nsfetchrequest

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 have a saveMOC which is the direct parent of a mainMOC , and I need for online fetch another tmpMOC in order not to block my UI whilst fetching a ton of records from the Internet. My app freezes. I could narrow it to this very point: fetchedItems = [tmpMOC executeFetchRequest:fetchRequest error:&error]; I tried to enclose this within dispatch_sync , [moc.parentcontext.parentcontext.persistentStoreCoordinator lock/unlock] , [whatevermoc performBlockAndWait] ... I also try to fetch the _mainMOC ... No way... I understand that executeFetchRequest is not thread safe, so, how do I lock whatever I

I'm building an app using Swift with Core Data. At one point in my app, I want to have a UITableView show all the objects of a type currently in the Persistent Store. Currently, I'm retrieving them and showing them in the table view using an NSFetchedResultsController . I want the table view to be sorted by a computed property of my NSManagedObject subclass, which looks like this: class MHClub: NSManagedObject{ @NSManaged var name: String @NSManaged var shots: NSSet var averageDistance: Int{ get{ if shots.count > 0{ var total = 0 for shot in shots{ total += (shot as! MHShot).distance

how I can call es request with distinct values in swift? This is my code: let appDelegate: AppDelegate = UIApplication.sharedApplication().delegate as AppDelegate let context: NSManagedObjectContext = appDelegate.managedObjectContext let request = NSFetchRequest(entityName: "MedicalData") request.propertiesToFetch = NSArray(object: "docID") request.returnsObjectsAsFaults = false request.returnsDistinctResults = true var results:NSArray = context.executeFetchRequest(request, error: nil) for data in results { var thisData = data as MedicalData println(thisData.docID) } I want to get distinct

Not totally sure why this isn't working now, i thought it had been working previously. Does anyone see an issue with this FetchRequest construction? - (NSArray *)entriesForDate:(NSDate *)date { NSFetchRequest *request = [[NSFetchRequest alloc]initWithEntityName:@"Entry"]; NSPredicate *predicate = [NSPredicate predicateWithFormat:@"ANY addedOn.unique like %@", [T3Utility identifierForDate:date]]; request.predicate = predicate; NSError *error = nil; NSArray *matches = [self.database.managedObjectContext executeFetchRequest:request error:&error]; return matches; } Again, i'm 99% sure that this

My situation is simple: I have some records in my core data store. One of their attributes is a string called "localId". There's a point where I'd like to find the record with a particular localId value. The obvious way to do this is with an NSFetchRequest and an NSPredicate. However, when I set this up, the request returns zero records. If, however, I use the fetch request without the predicate, returning all records, and just loop over them looking for the target localId value, I do find the record I'm looking for. In other words, the record is there, but the fetch request can't find it. My

Aim: I would like to fetch the value of one attribute (from an entity) from the database (core data) into an array. Example Entity Name = Employees Attribute = employeeID I just want all the employeeIDs populated into an array / set. Question Given below is my implementation, I just feel it is kind of a round about way, I would like to know if there is a better way to do this. Code NSFetchRequest *fetchRequest = [NSFetchRequest fetchRequestWithEntityName:@"Employees"]; fetchRequest.resultType = NSDictionaryResultType; [fetchRequest setPropertiesToFetch:[NSArray arrayWithObjects:@"employeeID",