title: Rails - Get Params like "cart_item[price]=5%2C70€" out of URL
body: <p>My View make a redirect an pass the Params </p>
  
  <blockquote>
    <p>?cart_item[price]=5%2C70€</p>
  </blockquote>
  
  <p>.
  I try to get this with </p>
  
  <blockquote>
    <p>@price = [:cart_item][:price]</p>
  </blockquote>
  
  <p>, but there i get the error "can't convert Symbol into Integer".
  I try it with codes like ":cart_item_price" or ":cart_item.price" but always no variable was founded</p>
  
  <p>How can i get this price in my other action ? </p>