Hello,

I am writing a web app and I need to version the attributes of my
objects so that I can enable undo capabilities.

Is there a best practices way to offer such?

Currently I am implementing accessors which simply create an
OrderedCollection for each attribute.


id: anObject
    id ifNil: [
        id := OrderedCollection new.
        id add: anObject].
    (id = anObject) ifFalse: [id add: anObject]

 
obj id
    ^ id last


Is there a more standard or better way to offer such features?

Any wisdom greatly appreciated.

Jimmie