There is a similar question in stack overflow already but it doesn't work for me. There is a use case in my application where I have to observe the database changes to perform some operation. To r...

I would really like to avoid using NSManagedObjectID as a way to connect my model structs to their CoreData objects. I mean something like this: Say I have a Book entity in CoreData and then I have...

I am creating a framework that allows me to use Core Data. In the framework's test target, I have configured a data model named MockModel.xcdatamodeld. It contains a single entity named MockManaged...

I'm having a wired problem with core data. With Swift3 in iOS 10 I get the managed object context each time I am fetching or storing data with func getContext () -> NSManagedObjectContext { l...

I have what I assume is a fairly standard setup, with one scratchpad MOC which is never saved (containing a bunch of objects downloaded from the web) and another permanent MOC which persists object...

I've read the following Behavior differences between performBlock: and performBlockAndWait:? But wasn't able to find an answer to my question. The following code is picked up from an RayWenderlic...

As pointed out in another question on SO (and the Apple docs), NSManagedObject instances do not hold a strong reference to the NSManagedObjectContext from which they originated. On first blush, thi...

I am have an entity in core data and I try to update it from two different context. I am storing managedObjectID of my managed object which I need to update as it is thread safe. Before updating my...

I'm reading Delete/Reset all entries in Core Data?. If I follow the steps below, I get an unexpected result: Call the code below Then query an entity in the simulator, I will get an entity bac...

In my application, I have a NSFetchedResultsController to load Core Data objects in a UITableView. The fetch request associated with this FRC uses the new viewContext property available for the NSP...

I am trying use CoreData, but when I add it to my project I only get two new methods : - (NSPersistentContainer *)persistentContainer and - (void)saveContext Now I can't get old methods to w...

I'm trying to efficiently batch delete a lot of NSManagedObjects (without using an NSBatchDeleteRequest). I have been following the general procedure in this answer (adapted to Swift), by batching ...

I have a large import task I need to do with core data. Let say my core data model look like this: Car ---- identifier type I fetch a list of car info JSON from my server and then I want to sy...

My situation is: I have a multi-threaded app with core-data database, managing multiple contexts. In my context Hieratchy I have a Root Saving Context, and child contexts where I fetch data and mak...

I have a pair of Core Data Entities of One-to-Many relationship. Department <-(optional) (delete rule: Cascade) (optional)->> Item Item <-(optional) (delete rule: Nullify) (optional)-...

I have been trying to figure out this problem for 2 days now. I keep getting an error when I try to save. //self.data is NSManagedObject. kAppDelegate.moc is the managed object context. self.data ...

Some users of mine are encountering a CoreData error when performing a save. I haven't been able to find any information online about this error or how to symbolicate the stack trace. The error me...

I have a NSManagedObjectContext in which I have a number of subclasses of NSManagedObjects such that some are containers for others. What I'd like to do is watch a top-level object to be notified o...

We have been trying to debug a Core Data multiple-context/threading issue wherein merging a Core Data save notification into our main thread NSManagedObjectContext is sporadically crashing the app....

Okay so I am experiencing a frustrating issue that I would love some help or advice with. Basically I have an app that I'm developing that utilizes Core Data to store numerous user properties. What...

I get the following error: 'NSInvalidArgumentException', reason: 'Illegal attempt to establish a relationship 'condition' between objects in different contexts when running my iphone app. ...

I am using a Private Managed Object Context to create some new objects into the persistent store, then after saving the private MOC, merging them into the main MOC using mergeChangesFromContextDidS...

I have a fetchedResultsController with a predicate, where "isOpen == YES" When calling for closeCurrentClockSet, I set that property to NO. Therefore, it should no longer appear on my tableView. ...

I have two managed object contexts that share the same persistent store coordinator: One with NSMainQueueConcurrencyType for the main thread and One that's NSPrivateQueueConcurrencyType for doin...

I am trying to implement CoreData in ios Application,Now I want to Fetch all records from Entity MUSTHAFA My NSManagedObjectedSubClass is MUSTAHFA MUSTHAFA.m #import <Foundation/Foundation...