In article <d393d2832e1f94df7d765538b9973fe4 / ruby-forum.com>,
 Mehdi Adda <mehdi.adda / gmail.com> wrote:

> I have told that if the value of the variable is changed via a sitter,
> it's possible to use a method chaining. How if there is no setter ?

What kind of variable? Global, local, instance? For the latter you could 
write your own attr_accessor method that either creates a call to a 
custom method or uses update() of Observer.

-- 
  Tobias Weber