Having Trouble Deleting a Value from a Collect_Select box in Rails 3.2 -

i trying implement delete button/link on views/admin_lookups/index.html.erb page.

i able create new value , save category list , category collection_select box.

can't delete work though. i've gotten routing errors template errors.

application contains admin_lookup model , category model

here code far:

views/admin_lookups/index.html.erb

<%= form_for @admin_lookup |f| %>   <div class="field">     <%= f.label(:category_id, :class => "control-label") %>      <div class="controls">       <%= f.collection_select(:category_id, category.all, :id, :name, prompt: true) %>   </div>     </div>  <% end %>  <% @categories.each |category| %>    <ul id="category">     <%= category.name %>   </ul>    <% end %>  <%= form_for @category |f| %> <%= f.label :name, "new name" %><br> <%= f.text_field :name %> <%= f.submit %>   **here trying implement delete link**  <%= link_to 'delete', @category, remote: true, method: :delete %>   <% end %> 

admin_lookups_controller.rb

class adminlookupscontroller < applicationcontroller   def index      @admin_lookups = adminlookup.all     @admin_lookup = adminlookup.new     @category = category.new     @categories = category.all   # @category = category.destroy     .... 

categories_controller.rb

class categoriescontroller < applicationcontroller   def create     @category = category.new(params[:category])     @category.save     render nothing: true   end   def index      @categories = category.all     render nothing: true   end   def destroy      @category = category.find(params[:id])     @category.destroy     render nothing: true   end end 

views/admin_lookups/destroy.js.erb

 $("select option[value=<%= @category.id %>]").remove() 

here updated code:

views/admin_lookups/index.html.erb

<%= form_for :category, method: :delete, :url => categories_path, remote: true |f| %>   <div class="field">     <%= f.label(:category_id, :class => "control-label") %>      <div class="controls">       <%= f.collection_select(:id, category.all, :id, :name, prompt: true) %>   </div>     </div>  <%= f.submit "delete category value" %>   <% end %>  <% @categories.each |category| %>    <ul id="category">     <%= category.name %>   </ul>    <% end %>  <%= form_for @category |f| %> <%= f.label :name, "new name" %><br> <%= f.text_field :name %> <%= f.submit %>  <% end %> 

routes.rb

resources :categories   collection      delete :index, to: 'categories#destroy'   end end 

categories_controller.rb

class categoriescontroller < applicationcontroller   def create     @category = category.new(params[:category])     @category.save     render nothing: true   end   def index      @categories = category.all      respond_to |format|        format.js {}     end   end   def destroy      @category = if params[:id].present?       category.find(params[:id])     elsif params[:category].present?       category.find(params[:category][:id])     end     @category.destroy   end  end 

views/categories/destroy.js.erb

 $("select option[value=<%= @category.id %>]").remove()