gistfile1.rb

require "activerecord"
class ActiveRecord::Base
  class <<self
    def hidden_columns(*hidden)

      write_inheritable_array("hidden_column", hidden.collect(&:to_s))
    end

    def columns_hidden
      read_inheritable_attribute("hidden_column") || []
    end

    def columns

      unless defined?(@columns) && @columns
        @columns = connection.columns(table_name, "#{name} Columns").delete_if { |c| columns_hidden.member?(c.name) }
        @columns.each { |column| column.primary = column.name == primary_key }
      end
      @columns
    end

  end
end