Still, I need a way with the great code that you and Justin have supplied to update a 'third' field in the join record. What I have is a join record that does a HATBM with 'races' and 'tshirts'. Our clients want to be able to assign different tshirt sizes from a pick list (which I've put into the DB) and possibly have a 'price adder' for large or special shirts.

With your code above is there an easy way to pass in an array of 'price adder' fields (most of which will be zero) and then pass them into the join record in the controller on create or update?

Would it be something like…

params[:race][:tshirt_ids].merge(:price_addr => params[:price_addr][]) ||= []

…? I'm assuming I would create an array somehow in the view of price_addr[], similar to tshirt_ids (over my head here). The code above won't work, because I'm mixing type String with Array in the merge(), but I'm guessing if it can be done its a short bit of code.

Thanks,
Mark

How would you set a 'third field' in the join record? We are doing sign-ups for races, and I've taken your example and created a race_tshirts join table. I want to add a 'price_adder' field in the join table for larger or special tshirts. Any suggestions would be very helpful.

Mark

Thanks again!