ruby
require 'spec_helper'

class Display
  include Mongoid::Document
  embeds_many :tables do
    def flipped
      where(flipped: true).first
    end
  end
end

class Table
  include Mongoid::Document
  embedded_in :display
end

describe Mongoid do

  let(:cache) do
    ActiveSupport::Cache::MemoryStore.new
  end

  it "returns flipped tables" do
    display = Display.create!
    flipped_table = Table.new(flipped: true)
    display.tables << flipped_table
    display.tables.flipped.should == flipped_table

    2.times do
      display = cache.fetch "display" do
        display
      end
    end

    display.tables.flipped.should == flipped_table
  end

end

  1) Mongoid caches and retrieves
     Failure/Error: display.tables.flipped.should == flipped_table
     NoMethodError:
       undefined method `flipped' for [#<Table _id: 511c130b3b5552e85c000002, flipped: true>]:Array
     # ./lib/mongoid/criteria.rb:510:in `method_missing'
     # ./lib/mongoid/relations/embedded/many.rb:404:in `block in method_missing'
     # ./lib/mongoid/scoping.rb:190:in `with_scope'
     # ./lib/mongoid/relations/embedded/many.rb:403:in `method_missing'
     # ./spec/dblock/new_spec.rb:35:in `block (2 levels) in <top (required)>'