Generate the Article model and add to index view

Add an Article model to match the previously created ArticlesController

* Generate the Article model with title:string and body:text attributes.
* Run the generated migration to produce the schema.rb file.
* Change the default generated fixtures to be less boring
* Modify the articles index action and view to query and display a list
  of articles
* Update the ArticlesControllerTest with new functionality

Completes Rails Getting Started Guide:
* 6 MVC and You
  * 6.1 Generating a Model
  * 6.2 Database Migrations
  * 6.3 Using a Model to Interact with the Database
  * 6.4 Showing a List of Articles

app/controllers/articles_controller.rb

@@ -1,4 +1,5 @@
 class ArticlesController < ApplicationController
   def index
+    @articles = Article.all
   end
 end

app/models/article.rb

@@ -0,0 +1,2 @@
+class Article < ApplicationRecord
+end

app/views/articles/index.html.erb

@@ -1 +1,9 @@
-<h1>Hello, Rails! Taxation is theft!</h1>
+<h1>Articles</h1>
+
+<ul>
+  <% @articles.each do |article| %>
+    <li>
+      <%= article.title %>
+    </li>
+  <% end %>
+</ul>

db/migrate/20211221193413_create_articles.rb

@@ -0,0 +1,10 @@
+class CreateArticles < ActiveRecord::Migration[7.0]
+  def change
+    create_table :articles do |t|
+      t.string :title
+      t.text :body
+
+      t.timestamps
+    end
+  end
+end

test/controllers/articles_controller_test.rb

@@ -4,6 +4,7 @@ class ArticlesControllerTest < ActionDispatch::IntegrationTest
   test "should get index" do
     get articles_url
     assert_response :success
-    assert_select 'h1', 'Hello, Rails! Taxation is theft!'
+    assert_select 'h1', 'Articles'
+    assert_select 'li', Article.count
   end
 end

test/fixtures/articles.yml

@@ -0,0 +1,22 @@
+# Read about fixtures at https://api.rubyonrails.org/classes/ActiveRecord/FixtureSet.html
+
+nerd:
+  title: Check out NerdDice
+  body: |
+    These videos take you end-to-end through a project that creates a ruby gem.
+    (The subject matter of polyhedral dice was chosen because Mike\'s a giant nerd.)
+    The series covers a number of programming concepts that will help you be a better
+    software developer, particularly in Ruby.
+
+why:
+  title: Why Stateless Code
+  body: |
+    Inspired by Simon Sinek\'s brilliant video Start with Why, these videos explain the
+    North Star of Stateless Code. What gets us out of bed in the morning and motivates
+    us to keep producing videos? Why do we do what we do? What is the dream for this
+    organization? Start at the center of the Golden Circle and communicate outward rather
+    than on the outside and communicating inward. Are we just being lazy video editors by
+    leaving the mistakes in our videos? Why the Jesus is Lord in the footer and the
+    in-your-face anarchy symbol in the branding? These videos are here to remind ourselves
+    of our promise to you. Taking the time to stop and think about the Why will help you
+    prioritize and avoid mission creep.

test/models/article_test.rb

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