I'm subclassing NSArray to abstract it against a remote data source,
specifically a MySQL table. The only issue I have is that instead of
evaluating predicates locally on the machine, I want to evaluate the
predicate remotely through MySQL. I have pretty decent predicate->SQL
statement support going right now, and I can correctly execute a SQL
statement and return row objects.
My only issue is with NSArrayController's predicate. Does
NSArrayController attempt to evaluate the predicate internally by
pulling rows from the NSArray one by one? Or does it defer to
NSArray's filteredArrayUsingPredicate:? If the NSArrayController
attempts to evaluate the predicate internally, this could be a
problem for me because it's going to pull every row from the server
and evaluate it locally. If it defers to NSArray's
filteredArrayUsingPredicate:, it will hit my subclassed
filterArrayUsingPredicate:, which will evaluate the predicate as a
SQL statement on the server, not pegging the server.
I'm trying to put together a test program, but am having some issues
getting the predicate that is bound to the NSArrayController to even
work with my NSArray subclass (so far it doesn't seem to be filtering
at all), so I thought I'd ask the list for input.
Thanks, Colin
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