gistfile1.rb

orm.map(Exhibit, "exhibits") do |exhibits, type|
  exhibits.field :id, type.serial
  exhibits.field :name, type.string(200)
  exhibits.field :zoo_id, type.integer

  exhibits.key :id
end

orm.map(ZooKeeper, 'zoo_keepers') do |zoo_keepers, type|
  zoo_keepers.field :id, type.serial
  zoo_keepers.field :name, type.string(200)

  zoo_keepers.key :id

  zoo_keepers.many_to_many(:exhibits, Exhibit, 'exhibits_zoo_keepers')
end

# this is what i thought for ManyToMany#load but there's no relation between Exhibits -> ZooKeeper
# only Exhibits <- ZooKeeper
orm.all(Exhibits) do |exhibits|
  exhibits.zoo_keepers.id.eq(1)
end