Hi, I have a Currency model with id, name and exchange_rate attributes. I have multiple select boxes for currencies in a form. These can be added dynamically through JS too. Im using an observe_field to make an Ajax call to the action "currency_name" and retrieve the selected currency from the database using the id. Following this Ajax call, currency_name.rjs is rendered where i update the "selected_currencies" div with the currency name and amount(which is the exchange_rate * some_value). In case a previously chosen currency is chosen again, only the amount should get updated. But if a new currency is chosen, "selected_currencies" should get appended with the new currency's name and amount. To accomplish this condition checking, I thought of having an instance @selected_taxes which is an array of arrays (like [["currency1_id","currency1_name","currency1_rate"], ["currency2_id","currency2_name","currency2_rate"] , ...] ) OR an array of arrays of hashes (which carry the appropriate keys for the values). But this array seems to refresh on every Ajax call. I've paste the controller code below def currency_name @chosen_currencies ||=  flag = 0 @currency = Currency.find(params[:currency_id]) @chosen_currencies.each do |id| if (@currency.id == id) flag = 1 end end @chosen_currencies << @currency.id unless (flag == 1) raise @chosen_currencies.to_yaml end This results in the instance having only one ID at a time. Firstly, is my approach correct? Or is there a better way? And secondly, if my approach is correct, how can i maintain this instance over multiple Ajax calls? Hope someone can help me out with this.
on 2009-01-08 07:51