comment path undefined

_product.html.erb

      <tr>
        <td><%= product.name %></td>
        <td><%= product.description %></td>
        <td><%= product.image_url %></td>
        <td><%= product.colour %></td>
        <td><%= link_to 'Show', product %></td>
        <td><% if signed_in? && current_user.admin? %>
              <%= link_to 'Edit', edit_product_path(product) %>
            <% end %>
        </td>
        
        <td><% if signed_in? && current_user.admin? %>
              <%= link_to ('<span class="glyphicon glyphicon-remove"</span>').html_safe, product_comment_path(@product, comment), method: :delete, data: { confirm: 'Are you quite sure?' } %>
            <% end %></td>
      </tr>

error.txt

Showing /home/ubuntu/workspace/app/views/products/_product.html.erb where line #13 raised:

undefined local variable or method `comment' for #<#<Class:0x00000004c4a140>:0x000000046aa500>
Extracted source (around line #13):
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        <td><% if signed_in? && current_user.admin? %>
              <%= link_to ('<span class="glyphicon glyphicon-remove"</span>').html_safe, product_comment_path(@product, comment), method: :delete, data: { confirm: 'Are you quite sure?' } %>
            <% end %></td>
      </tr>

products_controller.rb

class ProductsController < ApplicationController
  before_action :set_product, only: [:show, :edit, :update, :destroy]
  before_filter :authenticate_user!
  
  # GET /products
  # GET /products.json
  def index
    if params[:q]
      search_term = params[:q]
      @products = Product.where("name LIKE ?", "%#{search_term}%")
    else
      @products = Product.all.paginate(page: params[:page], per_page: 5)
    end
  end

  # GET /products/1
  # GET /products/1.json
  def show
    @comments = @product.comments.all.order("created_at DESC").paginate(page: params[:page], per_page: 3) 
  end

  # GET /products/new
  def new
    @product = Product.new
  end

  # GET /products/1/edit
  def edit
  end

  # POST /products
  # POST /products.json
  def create
    @product = Product.new(product_params)

    respond_to do |format|
      if @product.save
        format.html { redirect_to @product, notice: 'Product was successfully created.' }
        format.json { render :show, status: :created, location: @product }
      else
        format.html { render :new }
        format.json { render json: @product.errors, status: :unprocessable_entity }
      end
    end
  end

  # PATCH/PUT /products/1
  # PATCH/PUT /products/1.json
  def update
    respond_to do |format|
      if @product.update(product_params)
        format.html { redirect_to @product, notice: 'Product was successfully updated.' }
        format.json { render :show, status: :ok, location: @product }
      else
        format.html { render :edit }
        format.json { render json: @product.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /products/1
  # DELETE /products/1.json
  def destroy
    @product.destroy
    respond_to do |format|
      format.html { redirect_to products_url, notice: 'Product was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_product
      @product = Product.find(params[:id])
    end

    # Never trust parameters from the scary internet, only allow the white list through.
    def product_params
      params.require(:product).permit(:name, :description, :image_url, :colour)
    end
end

routes.rb

Rails.application.routes.draw do
  
  devise_for :users, :path => '', :path_names => {:sign_in => 'login', :sign_out => 'logout'}
  resources :users
  controller :static_pages do
    get :home
    get :about
    get :contact
  end
  
  post 'static_pages/thank_you'
  #get 'thank_you' => 'static_pages#thank_you'
  get 'landing_page' => 'static_pages#landing_page'
  get 'featured_page' => 'static_pages#featured_page'
  get 'contact' => 'static_pages#contact'
  get 'about' => 'static_pages#about'
  
  #get 'users/index' => 'users#index'
  #get 'users/show' => 'users#show[:id]'
  
  
  
    
  #get '/products', to: 'products#new' #redirected products url to orders, for fun!
  
  resources :products do 
    resources :comments
  end
    # created with scaffolding - shows all default CRUD routes


  # The priority is based upon order of creation: first created -> highest priority.
  # See how all your routes lay out with "rake routes".

  # You can have the root of your site routed with "root"
  root 'static_pages#index'

  # Example of regular route:
  #   get 'products/:id' => 'catalog#view'

  # Example of named route that can be invoked with purchase_url(id: product.id)
  #   get 'products/:id/purchase' => 'catalog#purchase', as: :purchase
  resources :orders, only: [:index, :show, :new, :create]

  # Example resource route (maps HTTP verbs to controller actions automatically):
  #   resources :products

  # Example resource route with options:
  #   resources :products do
  #     member do
  #       get 'short'
  #       post 'toggle'
  #     end
  #
  #     collection do
  #       get 'sold'
  #     end
  #   end

  # Example resource route with sub-resources:
  #   resources :products do
  #     resources :comments, :sales
  #     resource :seller
  #   end

  # Example resource route with more complex sub-resources:
  #   resources :products do
  #     resources :comments
  #     resources :sales do
  #       get 'recent', on: :collection
  #     end
  #   end

  # Example resource route with concerns:
  #   concern :toggleable do
  #     post 'toggle'
  #   end
  #   resources :posts, concerns: :toggleable
  #   resources :photos, concerns: :toggleable

  # Example resource route within a namespace:
  #   namespace :admin do
  #     # Directs /admin/products/* to Admin::ProductsController
  #     # (app/controllers/admin/products_controller.rb)
  #     #   end
end