1class Movie
 2  attr_accessor :id, :name, :studio, :reviews
 3
 4  def ==(other)
 5    return false unless other
 6    return false if other.id == -1
 7    return false if @id == -1
 8    @id == other.id
 9  end
10end
11
12class MovieMapping < Humble::DatabaseMapping
13  def run(map)
14    map.table :movies
15    map.type Movie
16    map.primary_key(:id, default: -1)
17    map.column :name
18    map.belongs_to :studio_id, Studio
19    map.has_many :reviews, Review
20  end
21end