define_read_method

# File activerecord/lib/active_record/base.rb, line 1911
      def define_read_method(symbol, attr_name, column)
        cast_code = column.type_cast_code('v') if column
        access_code = cast_code ? "(v=@attributes['#{attr_name}']) && #{cast_code}" : "@attributes['#{attr_name}']"
        
        unless attr_name.to_s == self.class.primary_key.to_s
          access_code = access_code.insert(0, "raise NoMethodError, 'missing attribute: #{attr_name}', caller unless @attributes.has_key?('#{attr_name}'); ")
          self.class.read_methods << attr_name
        end
        
        evaluate_read_method attr_name, "def #{symbol}; #{access_code}; end"
      end