Simplified example of failing any_in criteria for mongoid using string id fields

failure_message.txt

Failures:

  1) Mongoid inclusion criteria 
     Failure/Error: @criteria.selector.should == {"$in" => {:from_id => [from_port.id, to_port.id]}}
     expected: {"$in"=>{:from_id=>["6055df90-0572-012f-2043-388d1201202c", "60562bc0-0572-012f-2043-388d1201202c"]}},
          got: {:from_id=>"{\"$in\"=>[\"6055df90-0572-012f-2043-388d1201202c\", \"60562bc0-0572-012f-2043-388d1201202c\"]}"} (using ==)
     Diff:
     @@ -1,5 +1,3 @@
     -{"$in"=>
     -  {:from_id=>
     -    ["6055df90-0572-012f-2043-388d1201202c",
     -     "60562bc0-0572-012f-2043-388d1201202c"]}}
     +{:from_id=>
     +  "{\"$in\"=>[\"6055df90-0572-012f-2043-388d1201202c\", \"60562bc0-0572-012f-2043-388d1201202c\"]}"}
     # ./spec/mongoid_inclusion_spec.rb:34:in `block (2 levels) in <top (required)>'

mongoid_inclusion_spec.rb

require 'rspec'
require 'mongoid'
require 'uuid'

Mongoid.configure do |config|
  config.master = Mongo::Connection.new.db("godfather")
end


class GUIDObject
  include Mongoid::Document

  field :guid
  key :guid
end

class Connection < GUIDObject
  referenced_in :from, :class_name => "Port", :inverse_of => nil
  referenced_in :to, :class_name => "Port", :inverse_of => nil
end  

class Port < GUIDObject
end

describe "Mongoid inclusion criteria" do
  let(:from_port) { Port.create(:guid => UUID.generate) }
  let(:to_port) { Port.create(:guid => UUID.generate) }
  let(:connection) { Connection.create(:guid => UUID.generate, :from => from_port, :to => to_port) }
  before do
    @criteria = Connection.any_in(:from_id => [from_port.id, to_port.id])
  end
  
  it do
    @criteria.selector.should == {"$in" => {:from_id => [from_port.id, to_port.id]}}
  end
end