Question

I am trying to reset my Core data database when the user sets up there current model.

I have tried various options but none have correctly worked.

I want the Core data and all it’s data (Including persistent data) to be deleted before any new data is added.

I have been using SQLite database browser Version 2.0b1 to check that the data has correctly been deleted. Also I have reset the simulator before running each test.

I am looking for a concise solution, I have searched over stackoverflow to find a correct method of doing it.

This solution resulted in the database being completely removed but no new one created.
https://stackoverflow.com/a/11812997/1565615

This solution didn’t delete all of the data as previous sessions still existed and data that had just been created.
https://stackoverflow.com/a/1078306/1565615

Answer 1

i am using it like this:

1. delete all values in coreData
2. save the context, so the values are really deleted.
3. save your new values and save the context again.

---

1. i am using this code to delete the values from each entity:

---

NSError *error = nil;  

NSManagedObjectContext *context = [self managedObjectContext];
NSFetchRequest *fetchREntityUser            = [[[NSFetchRequest alloc] init] autorelease];
NSEntityDescription *entityUser         = [NSEntityDescription entityForName:@"EntityUser" inManagedObjectContext:context];

[fetchREntityUser           setEntity:entityUser];


NSArray *fetchedObjUser         = [context executeFetchRequest:fetchREntityUser error:&error];

if (error) {
    XLog(@"deleteCoreDataEntitys Error: %@", [error localizedDescription]);
}


for (NSManagedObject *CDentityUser in fetchedObjUser) {
    [context deleteObject:CDentityUser];
}


[context save:&error];