Ruby on Rails

hello, everyone.
I'm studying rails with version 2.3.5, but I got a problem just now.
I wrote code like:

<td><%= link_to 'Delete', :action => 'remove_from_cart', :id =>
cart_item %></td>

and I write that method like this.
def remove_from_cart
@cart = find_cart
remove_item = params[:id]
redirect_to_index
end
unfortunately i found that remove_item isn't my CardItem class but a
String. how could this happen? and how could i get cart_item in my
remove_from_cart method by rewritng my code?

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