ruby - 在同一个类中调用私有方法将在 Ruby 1.9 上引发错误

Question

我在 中调用了一个私有方法initialize，并引发了一个无方法错误。如果我注释掉私有方法，它工作正常。我想我对使用私有方法有错误的概念，对吧？

in `initialize': private method `start' called for #<RemoteFocusAutomation::Autofocus:0x007fcfed00a3d8> (NoMethodError)

要点代码在这里https://gist.github.com/poc7667/7299274

Answer 1

self从self.start(args)您的Autofocus#initialize方法定义中删除。您不应该在 ruby​​ 中调用具有显式接收器的私有方法。它必须是隐式调用。

这是一个例子：

# I tried to call the private method with explicit receiver,which I supposed no to do,
# as Ruby wouldn't allow me,and will give me back error.
class Foo
    def initialize
        self.foo
    end
    private
    def foo;1;end
end

Foo.new
# `initialize': private method `foo' called for # (NoMethodError)

现在我正在做 Ruby 允许我做的事情：

class Foo
    def initialize
        foo
    end
    private
    def foo;p 1;end
end
Foo.new # => 1 # works!!