How to get the name of the calling alias method in a Module?

Asked Jun 16 '17 at 07:27

Active Jun 16 '17 at 09:09

Viewed 36 times

I have a Ruby method which is aliased to several alternative names, and within the method, I would like to know which alias has called me.

This posting suggests that I could use __callee__ to get at this information. However, this does not work in my case, since I am in a module and the method is a module method. The following example demonstrates the problem:

module Demo
  extend self
  def f
    puts __callee__
  end
  alias g f
  alias_method :h,:f
end

Demo.f
Demo.g
Demo.h

This outputs

f
f
f

and not

f
g
h

Could someone explain, why it doesn't work, and how I can do it correctly?

UPDATE: From the feedback I got here and also from other developers, this seems to be a bug in Ruby, which was fixed in 2.3.4.

edited Jun 16 '17 at 09:09

asked Jun 16 '17 at 07:27

user1934428

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1

Works for me (ruby 2.3.4) – Sergio Tulentsev Jun 16 '17 at 07:30
I tried it with MRI Ruby 2.3.3 for Cygwin, and with JRuby 1.7.26 (language compatible to 1.9.3), and both did not work. There must be something really odd going on; I would be surprised, if this were a long-standing bug, which just got corrected in 2.3.4. You really used copy and paste of my code to run it on your platform? – user1934428 Jun 16 '17 at 07:34
yep, [I copy/pasted](https://pastebin.com/MyM4tgFQ). Try 2.3.4 and see if it works. I'm on macos, btw. – Sergio Tulentsev Jun 16 '17 at 07:35
1

Indeed, tried in 2.3.3 and I get `f f f`. So yes, it appears to be fixed in 2.3.4 – Sergio Tulentsev Jun 16 '17 at 07:38
2

https://bugs.ruby-lang.org/issues/11964 – Stefan Jun 16 '17 at 09:10

How to get the name of the calling alias method in a Module?

0 Answers0