Changing aliased method does not alter the original one

Changing aliased method does not alter the original one, and vice-versa.

So, if you need to alter some method that you know it's aliased, you may stay unworried: you won't affect the other aliased methods, and you can use them if you need the original behavior.

See my tests and the results below.

#!/usr/bin/ruby

class A
  def original_method
    puts "original content"
  end
  alias aliased_method original_method
  alias_method :alias_methoded_method, :original_method
end

class B < A
  def original_method
    puts "modified content"
  end
end

class C < A
  def aliased_method
    puts "modified content"
  end
end

class D < A
  def alias_methoded_method
    puts "modified content"
  end
end

[A, B, C, D].each do |klass|
  puts "#{klass}:"
  obj = klass.new
  [:original_method, :aliased_method, :alias_methoded_method].each do |meth|
    print "#{meth}: "
    obj.send meth
  end
  puts
end

The results:

A:
original_method: original content
aliased_method: original content
alias_methoded_method: original content

B:
original_method: modified content
aliased_method: original content
alias_methoded_method: original content

C:
original_method: original content
aliased_method: modified content
alias_methoded_method: original content

D:
original_method: original content
aliased_method: original content
alias_methoded_method: modified content