db.comment.image_id.readable = False This now allows 'Comments' links to show up in the manage page. However, the book says that this line was used to prevent image_id from showing up in all other forms, which it does now. So, as a web2py newbie, what's the proper way to fix this, and don't display image_id in the default CRUD form for the image table? Probably needs to be updated in the book. :) Thanks! Lanae --

