# rails methods

# returns column_names arrays
Model.column_names

# returns attr_keys arrays
object.attributes.keys

# returns attr_keys values
object.attributes.values

# set custom table name
class Model < ActiveRecord::Base
  self.table_name = "mdels"
end

# module  for has_one
module Addressable
  def self.included(klazz)  # klazz is that class object that included this module
    klazz.class_eval do
      has_one :address
    end
  end
end