URL method does not work on 3.1.3 (generated by Core Data)

I have some issues with getting my app running on my iPhone 1G 3.1.3.

- (NSPersistentStoreCoordinator *)persistentStoreCoordinator
{
    if (__persistentStoreCoordinator != nil)
    {
        return __persistentStoreCoordinator;
    }

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

This is copied from the code generated by xcode when I use Core Data. How can I fix the URLByAppendingPathComponent method to something that works? Should I store the path returned by applicationDocumentsDirectory-method and make a new NSURL with开发者_高级运维 that path + MyTest.sqlite or is there a better way. Thank you

Assuming [self applicationDocumentsDirectory] is an NSURL

NSString *docsDirectoryString = [[self applicationDocumentsDirectory] absoluteString]; NSString *storePathString = [docsDirectoryString stringByAppendingPathComponent:@"MyTest.sqlite"];

NSURL *storeURL = [NSURL URLWithString:storePathString];