November 2012
Intermediate to advanced
888 pages
54h 46m
Polish
Content preview from Ruby. Receptury
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10.8. Reagowanie na wywołania niezdefiniowanych metod
Problem
Zamiast doświadczać wyjątku NoMethodError jako standardowej reakcji na wywołanie niezdefiniowanej metody, chcielibyśmy sytuację tę obsłużyć we własnym zakresie.
Albo: definiujemy klasę, dla której nie da się określić a priori zestawu metod, które wywoływane będą na rzecz jej obiektów lub jej samej. Chcielibyśmy w związku z tym zdefiniować pojedynczą metodę, do której kierowane będą wszystkie wywołania jakichkolwiek metod.
Rozwiązanie
Gdy w klasie zdefiniowana zostanie metoda o nazwie method_missing, jej wywołanie staje się alternatywą dla generowania wyjątku NoMethodError. Parametrem jej wywołania jest nazwa niezdefiniowanej metody oraz zestaw argumentów, z jakimi metoda ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.