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low cost private jsp mysql ") aSong.to_s » "Song: My Way--Sinatra (225)" Well, it ran, but why doesn't the to_s method show the lyric? The answer has to do with the way Ruby determines which method should be called when you send a message to an object. When Ruby compiles the method invocation aSong.to_s, it doesn't actually know where to find the method to_s. Instead, it defers the decision until the program is run.
low cost private jsp mysql At that time, it looks at the class of aSong. If that class implements a method with the same name as the message, that method is run. Otherwise, Ruby looks for a method in the parent class, and then in the grandparent, and so on up the ancestor chain. If it runs out of ancestors without finding the appropriate method, it takes a special action that normally results in an error being raised.[In fact, you can intercept this error, which allows you to fake out methods at runtime.
low cost private jsp mysql This is described under Object#method_missing on page 355.] So, back to our example. We sent the message to_s to aSong, an object of class KaraokeSong. Ruby looks in KaraokeSong for a method called to_s, but doesn't find it. The interpreter then looks in KaraokeSong's parent, classSong, and there it finds the to_s method that we defined on page 18.
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