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liamnichols/gist:7942200

Created December 13, 2013 09:58
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gistfile1.m
NSFetchRequest *search = [NSFetchRequest fetchRequestWithEntityName:@"<<ENTITY NAME>>"];
search.resultType = NSDictionaryResultType;
search.returnsDistinctResults = YES;
search.propertiesToFetch = @[ @"<<ID KEY>>" ];
NSArray *results = [managedObjectContext executeFetchRequest:search error:nil];
NSSet *allIDs = [NSSet setWithArray:[results valueForKeyPath:@"<<ID KEY>>"]];
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