Before I go reinventing the wheel to try to code around this...
Is there any way I can set up a "live" NSFetchRequest in a Core Data
model, so that is matches against the predicate change (for example,
predicate filters on a field, the value of that field changes such that
an object suddenly matches that did not before, or no longer matches
when it previously did), I can get some sort of notification of the
change - or even that there /was/ a change?
Notes:
* The predicate is being created by the user using an NSPredicateEditor
and I am allowing a large selection of fields.
* The data set could grow to include several thousand objects (maybe
tens/hundreds of thousands in some cases)
* I am using the result set in "real time" in some cases and need to
know almost immediately when a change takes place - not a good thing to
be rerunning the query multiple times per second if I don't know that a
change happened - and changes to some of the attributes could be
happening multiple times per second in some cases.
* Some of the attributes are calculated from other attributes, but I am
updating them in such a way that bindings fire.
* MacOS X, not iDevices
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