JamonHash.rb

jamon_hash.rb

class JamonHash < HashWithIndifferentAccess
  def default(key = nil)
    if key.is_a?(String) && key.include?(".")
      find_value(key.split("."))
    else
      super
    end
  end

  def find_value(keys)
    key = keys.shift
    value = self[key]
    if keys.length > 0
      if value.is_a?(Hash)
        value[keys.join(".")]
      else
        nil
      end
    else
      value
    end
  end
end

usage.rb

hash = JamonHash.new
hash[:first] = JamonHash.new
hash[:first][:second] = "Hello!"

hash["first"]
# => {"second"=>"Hello!"} 

hash["first.second"]
# => "Hello!"

hash["first.second.third"]
# => nil