On Sep 3, 2009, at 12:14, Alexander Cohen wrote:
Ah, ok, this is more like what i wanted to hear! :) I understand how
@dynamic works, but how to I get to funnel all calls to @dynamic
properties to the same call such as setValue:forKey: or something
like that where i can parse the key and update my internal data and
set the flags i need to set.
No, you're barking up the wrong tree.
There's no "how @dynamic works". @dynamic is a compiler directive
telling it that getter/setter method implementations exist, but just
not in the current compilation unit. There no standard general
mechanism for supplying the implementation.
In the case of Core Data specifically, the built-in implementations
(call them "dynamic" if you want, but that's the same as their being
compiled as "@dynamic") are simply efficient versions of what you
would otherwise have to hand-code. We don't know if they're funneled
through one funnel, several funnels, or a different function for every
property -- that's an implementation detail.
(IAC, Core Data doesn't mark objects as changed in *those* dynamic
methods, but (presumably -- another implementation detail) in the
primitive<Key> dynamic methods.)
I don't how you're ever going to be able to have a class detect
invocations of its subclasses' properties, unless you have the class
muck around in the runtime, replacing methods on the fly.
A better solution, IMO, is to realize that you're considering a design
requirement for your data model, and to design the solution right into
the model. For example, if this is a self-contained class hierarchy
that you're implementing, you could make it a requirement of
subclasses that they invoke something (a superclass method) or inform
something (a controller of some kind) when they modify data values.
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