Initial commit

db/migrate/20210319142051_create_authors.rb

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+class CreateAuthors < ActiveRecord::Migration[6.1]
+  def change
+    create_table :authors do |t|
+      t.string :first_name
+      t.string :last_name
+
+      t.timestamps
+    end
+
+    add_index :authors, [ :first_name, :last_name ]
+  end
+end

db/migrate/20210319142054_create_books.rb

@@ -0,0 +1,13 @@
+class CreateBooks < ActiveRecord::Migration[6.1]
+  def change
+    create_table :books do |t|
+      t.string :title
+      t.decimal :price, precision: 10, scale: 2
+      t.boolean :published
+
+      t.timestamps
+    end
+
+    add_index :books, :published
+  end
+end

db/migrate/20210319142059_create_authors_books.rb

@@ -0,0 +1,10 @@
+class CreateAuthorsBooks < ActiveRecord::Migration[6.1]
+  def change
+    create_table :authors_books do |t|
+      t.belongs_to :book
+      t.belongs_to :author
+
+      t.timestamps
+    end
+  end
+end

db/schema.rb

@@ -0,0 +1,41 @@
+# This file is auto-generated from the current state of the database. Instead
+# of editing this file, please use the migrations feature of Active Record to
+# incrementally modify your database, and then regenerate this schema definition.
+#
+# This file is the source Rails uses to define your schema when running `bin/rails
+# db:schema:load`. When creating a new database, `bin/rails db:schema:load` tends to
+# be faster and is potentially less error prone than running all of your
+# migrations from scratch. Old migrations may fail to apply correctly if those
+# migrations use external dependencies or application code.
+#
+# It's strongly recommended that you check this file into your version control system.
+
+ActiveRecord::Schema.define(version: 2021_03_19_142059) do
+
+  create_table "authors", force: :cascade do |t|
+    t.string "first_name"
+    t.string "last_name"
+    t.datetime "created_at", precision: 6, null: false
+    t.datetime "updated_at", precision: 6, null: false
+    t.index ["first_name", "last_name"], name: "index_authors_on_first_name_and_last_name"
+  end
+
+  create_table "authors_books", force: :cascade do |t|
+    t.integer "book_id"
+    t.integer "author_id"
+    t.datetime "created_at", precision: 6, null: false
+    t.datetime "updated_at", precision: 6, null: false
+    t.index ["author_id"], name: "index_authors_books_on_author_id"
+    t.index ["book_id"], name: "index_authors_books_on_book_id"
+  end
+
+  create_table "books", force: :cascade do |t|
+    t.string "title"
+    t.decimal "price", precision: 10, scale: 2
+    t.boolean "published"
+    t.datetime "created_at", precision: 6, null: false
+    t.datetime "updated_at", precision: 6, null: false
+    t.index ["published"], name: "index_books_on_published"
+  end
+
+end

db/seeds.rb

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+books = Book.create([
+  {
+    title: 'Journey to the Center of the Earth',
+    price: 10900,
+    published: true
+  },
+  {
+    title: 'From the Earth to the Moon',
+    price: 6300,
+    published: false
+  },
+  {
+    title: 'Imaginary trip',
+    price: 3600,
+    published: true
+  },
+])
+
+authors = Author.create([
+  {
+    first_name: 'Jules',
+    last_name: 'Verne'
+  },
+  {
+    first_name: 'Dick',
+    last_name: 'Pick',
+  },
+  {
+    first_name: 'Rick',
+    last_name: 'Pickle'
+  },
+])
+
+BookAuthor.create([
+  {
+    book: books.first,
+    author: authors.first
+  },
+  {
+    book: books[1],
+    author: authors.first
+  },
+  {
+    book: books[2],
+    author: authors[1]
+  },
+  {
+    book: books[2],
+    author: authors[2]
+  },
+])