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Gemfile

@@ -33,6 +33,7 @@ gem 'betterlorem'
 
 group :development, :test do
   gem 'rspec-rails', '~> 3.5'
+  gem 'shoulda'
 end
 
 group :development, :test do

Gemfile.lock

@@ -138,6 +138,12 @@ GEM
       sprockets (>= 2.8, < 4.0)
       sprockets-rails (>= 2.0, < 4.0)
       tilt (>= 1.1, < 3)
+    shoulda (3.5.0)
+      shoulda-context (~> 1.0, >= 1.0.1)
+      shoulda-matchers (>= 1.4.1, < 3.0)
+    shoulda-context (1.2.2)
+    shoulda-matchers (2.8.0)
+      activesupport (>= 3.0.0)
     spring (2.0.0)
       activesupport (>= 4.2)
     spring-watcher-listen (2.0.1)
@@ -184,6 +190,7 @@ DEPENDENCIES
   rails (~> 5.0.0, >= 5.0.0.1)
   rspec-rails (~> 3.5)
   sass-rails (~> 5.0)
+  shoulda
   spring
   spring-watcher-listen (~> 2.0.0)
   turbolinks (~> 5)

app/assets/javascripts/comments.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.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 +1,74 @@
+class CommentsController < ApplicationController
+  before_action :set_comment, only: [:show, :edit, :update, :destroy]
+
+  # GET /comments
+  # GET /comments.json
+  def index
+    @comments = Comment.all
+  end
+
+  # GET /comments/1
+  # GET /comments/1.json
+  def show
+  end
+
+  # GET /comments/new
+  def new
+    @comment = Comment.new
+  end
+
+  # GET /comments/1/edit
+  def edit
+  end
+
+  # POST /comments
+  # POST /comments.json
+  def create
+    @comment = Comment.new(comment_params)
+
+    respond_to do |format|
+      if @comment.save
+        format.html { redirect_to @comment, notice: 'Comment was successfully created.' }
+        format.json { render :show, status: :created, location: @comment }
+      else
+        format.html { render :new }
+        format.json { render json: @comment.errors, status: :unprocessable_entity }
+      end
+    end
+  end
+
+  # PATCH/PUT /comments/1
+  # PATCH/PUT /comments/1.json
+  def update
+    respond_to do |format|
+      if @comment.update(comment_params)
+        format.html { redirect_to @comment, notice: 'Comment was successfully updated.' }
+        format.json { render :show, status: :ok, location: @comment }
+      else
+        format.html { render :edit }
+        format.json { render json: @comment.errors, status: :unprocessable_entity }
+      end
+    end
+  end
+
+  # DELETE /comments/1
+  # DELETE /comments/1.json
+  def destroy
+    @comment.destroy
+    respond_to do |format|
+      format.html { redirect_to comments_url, notice: 'Comment was successfully destroyed.' }
+      format.json { head :no_content }
+    end
+  end
+
+  private
+    # Use callbacks to share common setup or constraints between actions.
+    def set_comment
+      @comment = Comment.find(params[:id])
+    end
+
+    # Never trust parameters from the scary internet, only allow the white list through.
+    def comment_params
+      params.require(:comment).permit(:body, :author, :product_id)
+    end
+end

app/helpers/comments_helper.rb

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

app/models/comment.rb

@@ -0,0 +1,5 @@
+class Comment < ApplicationRecord
+  validates :body, presence: true
+
+  belongs_to :product
+end

app/views/comments/_comment.json.jbuilder

@@ -0,0 +1,2 @@
+json.extract! comment, :id, :body, :author, :product_id, :created_at, :updated_at
+json.url comment_url(comment, format: :json)

