Working Mongoid/Sunspot search including without() against a relation

search_spec.rb

require 'spec_helper'

class MyObject
  include Mongoid::Document
  include Mongoid::Timestamps
  include Mongoid::Paranoia
  include Sunspot::Rails::Searchable
  field :title, type: String
  validates_presence_of :title
  attr_accessible :title
  has_and_belongs_to_many :rooms, index: true


  searchable do
    text :title
    string  :room_ids, :multiple => true
  end

end

class Room
  include Mongoid::Document
  include Mongoid::Timestamps
  include Mongoid::Paranoia
  include Sunspot::Rails::Searchable
  has_and_belongs_to_many :products, index: true
end




describe MyObject do

  it "should be able filter by without() against an empty array", :solr => true do
    title = 'Cool Thing'
    obj = MyObject.create!(title: title)
    room = Room.create!
    obj.index!

    search = MyObject.solr_search do
      without(:room_ids, [room.id])
      fulltext title
    end

    search.results.count.should == 1

    search = MyObject.solr_search do
      without(:room_ids, room.id)
      fulltext title
    end

    search.results.count.should == 1

    obj.rooms << room
    obj.save!
    obj.index!
    
    search = MyObject.solr_search do
      without(:room_ids, room.id)
      fulltext title
    end

    search.results.count.should == 0

  end
end