CODEWITHSUNDEEP
ioscore-datansmanagedobjectcontext
sayguh
sayguh

Reputation: 2550

Gah! Trying to reset Core Data. Works every second time?

Alright, so my app delegate creates all the Core Data stuff, and I send to my first view controller.

My first view controller is a NSURLConnectionDelegate... in the connectionDidFinishLoading method, I would like to erase the persistentStore and recreate it... and then parse/repopulate it from an XML file.

Here is my connectionDidFinishLoading code:

-(void)connectionDidFinishLoading:(NSURLConnection *)connection {

//I believe I should nil out the context...
managedObjectContext = nil;

//Erase the persistent store from coordinator and also file manager.
NSError *error = nil;
NSPersistentStore *store = [self.persistentStoreCoordinator.persistentStores lastObject];
NSURL *storeURL = store.URL;
[persistentStoreCoordinator removePersistentStore:store error:&error];
[[NSFileManager defaultManager] removeItemAtURL:storeURL error:&error];


//Make new persistent store and add to the coordinator  
if (![self.persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:nil error:&error]) {
}
else {
    //Store is readied, now recreate the managedObjectContext
    id appDelegate = (id)[[UIApplication sharedApplication] delegate];
managedObjectContext = [appDelegate managedObjectContext];

   //Call the parser!
    [self parseXML];
}  
}

I know there's something wrong here... just can't figure out what. It works every second time I Build/Run. The error comes when I attempt to save the managedObjectContext in my parser methods

Can anyone provide the sample code on how I can fix this?

Thanks in advance,

Upvotes: 1

Views: 846

Answers (1)

sayguh
sayguh

Reputation: 2550

I was able to get this working

(in my view controller)

-(void)connectionDidFinishLoading:(NSURLConnection *)connection {

id appDelegate = [[UIApplication sharedApplication] delegate];
[appDelegate resetCoreData];

self.managedObjectContext = [appDelegate managedObjectContext];
[self parseXML];   
}

(in my app delegate)

- (void)resetCoreData;
{

NSURL *storeURL = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:@"deleteme.sqlite"];

NSFileManager *fileManager = [NSFileManager defaultManager];


    [fileManager removeItemAtURL:storeURL error:NULL];

    NSError* error = nil;

    if([fileManager fileExistsAtPath:[NSString stringWithContentsOfURL:storeURL encoding:NSASCIIStringEncoding error:&error]])
    {
        [fileManager removeItemAtURL:storeURL error:nil];
    }

self.managedObjectContext = nil;
self.persistentStoreCoordinator = nil;

}

Upvotes: 1

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