From: Kevin Smith <sent@...>
Date: 2001-01-03T14:47:56+09:00
Subject: [ruby-talk:8557] Observing multiple observables

Someone else wrote about this a week or so ago, 
and I responded. Basically, the Ruby observer mix-
in assumes that you are only going to be 
observing a single observable. Within that 
restriction, it's great.

But I just ran into a case where I wanted to 
observe two things at the same time. I solved it 
by creating a little observable proxy class, but 
I think the library could be tweaked to provide 
the same  functionality while retaining backward 
compatibility.

The definition of add_observer would change to:

def add_observer(object, methodSymbol = :update)

When it comes time to actually do the update, it 
calls:

object.method(methodSymbol).call(*args)

If the client calls add_observer(obj) it behaves 
as it always has. But it allows the client to 
attach different methods to each observable that 
it is watching.

What would it take to get a change like this into 
the library? I'm willing to do some or all of it, 
but I need to know the process.

Kevin