how to pass info to a Rails Observer class?

[Kairi Zikpin]

Hi all,

I'd like to know how do I go about passing information to an Observer
class in Rails?

I've not been able to find an example for this on line. All I've seen is
that the model object is passed in automatically. I'd like to be able to
pass in other information as well.

And if it can't be done with Observers, can it be done with Callback
classes?

thx.
rails newbie here so bare with me...