#NEWLINE# def and_( self , option ) : #NEWLINE# #INDENT# '\n        Chain another RelationshipCache option to this one.\n\n        While many RelationshipCache objects can be specified on a single\n        Query separately, chaining them together allows for a more efficient\n        lookup during load.\n        ' #NEWLINE# self . _relationship_options . update ( option . _relationship_options ) #NEWLINE# return self