NSManagedObjectModel initWithContentsOfURL returns nil eventhough the modelURL is valid

iphone nsmanagedobject
newDeveloper picture newDeveloper · Jul 19, 2011 · Viewed 8.8k times · Source

my NSManagedObjectModel is returning nil eventhough the path is correct.

        NSString *modelKey = [NSString stringWithFormat:@"/%@/Model", name];
    NSString *modelPath = [((Configuration *)[Configuration shared]) stringEntry:modelKey];
    NSURL *modelURL = nil;
    if ( ! [modelPath contains:@"://"] ) {
        modelPath = PathForBundleResource( modelPath );
        modelURL = [NSURL fileURLWithPath:modelPath];
    }
    NSManagedObjectModel *m = [[NSManagedObjectModel alloc] initWithContentsOfURL:modelURL];

NSString *PathForBundleResource(NSString *relativePath) 

    NSString* resourcePath = [[NSBundle mainBundle] resourcePath];
return [resourcePath stringByAppendingPathComponent:relativePath];

I've reset the simulator, did a clean build but nothing helped.

I'm new to iPhone programming (core data in particular).

Would appreciate any help.

Edit: I've edited the original post regarding the xcdatamodeld file. It wasn't linked up properly initially but now it is and still having the same problem.

Edit 2: Apparently the name of the xcdatamodel had some variations to the name of the xcdatamodel after linkage. It's working now. Feeling so stupid. Don't know how to delete this question.

Answer

IPhone Guy picture IPhone Guy · Apr 28, 2012

I had the same problem after I renamed .xcdatamodeld file. The problem was solved by closing and reopening the Xcode client.

Related questions

core data - the primary key id of a row in the database

Suppose I have a list of books stored in Core Data. I want to search for a book by it's primary key ID. I know the sqlite file created by Core Data has an ID column in each table, but …

Read More
Removing a specific entry/row from Core-Data

I'm using core data in my app, and i'm confused when it comes to removing certain rows or entries from the core data storage. I insert some products in to the storage like so: NSManagedObject *Product = [NSEntityDescription insertNewObjectForEntityForName:@"Product" inManagedObjectContext:…

Read More
Is there a way to instantiate a NSManagedObject without inserting it?

I have a user interface to insert a Transaction. once the user clicks on a plus he gets the screen and i want to instantiate my Core Data NSManagedObject entity let the user work on it. Then when the user …

Read More