The cost you should get when you get to the controller... Just send
the id of the product and find the cost when you get to the
controller...
About the quantity, not sure about the observer but I just added a
remote_form that has the quantity property:
<% remote_form_for :quantity, :url => { :controller =>
"carts", :action => :add, :id => @product.id },
:complete => visual_effect(:highlight, 'floating_cart') do |f| -%>
<%= f.select :quantity, (1..5) %>
<%= image_submit_tag("../images/add_to_cart.png", :class =>
"submit_tag") %>
<% end %>
This is for the cart model... adding a product to the cart...
item.update_attributes({ :amount => item.amount + quantity,
:price => product.price,
:weight => product.weight})
cart_items << item
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