My error (Noob!) - the model for C had set attr_protected for the B_id field. So Rails was doing exactly as I instructed it. I found this by reviewing the development log, which included a warning that B_id was protected against mass updates.
Thanks all. On Mar 16, 3:13 pm, Frederick Cheung <[email protected]> wrote: > On Mar 16, 5:47 pm, ander31415 <[email protected]> wrote: *** CUT *** > > Hard to say without seeing what you're actually doing. I know you've > deliberately not posted code, but without code, unless your basic > premise is fundamentally flawed it's just guesswork. > > Fred -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.

