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

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