Add the comment model with 1:N relationship with product

Show the list of the comments on the product page

app/models/comment.rb

@@ -0,0 +1,3 @@
+class Comment < ApplicationRecord
+  belongs_to :product
+end

app/models/product.rb

@@ -1,3 +1,5 @@
 class Product < ApplicationRecord
   has_one_attached :image
+
+  has_many :comments
 end

app/views/products/show.html.erb

@@ -14,3 +14,5 @@
     </p>
   </div>
 </div>
+
+<%= render 'shared/comments', comments: @product.comments %>

app/views/shared/_comments.html.erb

@@ -0,0 +1,22 @@
+<h3 class="my-4">Comments</h3>
+
+<div class="row">
+  <% if comments.any? %>
+    <% comments.each do |comment| %>
+      <div class="col-md-12">
+        <h3>
+          <%= comment.title %>
+        </h3>
+        <p>
+          <%= comment.description %>
+        </p>
+      </div>
+    <% end %>
+  <% else %>
+    <div class="col-md-12">
+      <p>
+        <%= t('comments.empty') %>
+      </p>
+    </div>
+  <% end %>
+</div>

config/locales/en.yml

@@ -1,33 +1,3 @@
-# Files in the config/locales directory are used for internationalization
-# and are automatically loaded by Rails. If you want to use locales other
-# than English, add the necessary files in this directory.
-#
-# To use the locales, use `I18n.t`:
-#
-#     I18n.t 'hello'
-#
-# In views, this is aliased to just `t`:
-#
-#     <%= t('hello') %>
-#
-# To use a different locale, set it with `I18n.locale`:
-#
-#     I18n.locale = :es
-#
-# This would use the information in config/locales/es.yml.
-#
-# The following keys must be escaped otherwise they will not be retrieved by
-# the default I18n backend:
-#
-# true, false, on, off, yes, no
-#
-# Instead, surround them with single quotes.
-#
-# en:
-#   'true': 'foo'
-#
-# To learn more, please read the Rails Internationalization guide
-# available at http://guides.rubyonrails.org/i18n.html.
-
 en:
-  hello: "Hello world"
+  comments:
+    empty: There aren't comments yet.

db/migrate/20190712114008_create_comments.rb

@@ -0,0 +1,11 @@
+class CreateComments < ActiveRecord::Migration[5.2]
+  def change
+    create_table :comments do |t|
+      t.string :title
+      t.text :description
+      t.integer :product_id
+
+      t.timestamps
+    end
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2019_07_12_110410) do
+ActiveRecord::Schema.define(version: 2019_07_12_114008) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -36,6 +36,14 @@
     t.index ["key"], name: "index_active_storage_blobs_on_key", unique: true
   end
 
+  create_table "comments", force: :cascade do |t|
+    t.string "title"
+    t.text "description"
+    t.integer "product_id"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+  end
+
   create_table "products", force: :cascade do |t|
     t.string "name"
     t.text "description"

test/fixtures/comments.yml

@@ -0,0 +1,11 @@
+# Read about fixtures at http://api.rubyonrails.org/classes/ActiveRecord/FixtureSet.html
+
+one:
+  title: MyString
+  description: MyText
+  product_id: 1
+
+two:
+  title: MyString
+  description: MyText
+  product_id: 1

test/models/comment_test.rb

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