#NEWLINE# def _prepare_for_put( self , entity ) : #NEWLINE# #INDENT# 'A method to augment the current value if not already set.\n\n        Args:\n            entity: The entity possessing this property.\n        ' #NEWLINE# if ( not self . _has_value ( entity ) ) : #NEWLINE# #INDENT# user = users . get_current_user ( ) #NEWLINE# unique_id = Contributor . unique_id ( user . email ( ) ) #NEWLINE# now_as_string = datetime . datetime . now ( ) . strftime ( TIME_FORMAT ) #NEWLINE# value = '{}|{}' . format ( now_as_string , unique_id ) #NEWLINE# self . _store_value ( entity , value )