ohm_order.rb

require 'ohm'

Ohm.redis = Redic.new("CONN_STRING")

class Photo < Ohm::Model
    reference :photo_album, "PhotoAlbum"
    attribute :name
    index :name
end

class PhotoAlbum < Ohm::Model
    collection :photos, "Photo"
    attribute :name
    index :name
end

def createPhotos(album, num)
  num.times do |n|
    p = Photo.create(name: "#{n}", photo_album: album)  
  end
end

def deletePhotos
  Photo.all.each { |p| p.delete }
  PhotoAlbum.all.each { |p| p.delete } 
end

smallAlbum = PhotoAlbum.create(name: "Small")
bigAlbum = PhotoAlbum.create(name: "Big")

createPhotos(smallAlbum, 100)
createPhotos(bigAlbum, 3000)  

puts "Small #{smallAlbum.photos.count}"
puts smallAlbum.photos.map { |p| p.name }.join(" ")

puts "Big #{bigAlbum.photos.count}"
puts bigAlbum.photos.map { |p| p.name }.join(" ")

deletePhotos