nsfetchedresultscontroller

Is there a way to use a 'transient' field or something like that and in some way sort accordingly with a NSFetchedResultsController. I want to do the following: I have location of places in a database. When a person opens the list, I want to show the nearest place on top, an then sort accordingly to distance. But clearly,this depends on the users location, so I cannot use a static field. I was hoping to use a transient field, as you can use for the section headers. Is there anybody who can give a solution or workaround for this situation? You cannot use a transient property in a fetch request

I have two Entities in CoreData called User and Coupon, they are in Many-to-Many relationship. I wanted to fetch for all Coupons except those owned by user.userId = 1, where userId is NSString. I used: [NSPredicate predicateWithFormat:@"NOT(ANY couponOwners.userId = %@)", @"4"]; to be the predicate of my fetchedResultsController but not filtering with correct results. One of the User in couponOwners of the Coupon is still having userId = 4. Could somebody please help? I have been stuck for quite a while. Thanks in advance. Core Data predicates with "NOT ANY" do not work (that seem to be a Core

I have a UITableView that uses an NSFetchedResultsController as data source. The core data store is updated in multiple background threads running in parallel (each thread using it's own NSManagedObjectContext ). The main thread observes the NSManagedObjectContextDidSaveNotification notification and updates it's context with mergeChangesFromContextDidSaveNotification: . Sometimes it happens that the NSFetchedResultsController sends an NSFetchedResultsChangeUpdate event with an indexPath that does not exist anymore at that point. For example: The result set of the fetched results controller

I have a entity Person with a property personId (personId is unique) How can I fetch the Person with the max personId? (I want to fetch the person itself not the value of the property) You set the fetchLimit to 1 and sort by personId in descending order. E.g.: NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] initWithEntityName:@"Person"]; fetchRequest.fetchLimit = 1; fetchRequest.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"personId" ascending:NO]]; NSError *error = nil; id person = [managedObjectContext executeFetchRequest:fetchRequest error:&error].firstObject;

I have a problem that is almost identical to the problem described by this person here, but it hasn't get answered: http://www.cocoabuilder.com/archive/cocoa/312683-core-data-nested-managed-object-contexts-and-frequent-deadlocks.html#312683 Here is the problem: I have a parent MOC setup with NSPrivateQueueConcurrencyType and a persistent store coordinator set, it has a child MOC setup with NSMainQueueConcurrencyType. The idea being most of the long hard work and saves can be done on the private MOC freeing the main thread from blocking the UI. Unfortunately I seem to be running into a couple

I have a user interface to insert a Transaction. once the user clicks on a plus he gets the screen and i want to instantiate my Core Data NSManagedObject entity let the user work on it. Then when the user clicks on the Save button i will call the save function. so down to code: transaction = (Transaction *)[NSEntityDescription insertNewObjectForEntityForName:@"Transaction" inManagedObjectContext:self.managedObjectContext]; //even if i dont call save: its going to show up on my table [self.managedObjectContext save:&error] P.S i am using an NSFetchedResultsController on that table and I see