1:1 and 1:many to same class

gistfile1.rb

class Game
  include Mongoid::Document
  field :title
  
  referenced_in :dungeon_master, :class_name => 'User'
  references_and_referenced_in :players, :class_name => 'User'
end

class User
  include Mongoid::Document
  field :name
  
  references_one :game, :inverse_of => :dungeon_master
end

master = User.new("John C. Awesome")
player = User.new("Fred Player")

Game.new(:title => "Lonely Game", :dungeon_master => master)
# no problem

Game.new(:title => "Fun Game", :dungeon_master => master, :players => [player])
# You have a nil object when you didn't expect it!
# You might have expected an instance of Array.
# The error occurred while evaluating nil.push
# /Users/kasima/.rvm/gems/ruby-1.9.2-p136@topaz/gems/mongoid-2.0.0.rc.6/lib/mongoid/relations/bindings/referenced/many_to_many.rb:49:in `bind_one'