nspredicate

How would I filter (construct an NSPredicate) for the following. Have a SCHOOL and PERSON entities One-to-many relationship, i.e. a PERSON has one SCHOOL, SCHOOL has many PERSONs Input to the filter method are (a) persons Name (e.g. all with a first name of "Tom") , and (b) the managed object of the School itself. for the purposes of this question assume School has no unique attributes So then my confusion/observations are: I already have the School managed object itself, however not sure how to use this when creating the predicate? But if I create the NSPredicate how do I create the

I have a predicate editor, which the template was generate via the following: NSArray * test = [NSArray arrayWithObjects: [NSExpression expressionForKeyPath: @"Abc"], [NSExpression expressionForKeyPath: @"Def"], nil]; NSPredicateEditorRowTemplate * template = [[NSPredicateEditorRowTemplate alloc] initWithLeftExpressions: test rightExpressionAttributeType: NSStringAttributeType modifier: NSDirectPredicateModifier operators: [NSArray arrayWithObject: [NSNumber numberWithUnsignedInteger:NSContainsPredicateOperatorType]] options:(NSCaseInsensitivePredicateOption

I have a question about using fetched properties inside a NSPredicate (see below 'My question'). It's not about the predicate to get the fetched property. For clarification and for others, which may also face this problem I tried to make a small sample project. SAMPLE PROJECT The need to use Fetched Properties came, because my app was rejected because of violating the iOS Data Storage Guidelines. In QA1719 they write: Apps should avoid mingling app data and user data in the same file. I think this may be necessary for easier ICloud sync and may also help in migration. So, how to do this? I had

With NSArray only i can find values as: NSArray *arr = [NSArray arrayWithObjects:@"299-1-1", @"299-2-1", @"299-3-1", @"399-1-1", @"399-2-1", @"399-3-1", @"499-1-1", @"499-2-1", @"499-3-1", nil]; NSString *search = @"299"; NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF CONTAINS %@",[NSString stringWithFormat:@"%@", search]]; NSArray *array = [arr filteredArrayUsingPredicate: predicate]; NSLog(@"result: %@", array); Found Result as expected : result: ( "299-1-1", "299-2-1", "299-3-1" ) But for NSArray having NSArray with NSString NSArray *arr = [NSArray arrayWithObjects:

I'mm working around with Core Data and NSFetchedResultsController . My Data Model looks like this: Product with one-to-many relationship called dataLines . The dataLine entity has a property name theWeek . I want to fetch all Product where dataLines.theWeek == someValue . This is easily done with a subquery. But this returns all dataLines. Is it possible to create a NSPredicate that returns the Product and a subset if dataLines only with the dataLines == someValue ? What you want to achieve could be reached in two ways: using a SUBQUERY [NSPredicate predicateWithFormat:@"SUBQUERY(dataLines, $x

I'm attempting to use an IN clause with an NSPredicate. I'm getting the following error: *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSTaggedPointerString countByEnumeratingWithState:objects:count:]: unrecognized selector sent to instance 0xa000000000000611' Here's the code: let fetchRequest: NSFetchRequest<Employee> = NSFetchRequest(entityName: "Employee") fetchRequest.sortDescriptors = [ NSSortDescriptor.init(key: "lastName", ascending: true) ] fetchRequest.predicate = NSPredicate(format: "ANY id IN %@", argumentArray: recentEmployeeIds)

I have the data model you can see below, and a nested SUBQUERY predicate, but in somehow it just not works. Any idea how to correct it? I figured out, this here down is working finally: [NSPredicate predicateWithFormat:@"SUBQUERY(bs, $B, SUBQUERY($B.cs, $C, $C.ds.name != \"xxx\").@count > 0).@count > 0"]; Ok, so here is the working solution: [NSPredicate predicateWithFormat:@"SUBQUERY(bs, $B, SUBQUERY($B.cs, $C, $C.ds.name != \"xxx\").@count > 0).@count > 0"]; 来源： https://stackoverflow.com/questions/13242383/what-is-wrong-in-my-nested-subquery-predicate