I encountered an error today with a Rails Ajax drag ‘n drop and sortable list I developed for a client. Scouring the production logs, I saw:

/!\ FAILSAFE /!\  Wed Apr 16 14:19:18 -0500 2008
Status: 500 Internal Server Error
can't modify frozen string

After some Googling, I saw a couple posts in the Ruby on Rails talk Google Group. Sure enough, others were experiencing the problem, but there was no reported solution. Apparently there is even a patch in the Rails core — or at least a ticket in for the problem. But, I don’t think that is necessary, because I came up with a solution without having to patch the core. More ⊕