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Documents, Archived Objects, and Bindings
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Documents, Archived Objects, and Bindings


  • Subject: Documents, Archived Objects, and Bindings
  • From: Seth Willits <email@hidden>
  • Date: Tue, 15 Apr 2008 00:27:52 -0700

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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  • Follow-Ups:
    • Re: Documents, Archived Objects, and Bindings [Nevermind...]
      • From: Seth Willits <email@hidden>
    • Re: Documents, Archived Objects, and Bindings
      • From: mmalc crawford <email@hidden>
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