ruby 是否有更简单的（一行）语法来为一个类方法设置别名？
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Is there simpler (one-line) syntax to alias one class method?
提问by AJcodez
I know I can do the following, and it's just 3 lines:
我知道我可以执行以下操作，而且只有 3 行：
class << self
alias :generate :new
end
But out of curiosity, is there a simpler way (without semicolons) like:
但出于好奇，是否有更简单的方法（没有分号），例如：
class_alias :generate, :new
回答by Konrad Reiche
Since Ruby 1.9 you can use the singleton_classmethod to access the singleton object of a class. This way you can also access the alias_methodmethod. The method itself is private so you need to invoke it with send. Here is your one liner:
从 Ruby 1.9 开始，您可以使用该singleton_class方法访问类的单例对象。这样您也可以访问该alias_method方法。该方法本身是私有的，因此您需要使用send. 这是你的一个班轮：
singleton_class.send(:alias_method, :generate, :new)
Keep in mind though, that aliaswill not work here.
但请记住，这alias在这里不起作用。
回答by Vijay Chouhan
I am pasting some alias method examples
我正在粘贴一些别名方法示例
class Test
def simple_method
puts "I am inside 'simple_method' method"
end
def parameter_instance_method(param1)
puts param1
end
def self.class_simple_method
puts "I am inside 'class_simple_method'"
end
def self.parameter_class_method(arg)
puts arg
end
alias_method :simple_method_new, :simple_method
alias_method :parameter_instance_method_new, :parameter_instance_method
singleton_class.send(:alias_method, :class_simple_method_new, :class_simple_method)
singleton_class.send(:alias_method, :parameter_class_method_new, :parameter_class_method)
end
Test.new.simple_method_new
Test.new.parameter_instance_method_new("I am parameter_instance_method")
Test.class_simple_method_new
Test.parameter_class_method_new(" I am parameter_class_method")
OUTPUT
输出
I am inside 'simple_method' method
I am parameter_instance_method
I am inside 'class_simple_method'
I am parameter_class_method
回答by Matt Sanders
I don't believe there is any class-specific version of alias. I usually use it as you have previously demonstrated.
我不相信alias. 我通常像您之前演示的那样使用它。
However you may want to investigate the differencebetween aliasand alias_method. This is one of those tricky areas of ruby that can be a bit counter-intuitive. In particular the behavior of aliaswith regard to descendants is probably not what you expect.
然而，你可能要探讨的差异之间alias和alias_method。这是 ruby 的棘手领域之一，可能有点违反直觉。特别是alias关于后代的行为可能不是您所期望的。
Hope this helps!
希望这可以帮助！
