bookstore/db/seeds.rb

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'
  },
])

books.first.authors << authors.first
books.second.authors << authors.first
books.third.authors << authors.second
books.third.authors << authors.third

User.create([
  {
    email: 'abc@o2.pl',
    password: 'aaaaaaaa',
    role: :admin
  },
  {
    email: 'abcd@o2.pl',
    password: 'aaaaaaaa',
    role: :customer
  },
  {
    email: 'abcde@o2.pl',
    password: 'aaaaaaaa',
    role: :customer
  },
])