How to completely clear out a Core Data model?

Question

How I could completely clear out EVERYTHING in a Core Data model i.e remove all objects for all entities?

I will be using the code to clear out the saved history in a the model.

score 10 · Accepted Answer · answered Jun 23 '14 at 11:16

Here is another way to do...

NSManagedObjectContext *context = [appDelegate managedObjectContext];
            NSFetchRequest * allMovies = [[NSFetchRequest alloc] init];
            [allMovies setEntity:[NSEntityDescription entityForName:@"Movies" inManagedObjectContext:context]];
            [allMovies setIncludesPropertyValues:NO]; //only fetch the managedObjectID

            NSError * error = nil;
            NSArray * movies = [context executeFetchRequest:allMovies error:&error];
            //error handling goes here
            for (NSManagedObject * movie in movies) {
                [context deleteObject:movie];
            }
            NSError *saveError = nil;
            [context save:&saveError];

It will clear all the objects.

score 2 · Answer 2 · answered Apr 01 '11 at 22:40

2

Delete the .sqlite DB Core Data creates (it's probably stored on your /Documents directory) and get your app to re-create it.

answered Apr 01 '11 at 22:40

Jamie Chapman

4,229
5
29
47

You specify the URL for the persistent store when you create the persistent store, so you should already know where the file is. You can use NSFileManager's -removeItemAtPath:error: method to delete the file. – Caleb Apr 02 '11 at 02:25

score 0 · Answer 3 · edited May 23 '17 at 12:22

0

Here is a good answer to this question.

Delete/Reset all entries in Core Data?

Then just make sure to re-create the store.

edited May 23 '17 at 12:22

Community

1
1

answered Apr 02 '11 at 22:03

Mike A

2,501
2
23
30

How to completely clear out a Core Data model?

3 Answers3