Question

another one ive been at for hours. Im having a major problem getting my app to ‘see’ my Entity in my database…

I have created code in my appDelegate to set up Core Data. The first view I boot to can access this data (read / write) with no problems. If I then try to access the database from another viewController its as if it doesn’t exist.

I have all the correct @property’s set up in my viewController header files:

@property (strong, nonatomic) NSFetchedResultsController *fetchedResultsController;
@property (strong, nonatomic) NSManagedObjectContext *managedObjectContext;

I have also got each viewController to be:

    NSFetchedResultsControllerDelegate

• I have imported the relevant header files in the .m files where I want to access the entity.

This is the error I get:

'+entityForName: could not locate an NSManagedObjectModel for entity name MyEntityName'

The confusing thing is that if I change the start up view from the appDelegate is has no problems seeing the Entity in whichever view controller I choose. It seems like it is ‘injecting’ it into the first one, but then thats it.

Im guessing I need to set up / alloc init a NSManagedObject and reference it back to my Entity, but I have no idea how to do this.

Any clues?

Thanks

Answer 1

So I guess what you need to do is pass the managedObjectContext like this

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender;
{
    if ([[segue identifier] isEqualToString:@"theIdentifier"]) {
        UINavigationController *navigationController = (id)[segue destinationViewController];

        MySecondViewController *topViewController = [navigationController topViewController];
        topViewController.managedObjectContext = self.managedObjectContext;
    }
}