Interview test task

base.rb

class Base
  def initialize(attrs={})
    # implement this
  end

  def self.find(id)
    # implements this
  end
  
  def self.db
    Database.new
  end
  
  def save
    # implement this
  end
  
  # implement attribute getters
  # implement attribute setters
end

book.rb

class Book < Base
end

database.rb

class Database
  def select(id)
    # returns hash or nil
  end
  
  def insert(attrs)
    # inserts data into DB, returns id
  end
  
  def update(id, attrs)
    # updates record with given id
  end
end

example.rb

book = Book.new(title: 'Lord of the Rings', pages: 500)
book.save

book = Book.find(10)
puts book.title
book.title = 'Another title'
book.save