Question

There is something I dont understand in core data.
I have created a NSManagedDocument, made a change, and saved it.
Then I created another one and opened the file I saved.
From what I understand the NSManagedDocument should have the change I mad, but it doesn’t.

here is the code I wrote:

NSURL *url = [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] lastObject];
url = [url URLByAppendingPathComponent:@"Data Base"];
// url is now "<Documents Directory>/Default Photo Database"
self.dataBase = [[UIManagedDocument alloc] initWithFileURL:url];

if (self.dataBase.documentState == UIDocumentStateClosed) {
    [self.dataBase openWithCompletionHandler:^(BOOL success) {
    }];
} 
Position *pos = [NSEntityDescription insertNewObjectForEntityForName:@"Position" inManagedObjectContext:self.dataBase.managedObjectContext];
pos.name = @"positon 1";


[self.dataBase saveToURL:self.dataBase.fileURL forSaveOperation:UIDocumentSaveForOverwriting completionHandler:^(BOOL success){

}];

self.dataBase = [[UIManagedDocument alloc] initWithFileURL:url];

if (self.dataBase.documentState == UIDocumentStateClosed) {
    [self.dataBase openWithCompletionHandler:^(BOOL success) {
    }];
} 
pos = [NSEntityDescription insertNewObjectForEntityForName:@"Position" inManagedObjectContext:self.dataBase.managedObjectContext];
pos.name = @"position 2";

as far as i understand I should have 2 objects for entity “Position” by now, but I only have the last one, why is that?

what am I missing here?

Answer 1

I don’t know why, but as soon as I moved my code to the AppDelegate it was solved…