Aloha,
I have a document which contains a model object created in the
document's -init method, and I have a ton of bindings hooked up to
this model by binding to the document nib's File's Owner and then
using the key path "myModel.whateverProperty". This works spectacularly.
To save the document, I simply archive this model object, and save the
resulting data. For reading document data, I simply unarchive the data
and I get back an instance of the model object. This works
spectacularly.
The tricky part is that I can't replace the existing model object that
was created in the document's -init method because all of the bindings
are hooked up to it. I thought I could simply get away with doing the
steps below, but I still get an error at runtime because the bindings
are still bound to the object that was released in the autorelease pool.
[self willChangeValueForKey:@"myModel"];
[myModel autorelease];
myModel = theUnarchivedModel;
[self didChangeValueForKey:@"myModel"];
So what should I do? After I unarchive the object I can certainly
assign every property from theUnarchivedModel instance to the existing
myModel instance, but that's tedious. Is there a correct and simple
way of doing this? The only options I see are assigning properties one
by one (ick), tearing down the bindings (major ick), or having some
kind of proxy object which entails having a whole bunch of glue code
(major ick).
Thanks,
--
Seth Willits
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