问Ruby:输出续集模型关联

EN

require 'sequel'
require 'json'

db = Sequel.connect('postgres://localhost/testing');

class Sequel::Model
  self.plugin :json_serializer
end

class Author < Sequel::Model(:author)
  one_to_many :book, key: :author_id, primary_key: :id

  def get_author
    Author.each do |e|
      books = Array.new
      e.book.each do |f|
        books.push(f.values)
      end
      e.values[:books] = books
      puts JSON.pretty_generate(e.values)
    end
  end
end

class Book < Sequel::Model(:book)
end

author = Author.new
author.get_author

[{
  "id": 1,
  "name": "Jack Johnson",
  "books": [{
    "id": 4,
    "name": "Songs with Chords",
    "genre": "Learning",
    "author_id": 1
  }]
}, {
  "id": 2,
  "name": "Mulder",
  "books": [{
    "id": 2,
    "name": "UFOs",
    "genre": "Mystery",
    "author_id": 2
  }, {
    "id": 3,
    "name": "Unexplained Paranorma",
    "genre": "Suspense",
    "author_id": 2
  }]
}, {
  "id": 3,
  "name": "Michael Crichton",
  "books": [{
    "id": 1,
    "name": "Jurassic Park",
    "genre": "Incredible",
    "author_id": 3
  }]
}]