How to add statements to an existing method definition in Ruby

Question

I noticed for the class definition, if I open up the class MyClass, and add something in between without overwrite I still got the original method which defined earlier. The new statements added augment the existing one.

But as to the method definition, I still want the same behavior as the class definition, but it seems when I open up the def my_method, the exiting statements within the def and end is overwritten, I need to rewrite that again.

So is there any way to make the method definition behave the same as definition, something like super, but not necessarily is the sub-class?

This is largely a duplicate of When monkey patching a method, can you call the overridden method from the new implementation. — Jörg W Mittag
– Jörg W Mittag, Commented Aug 6, 2011 at 14:40

emboss · Accepted Answer · 2011-08-06 12:21:46Z

10

I suppose you are looking for alias_method:

class A
  alias_method :old_func, :func

  def func
    old_func # similar to calling 'super'
    # do other stuff
  end
end

answered Aug 6, 2011 at 12:21

emboss

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