Core Data Deletion Unsuccessful *easy fix?* - objective-c

Question

I have a simple XCDataModel that contains one Entity with One Attribute. Essentially, I am saving a series of Dates.
Now, I Know I am adding the NSDates properly because I run a fetch request after adding them and run through the results like so:
for (NSManagedObject *info in fetchedObjects) {
NSLog(#"Name: %#", [info valueForKey:#"attribute"]);
}
And every additional NSDate is accounted for. Example from Log:
2012-06-19 12:40:38.531 Arts Days[47194:16103] Name: 2013-03-27 04:00:00 +0000
2012-06-19 12:40:38.531 Arts Days[47194:16103] Name: 2013-03-01 05:00:00 +0000
2012-06-19 12:40:38.532 Arts Days[47194:16103] Name: 2013-01-01 05:00:00 +0000
Now, when I try to delete an object from Core Data, it proves unsuccessful (by running the same fetch and running through the results again).
Here is the fetch:
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription entityForName:#"Entity" inManagedObjectContext:self.managedObjectContext];
[fetchRequest setEntity:entity];
[fetchRequest setFetchBatchSize:366];
NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:#"date" ascending:NO];
NSArray *sortDescriptors = [NSArray arrayWithObjects:sortDescriptor, nil];
NSError *error = nil;
[fetchRequest setSortDescriptors:sortDescriptors];
NSArray *fetchedObjects = [self.managedObjectContext executeFetchRequest:fetchRequest error:&error];
for (NSManagedObject *object in fetchedObjects) {
if ([[object valueForKey:#"date"] isEqualToDate:date]) {
[managedObjectContext deleteObject:object];
}
}
if (![managedObjectContext save:&error]) {
NSLog(#"Unresolved error %#, %#", error, [error userInfo]);
}
Also, the NSLog with Unresolved error contains nil nil...
Do you know what I am doing wrong?

Answer 1

It appears you use two different NSManageObjectContext instances. self.managedObjectContext (an ivar) to set up your fetch request and perform the fetch, but a local instance to do the deleteObject: and save: operations. The local instance managedObjectContext is probably nil and not referring to the same object as the ivar.