After updating Core Data model I receive a "unrecognized selector" error

Question

I have Core Data model and it work fine, but I need to add new attribute. I click on my .xcdatamodel and go to Editor/Add Model Version. Now I add new attribute and add this in .h and .m file.

When I run application it give me an error :

[CubeCategory setStoreDescription:]: unrecognized selector sent to instance 0x1657bca0

Now, even if I delete application from device and instal from fresh it still give me same error.

What I am doing wrong?

EDIT :

I have set my new model as current model :

My model looks like :

And Class looks like :

.h :

@interface CubeCategory : NSManagedObject

@property (nonatomic, retain) NSNumber * categoryID;
@property (nonatomic, retain) NSNumber * position;
@property (nonatomic, retain) NSString * title;
@property (nonatomic, retain) NSNumber * type;
@property (nonatomic, retain) NSString * storeDescription;
@property (nonatomic, retain) NSNumber * lock;
@property (nonatomic, retain) NSSet *cube;
@property (nonatomic, retain) Server *server;
@end

@interface CubeCategory (CoreDataGeneratedAccessors)

- (void)addCubeObject:(Cube *)value;
- (void)removeCubeObject:(Cube *)value;
- (void)addCube:(NSSet *)values;
- (void)removeCube:(NSSet *)values;

-(id)init:(NSManagedObjectContext*)Context;
-(void)save:(NSManagedObjectContext*)Context;

@end

and .m

@implementation CubeCategory

@dynamic categoryID;
@dynamic position;
@dynamic title;
@dynamic type;
@dynamic cube;
@dynamic server;
@dynamic lock;
@dynamic storeDescription;

-(id)init:(NSManagedObjectContext*)Context{
    self = [NSEntityDescription insertNewObjectForEntityForName:@"CubeCategory" inManagedObjectContext:Context];
    return self;
}

-(void)save:(NSManagedObjectContext*)Context{
    NSError *error;
    if (![Context save:&error]) {
        NSLog(@"Whoops, couldn't save: %@", [error localizedDescription]);
    }
}


@end

In my AppDelegate I have set :

- (NSPersistentStoreCoordinator *)persistentStoreCoordinator
{
    NSDictionary *options = @{
                              NSMigratePersistentStoresAutomaticallyOption : @YES,
                              NSInferMappingModelAutomaticallyOption : @YES
                              };
 ...

     if (![__persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:options error:&error]) {
        NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
     }

EDIT 2:

- (NSManagedObjectModel *)managedObjectModel
{
    if (__managedObjectModel != nil) {
        return __managedObjectModel;
    }
    NSURL *modelURL = [[NSBundle mainBundle] URLForResource:@"Model" withExtension:@"mom"];
    __managedObjectModel = [[NSManagedObjectModel alloc] initWithContentsOfURL:modelURL];
    return __managedObjectModel;
}

// Returns the persistent store coordinator for the application.
// If the coordinator doesn't already exist, it is created and the application's store added to it.
- (NSPersistentStoreCoordinator *)persistentStoreCoordinator
{
    NSDictionary *options = @{
                          NSMigratePersistentStoresAutomaticallyOption : @YES,
                          NSInferMappingModelAutomaticallyOption : @YES
                          };


    if (__persistentStoreCoordinator != nil) {
        return __persistentStoreCoordinator;
    }

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

    NSError *error = nil;
    __persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]];
    if (![__persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:options error:&error]) {
        NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
    }

    return __persistentStoreCoordinator;
}

Answer 1

You need to create persistentStoreCoordinator with

 NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:
                         [NSNumber numberWithBool:YES],    NSMigratePersistentStoresAutomaticallyOption,
                         [NSNumber numberWithBool:YES], NSInferMappingModelAutomaticallyOption, nil];

Also. Did you create updated managed object with Editor/Create NSManagedObject subClass

Answer 2

to ensure the light migration between the previous verison and the new version of your Core Data model you have to do the following steps :

1-Add Model Version I think you did that already 2-set the persistentStoreOptions of your UIManagedDocument as follows

   NSDictionary *options = @{
                              NSMigratePersistentStoresAutomaticallyOption : @YES,
                              NSInferMappingModelAutomaticallyOption : @YES
                              };
    self.myAppiPhoneDatabase.persistentStoreOptions = options;

Ideally you have to set the persistentStoreOptions when you Open or create the document

Answer 3

I've forgot to synthesize the new variable (eg: customColor, added in model NSObject and NSManagedObject in my case I'm using both) using @synthesize which makes the crash. If we are not synthesizing the variable we need setter method when accessing it, which is the root of my crash. It might help someone.

Note: In my case its not the migration problem.