nsmanagedobject

I am using Core Data, and want to set an auto_increment ID as one of the fields which will be unique. Is it possible to set auto_increment in iOS using core data? Can anyone help me with a small example of how to implement this? Below is the code through which I am inserting records in database. In the first field "id", i want to set it as auto_increment and not manually insert it. - (NSManagedObjectContext *)managedObjectContext { NSManagedObjectContext *context = nil; id delegate = [[UIApplication sharedApplication] delegate]; if ([delegate performSelector:@selector(managedObjectContext)]) {

I have a subclass of the CoreDataTableViewController (subclass of UITAbleViewController dome by the people on Stanford done to link CoreData and TableViews). On this Class, I want to perform a fecth, sorting by an attribute called "definition" and the code which executes it is the following: - (void)setupFetchedResultsController{ NSFetchRequest *request = [NSFetchRequest fetchRequestWithEntityName:self.entity]; request.propertiesToFetch=[NSArray arrayWithObject:@"definition"]; request.returnsDistinctResults=YES; NSPredicate *predicate1 = [NSPredicate predicateWithFormat:@"%K != nil", @

I have a strange problem in my Core Data app. I have three entities in my app, but today I found a problem with one of them. My problematic entity is called Invoice and it has many attributes, including Products . It's encoded NSArray of NSDictionaries (via default NSValueTransformer). Everything works fine - i create my invoice, its client, its products, etc. Everything works. But , when I choose my invoice from a list and then try to edit its products and click 'Save' button, my save works only until my app gets terminated. The problem is only with my products array - the rest (e.g. payment

after I insert a ManagedObject into a context I'd like to fetch it later but before saving the context (I'd save after all objects are inserted). It appears that querying the context later with a fetch concerning those objects returns nothing if the context wasn't previously saved. Is there a way to save only in the end ?(I guess i can save my objects in an array or dictionary and query that but i thought coredata would do this for me) Try this: [myFetchRequest setIncludesPendingChanges:YES]; From the documentation : Sets if, when the fetch is executed, it matches against currently unsaved

Xcode 6 has had a ton of bugs. But I'm not quite sure if this is a bug or not. It might not be since this is something I'm just now learning. My issue is, any time I try to instantiate my subclass of NSManagedObject, I do not have the option to pass the entity: NSEntityDescription and NSManagedContext: insertIntoManagedContext argument to the constructor, Xcode says "Extra Argument 'entity' in call" I created a new Xcode project from scratch, just to see if I could re-create the problem in a smaller, minimal project. ToDoList.Item is set as the Item entity class in the Data Model Inspector.

I have been getting a strange crash reported by lots of users through HockeyApp with the following stack trace. It seems to have something to do with NSManagedObject being released in a different dispatch queue ... but I don't get any symbolication for where the problem might be. It seems like a memory management issue, but I'm using ARC so not sure how it would over-release an NSManagedObject. This is the crash report I get (the main thread shows different traces at different times): Code Type: ARM-64 Parent Process: launchd [1] Date/Time: 2014-05-12T05:43:54Z OS Version: iPhone OS 7.0.6