app/views/comments/_form.html.erb

@@ -0,0 +1,32 @@
+<%= form_for(comment) do |f| %>
+  <% if comment.errors.any? %>
+    <div id="error_explanation">
+      <h2><%= pluralize(comment.errors.count, "error") %> prohibited this comment from being saved:</h2>
+
+      <ul>
+      <% comment.errors.full_messages.each do |message| %>
+        <li><%= message %></li>
+      <% end %>
+      </ul>
+    </div>
+  <% end %>
+
+  <div class="field">
+    <%= f.label :body %>
+    <%= f.text_area :body %>
+  </div>
+
+  <div class="field">
+    <%= f.label :author %>
+    <%= f.text_field :author %>
+  </div>
+
+  <div class="field">
+    <%= f.label :product_id %>
+    <%= f.text_field :product_id %>
+  </div>
+
+  <div class="actions">
+    <%= f.submit %>
+  </div>
+<% end %>

app/views/comments/edit.html.erb

@@ -0,0 +1,6 @@
+<h1>Editing Comment</h1>
+
+<%= render 'form', comment: @comment %>
+
+<%= link_to 'Show', @comment %> |
+<%= link_to 'Back', comments_path %>

app/views/comments/index.html.erb

@@ -0,0 +1,31 @@
+<p id="notice"><%= notice %></p>
+
+<h1>Comments</h1>
+
+<table>
+  <thead>
+    <tr>
+      <th>Body</th>
+      <th>Author</th>
+      <th>Product</th>
+      <th colspan="3"></th>
+    </tr>
+  </thead>
+
+  <tbody>
+    <% @comments.each do |comment| %>
+      <tr>
+        <td><%= comment.body %></td>
+        <td><%= comment.author %></td>
+        <td><%= comment.product %></td>
+        <td><%= link_to 'Show', comment %></td>
+        <td><%= link_to 'Edit', edit_comment_path(comment) %></td>
+        <td><%= link_to 'Destroy', comment, method: :delete, data: { confirm: 'Are you sure?' } %></td>
+      </tr>
+    <% end %>
+  </tbody>
+</table>
+
+<br>
+
+<%= link_to 'New Comment', new_comment_path %>

app/views/comments/index.json.jbuilder

@@ -0,0 +1 @@
+json.array! @comments, partial: 'comments/comment', as: :comment

app/views/comments/new.html.erb

@@ -0,0 +1,5 @@
+<h1>New Comment</h1>
+
+<%= render 'form', comment: @comment %>
+
+<%= link_to 'Back', comments_path %>

app/views/comments/show.html.erb

@@ -0,0 +1,19 @@
+<p id="notice"><%= notice %></p>
+
+<p>
+  <strong>Body:</strong>
+  <%= @comment.body %>
+</p>
+
+<p>
+  <strong>Author:</strong>
+  <%= @comment.author %>
+</p>
+
+<p>
+  <strong>Product:</strong>
+  <%= @comment.product %>
+</p>
+
+<%= link_to 'Edit', edit_comment_path(@comment) %> |
+<%= link_to 'Back', comments_path %>

app/views/comments/show.json.jbuilder

@@ -0,0 +1 @@
+json.partial! "comments/comment", comment: @comment

config/routes.rb

@@ -1,5 +1,6 @@
 Rails.application.routes.draw do
 
+  resources :comments
   root 'products#index'
 
   resources :products

db/migrate/20161108180841_create_comments.rb

@@ -0,0 +1,11 @@
+class CreateComments < ActiveRecord::Migration[5.0]
+  def change
+    create_table :comments do |t|
+      t.text :body
+      t.string :author
+      t.references :product, foreign_key: true
+
+      t.timestamps
+    end
+  end
+end

db/schema.rb

@@ -10,11 +10,20 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20161107221656) do
+ActiveRecord::Schema.define(version: 20161108180841) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
 
+  create_table "comments", force: :cascade do |t|
+    t.text     "body"
+    t.string   "author"
+    t.integer  "product_id"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["product_id"], name: "index_comments_on_product_id", using: :btree
+  end
+
   create_table "products", force: :cascade do |t|
     t.float    "price"
     t.string   "name"
@@ -23,4 +32,5 @@
     t.datetime "updated_at",  null: false
   end
 
+  add_foreign_key "comments", "products"
 end