Rails core - Apr 2014 - how to delete drop down select value in ROR

Hi, I want to display a drop down list of categories from my database, and 
I want to give a link to delete the selected category in drop down list. I 
have written the following code, but its not working, please help me out


How to delete a drop down select value by using link_to option.

*My code is:*

*index.html.erb* 

 <%= collection_select(:catvalue, :id, @catvalues, :id, :v_name, {}, class:
'drop-down')%>
 <%= link_to 'Destroy', {:catvalue => :id},method: :delete, data:
{ confirm: 'Are you sure?' } %>

and my 

*controller is:*

class CatvaluesController < ApplicationController
    def index
        @catvalue = Catvalue.new
        @catvalues = Catvalue.all
        @categories = Category.all
    end

    def destroy
        @catvalue_del = Catvalue.find(params[:id])
        @catvalue_del.destroy
        redirect_to catvalues_path
    endend

but its not working
please help me..

Thanks in advance

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