This test shows how you cannot search on an embedded document's hash

Mongoid Embed Hash Query

require "test/unit"
require "rubygems"
require "mongoid"

Mongoid.configure do |config|
  name = "embed_hash_test"
  host = "localhost"
  config.master = Mongo::Connection.new.db(name)
  config.persist_in_safe_mode = false
end


class RootDoc
  include Mongoid::Document
  
  field :data, :type => Hash
  
  embeds_many :embedded_docs
end


class EmbeddedDoc
  include Mongoid::Document
  
  field :data, :type => Hash
  embedded_in :root_doc, :inverse_of => :embedded_docs 
end

RootDoc.delete_all

class EmbeddedHashSearch <  Test::Unit::TestCase
  

  #passing test
  def test_root_doc_hash_search
    doc = RootDoc.create :data => {"test" => "searching on a root doc" }
    
    assert_equal RootDoc.where("data.test" => "searching on a root doc" ).first, doc
  end
  

  #failing test
  def test_embedded_hash_search
    root = RootDoc.new

    embed2 = EmbeddedDoc.new :data => {"test" => "should not find this one" }
    root.embedded_docs << embed2
    embed2.save

    embed = EmbeddedDoc.new :data => {"test" => "searching on embedded association" }
    root.embedded_docs << embed
    embed.save

    assert_equal root.embedded_docs.where("data.test" => "searching on embedded association" ).to_a, [embed]
  end

end