iphone - Checking for existing value in NSFetchedResultsController / Core Data -


i have code calls api , gets set of results back, let's call them 'message' objects. each message has unique id.

unfortunately, cannot guarantee server not give me message have not received , stored in core data database.

the unique id set nsnumber field in 'message' entity.

is there way 'on-the-fly' check database see if 'message' exists given unique id?

currently i'm creating instance of helper object each time need check, , creating nsfetchedresultscontroller returning filtered results via nspredicate. if results returned, move on, or store in database. suspect slow approach...

any help?

looks need:

nsuinteger count = [self.managedobjectcontext countforfetchrequest:fetchrequest error:&error];

this gives me count without doing query - better.


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