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In my rjs template I''m using the following line. page.visual_effect :slideUp, ''comment_error_details'', :duration => 0.5 It works fine if I have created the div with the id="comment_error_details", but if I haven''t created the error yet then my whole rjs template fails. How can I check to see if an element has been created? I could then put

I have orders, order_items, and products. I want to collate several orders so that I can get a SUM of quantities ordered for each product etc. Can I say something like (the below gives an error on :sum, and ignores :group) OrderItem.find(:all, :sum => ''quantity'', :group => ''product_id'', :include => [:order, :product]) I want to get back a

Hi, I am currently reading the Rails Recipes book and like the chapter on providing your own in_place_editor for enumerations / selects. I understood so far, or I believe that I understood ;-), how to do that for a field that uses values only, like choosing from "red", "black", "green". What I fail to understand is how to chose from associated objects?!