Add Post model

app/models/post.rb

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

db/migrate/20171031090614_create_posts.rb

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+class CreatePosts < ActiveRecord::Migration[5.1]
+  def change
+    create_table :posts do |t|
+      t.string :title
+      t.string :description
+      t.string :tag
+
+      t.timestamps
+    end
+  end
+end

db/migrate/20171031090759_add_user_id_to_post.rb

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+class AddUserIdToPost < ActiveRecord::Migration[5.1]
+  def change
+    add_reference :posts, :user, foreign_key: true
+  end
+end

test/fixtures/posts.yml

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+# Read about fixtures at http://api.rubyonrails.org/classes/ActiveRecord/FixtureSet.html
+
+one:
+  title: MyString
+  description: MyString
+  tag: MyString
+  user_id: 1
+
+two:
+  title: MyString
+  description: MyString
+  tag: MyString
+  user_id: 1

test/models/post_test.rb

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+require 'test_helper'
+
+class PostTest < ActiveSupport::TestCase
+  # test "the truth" do
+  #   assert true
+  # end
+end