migration and associations

completes #26

db/migrate/20160915164450_create_reviewer_to_quizzes.rb

@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+class CreateReviewerToQuizzes < ActiveRecord::Migration[5.0]
+  def change
+    create_table :reviewer_to_quizzes do |t|
+      t.integer :user_id, null: false
+      t.integer :quiz_id, null: false
+
+      t.timestamps
+    end
+    add_index :reviewer_to_quizzes, :quiz_id
+  end
+end