module SmartCsv
  module Exportable

    module ClassMethods
      def self.to_csv(*args)
        find(:all).to_csv(*args)
      end
    end

    module InstanceMethods
      def export_columns(format = nil)
        self.class.content_columns.map(&:name) - ['created_at', 'updated_at']
      end

      def to_row(format = nil)
        export_columns(format).map { |c| self.send(c) }
      end      
    end
  
    def self.included(receiver)
      receiver.extend ClassMethods
      receiver.send :include, InstanceMethods      
    end
    
  end
end

ActiveRecord::Base.send :include, SmartCsv::Exportable