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Catching Error to be Displayed on Redirected Page

/ Published in: Ruby
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Catches an exception error, uses a technique called flash to display error on another page.

The Ruby on Rails code needs to be in a controller.

The rhtml code needs to be in the index layout.

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Copy this code and paste it in your HTML 
  1. def add_to_cart
  2.   begin
  3.     product = Product.find(params[:id])
  4.   # if can not find product id, catch exception, raise error to be
  5.   # displayed on 'index' page
  6.   rescue ActiveRecord::RecordNotFound
  7.     logger.error("Atempt to access invalid product #{params[:id]}")
  8.     flash[:notice] = "invalid product"
  9.     redirect_to :action => :index
  10.   else
  11.   # if can find product id, continue to add product to cart
  12.     @cart = find_cart
  13.     @cart.add_product(product)
  14.   end
  15. end
  16.  
  17. # RHTML code
  18. <% if flash[:notice] -%>
  19. 	<div id="notice"><%= flash[:notice] %></div>
  20. <% end -%>

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