Question

I have CoreData in my app, with an Entry class, which contains an NSOrderedSet of Media classes.

I then have this code, for adding a new Media item to the NSOrderedSet:

-(void)addImage:(UIImage *)image isInPhotoLibrary:(BOOL)isInPhotoLibrary {

    Media *media = [[Media alloc] init];
    media.type = @"Image";
    media.originalImage = UIImageJPEGRepresentation(image, 1.0);
    media.isInPhotoLibrary = [NSNumber numberWithBool:isInPhotoLibrary];

    [self addMediaObject:media];

}

Will this automatically save the changes, or will I have to do it myself. If so, will i then need to pass in a context to do this, or is there another way?

Answer 1

No it won’t.. If you want to save changes to Database in Core data you gotta call save function for that.. I assume Media is kind of NSManagedObject class. To save the changes to persistent store you have to call save method . Until then the changes are just temporary present on your scratch board/ ManagedObjectContext.

This is how I save changes:

Worker *worker =  (Worker *)[NSEntityDescription insertNewObjectForEntityForName:@"Worker" inManagedObjectContext:self.managedObjectContext];

worker.name=txtContact.text;
worker.address=txtAddress.text;
worker.zipCode=txtZip.text;
worker.city=txtCity.text;
worker.mobile=txtMobile.text;

 NSError *error;

if (![managedObjectContext save:&error]) 
{
    NSLog(@"Whoops, couldn't save: %@", [error localizedDescription]);
}