From: Richard Leber <rleber@...>
Date: 2010-04-13T02:08:35+09:00
Subject: Nuances of alias_method

I am stumbling around some of the nuances of Ruby classes, especially in
regard to alias_method. Specifically, can someone explain to me why this
doesn't work:

  class A
    def A.foo
      "Hello"
    end
  end

  A.send(:alias_method, :bar, :foo) # => NameError: undefined method
`foo' for class `A'

But this does:

  class A
    def A.foo
      "Hello"
    end
  end

  class << A
    alias_method :bar, :foo
  end

  A.foo # => Hello
  A.bar # => Hello
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