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POHow to use a predicate on NSTimeInterval?
 

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  1. POHow to use a predicate on NSTimeInterval?
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    <p>I would like to get all records for the current month, so I stack two predicates for first date of the month and last day of the month. Since I use CoreData the dates are stored actually as NSTimeInterval.</p> <pre><code>NSCalendar *calendar = [NSCalendar currentCalendar]; //Get beginning of current month NSDateComponents *beginningOfCurrentMonthComponents = [calendar components:(NSEraCalendarUnit | NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit) fromDate:date]; [beginningOfCurrentMonthComponents setDay:1]; NSDate *beginningOfCurrentMonthDate = [calendar dateFromComponents:beginningOfCurrentMonthComponents]; //Set a single month to be added to the current month NSDateComponents *oneMonth = [[NSDateComponents alloc] init]; [oneMonth setMonth:1]; //determine the last day of this month NSDate *beginningOfNextMonthDate = [calendar dateByAddingComponents:oneMonth toDate:beginningOfCurrentMonthDate options:0]; NSMutableArray *parr = [NSMutableArray array]; [parr addObject:[NSPredicate predicateWithFormat:@"recordDate &gt;= %d", [beginningOfCurrentMonthDate timeIntervalSince1970]]]; [parr addObject:[NSPredicate predicateWithFormat:@"recordDate &lt; %d", [beginningOfNextMonthDate timeIntervalSince1970]]]; //Give me everything from beginning of this month until end of this month NSPredicate *predicate = [NSCompoundPredicate andPredicateWithSubpredicates:parr]; return [allRecords filteredArrayUsingPredicate:predicate]; </code></pre> <p>Upon returning the filtered array, it crashes with this error message:</p> <pre><code>2013-10-25 19:09:39.702 [3556:a0b] -[__NSCFNumber timeIntervalSinceReferenceDate]: unrecognized selector sent to instance 0x8911440 2013-10-25 19:09:39.704 [3556:a0b] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFNumber timeIntervalSinceReferenceDate]: unrecognized selector sent to instance 0x8911440' *** First throw call stack: ( 0 CoreFoundation 0x01aa85e4 __exceptionPreprocess + 180 1 libobjc.A.dylib 0x0182b8b6 objc_exception_throw + 44 2 CoreFoundation 0x01b45903 -[NSObject(NSObject) doesNotRecognizeSelector:] + 275 3 CoreFoundation 0x01a9890b ___forwarding___ + 1019 4 CoreFoundation 0x01a984ee _CF_forwarding_prep_0 + 14 5 CoreFoundation 0x01a7e3e3 -[NSDate compare:] + 67 6 Foundation 0x014194fe -[NSComparisonPredicateOperator performPrimitiveOperationUsingObject:andObject:] + 408 7 Foundation 0x014b03de -[NSPredicateOperator performOperationUsingObject:andObject:] + 306 8 Foundation 0x014b016c -[NSComparisonPredicate evaluateWithObject:substitutionVariables:] + 347 9 Foundation 0x014299b6 -[NSCompoundPredicateOperator evaluatePredicates:withObject:substitutionVariables:] + 240 10 Foundation 0x01429845 -[NSCompoundPredicate evaluateWithObject:substitutionVariables:] + 294 11 Foundation 0x014b0009 -[NSPredicate evaluateWithObject:] + 48 12 Foundation 0x014aff89 _filterObjectsUsingPredicate + 418 13 Foundation 0x014afd42 -[NSArray(NSPredicateSupport) filteredArrayUsingPredicate:] + 328 </code></pre> <p>I used this loop also to indicate that the recordDate truly exists within the array:</p> <pre><code>for (FTRecord *r in allRecords) { NSLog(@"%f", [r recordDate]); } 2013-10-25 19:09:35.860 [3556:a0b] 1380582000.000000 2013-10-25 19:09:36.556 [3556:a0b] 1380754800.000000 </code></pre>
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      1. POHow to use a predicate on NSTimeInterval?
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    1. COThe stack trace shows that an `NSDate` object is involved in the predicate. Try changing your `NSPredicate` to compare `recordDate` against an `NSDate` instead of the time interval.
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      1. POHow to use a predicate on NSTimeInterval?
      1. USrmaddy
    2. COI just double checked everything. But you see that both dates are converted into NSTimeInterval though. I even did what you suggested, by deleting `timeIntervalSince1970` and it still crashes with the same message. BTW, I have now added how the dates were created, maybe it helps to track down the problem.
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