CoreData error: +entityForName: could not locate an NSManagedObjectModel for entity name

Question

I've been struggling with CoreData for a few days, but I keep getting this error:

'NSInternalInconsistencyException', reason: '+entityForName: could not locate an NSManagedObjectModel for entity name.

I have checked the entity name and what I wrote on my code and they're the same. I also recreated the object data-model and even delete the app from the simulator but nothing seems to fix it. Here's what I have:

method to save into CoreData:

-(IBAction)save:(id)sender {
    NSManagedObject * newNews = [NSEntityDescription insertNewObjectForEntityForName:@"NewsStand"
    inManagedObjectContext:coredata.managedObjectContext];
    [newNews setValue:news_title forKey:@"story_title"];
    [newNews setValue:news_desc forKey:@"story_desc"];
    [newNews setValue:news_image  forKey:@"story_image"];
    [newNews setValue:test  forKey:@"story_url"];
    [coredata commit];
    NSLog(@"data saved!!!!");
}

I have implemented all methods of core data in a separated class:

applicationDocumentsDirectory,  
- (NSPersistentStoreCoordinator *)persistentStoreCoordinator, 
- (NSManagedObjectModel *)managedObjectModel, 
- (NSManagedObjectContext *)managedObjectContext

TechZen TechZen · Accepted Answer · 2011-08-17T22:50:50

This is a fairly common error and it has three causes:

Misspelling the entity name e.g. NewsStand instead of NewsStands.
Having a nil managed object context
Having no or the wrong managed object model loaded.

(1) is the most common but (3) is more common than (2). You can check that you are loading the right model with the keypath:

aManagedObjectContext.persistentStoreCoordinator.managedObjectModel.entities

then check the entity's names.

CoreData error: +entityForName: could not locate an NSManagedObjectModel for entity name

6 Answers