Comment controller, list and create form were created

app/assets/javascripts/comments.js.coffee

@@ -0,0 +1,3 @@
+# Place all the behaviors and hooks related to the matching controller here.
+# All this logic will automatically be available in application.js.
+# You can use CoffeeScript in this file: http://coffeescript.org/

app/assets/stylesheets/comments.css.scss

@@ -0,0 +1,3 @@
+// Place all the styles related to the Comments controller here.
+// They will automatically be included in application.css.
+// You can use Sass (SCSS) here: http://sass-lang.com/

app/controllers/comments_controller.rb

@@ -0,0 +1,15 @@
+class CommentsController < ApplicationController
+
+  def create
+    @article = Article.find(params[:article_id])
+    @comment = @article.comments.create(comment_params)
+    redirect_to article_path(@article)
+  end
+
+private
+
+  def comment_params
+    params.require(:comment).permit(:commenter, :body)
+  end
+
+end

app/helpers/comments_helper.rb

@@ -0,0 +1,2 @@
+module CommentsHelper
+end

app/views/articles/show.html.erb

@@ -10,5 +10,34 @@
   <%= @article.text %>
 </p>
 
+<h2>Comments</h2>
+<% @article.comments.each do |comment| %>
+    <p>
+      <strong>Commenter:</strong>
+      <%= comment.commenter %>
+    </p>
+
+    <p>
+      <strong>Comment:</strong>
+      <%= comment.body %>
+    </p>
+<% end %>
+
+<h2>Add a comment:</h2>
+
+<%= form_for([@article, @article.comments.build]) do |f| %>
+    <p>
+      <%= f.label :commenter %><br>
+      <%= f.text_field :commenter %>
+    </p>
+    <p>
+      <%= f.label :body %><br>
+      <%= f.text_area :body %>
+    </p>
+    <p>
+      <%= f.submit %>
+    </p>
+<% end %>
+
 <%= link_to 'Back', articles_path %>
 | <%= link_to 'Edit', edit_article_path(@article) %>

config/routes.rb

@@ -1,7 +1,9 @@
 Rails.application.routes.draw do
   get 'welcome/index'
 
-  resources :articles
+  resources :articles do
+    resources :comments
+  end
 
   # The priority is based upon order of creation: first created -> highest priority.
   # See how all your routes lay out with "rake routes".

test/controllers/comments_controller_test.rb

@@ -0,0 +1,7 @@
+require 'test_helper'
+
+class CommentsControllerTest < ActionController::TestCase
+  # test "the truth" do
+  #   assert true
+  # end
+end

test/helpers/comments_helper_test.rb

@@ -0,0 +1,4 @@
+require 'test_helper'
+
+class CommentsHelperTest < ActionView::TestCase
+end