ssh2 client

ssh2 client 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. 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.

ssh2 client 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. This is described under Object#method_missing on page 355.] So, back to our example.

ssh2 client 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. That's why it prints out the song details but not the lyrics---class Song doesn't know anything about lyrics. Let's fix this by implementing KaraokeSong#to_s.

ssh2 client

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ssh2 client