reflection.rb

module InitFromHash
  
  def initialize(*args)
    args.first.each do |k, v|       
      unless defined?(k).nil?         
        result = v.instance_of?(Array) ? v.inject([]) {|arr, v1| arr << init_object(v1, k)} : init_object(v, k)
        instance_variable_set("@#{k}", result)
      end
    end if (args.length == 1 && args.first.is_a?(Hash)) 
  end
  
  def init_object(value, klass)    
    value.instance_of?(Hash) ? constantize(get_module_name + klass.to_s.capitalize).new(value) : value
  end
  
  def get_module_name
    (self.class.name =~ /^(.+::).+$/) ? $1 : ''
  end
  
  def constantize(camel_cased_word)
    names = camel_cased_word.split('::')
    names.shift if names.empty? || names.first.empty?
  
    constant = Object
    names.each do |name|
      constant = constant.const_defined?(name) ? constant.const_get(name) : constant.const_missing(name)
    end
    constant
  end
    
end