#NEWLINE# def with_timestamps( self , created_at = None , updated_at = None ) : #NEWLINE# #INDENT# '\n        Specify that the pivot table has creation and update columns.\n        ' #NEWLINE# if ( not created_at ) : #NEWLINE# #INDENT# created_at = self . created_at ( ) #NEWLINE# #UNINDENT# if ( not updated_at ) : #NEWLINE# #INDENT# updated_at = self . updated_at ( ) #NEWLINE# #UNINDENT# return self . with_pivot ( created_at , updated_at )