ruby
require 'spec_helper'

class Boy
  include Mongoid::Document

  has_and_belongs_to_many :girls, inverse_of: nil
end

class Girl
  include Mongoid::Document

  field :saves, type: Integer, default: 0
  before_save :increment_saves

  def increment_saves
    self.saves += 1
  end
end

describe "relationship" do
  it "doesn't callback on target when inverse_of nil" do
    boy = Boy.create!
    girl = Girl.create!
    girl.saves.should == 1
    boy.girls << girl
    girl.saves.should == 1 # fails, now 2
  end
end