ios - RKEntityMapping 行で RestKit がクラッシュする

Question

私はObjective-Cが初めてで、RestKitに非常にこだわっています。Web サーバーで JSON からのデータを使用して非常に単純なものを作成しようとしてUITableViewいますが、しばらく立ち往生しています。

これは私の単純な JSON です。

{
    "restaurants": [
        {
            "id": "27",
            "franchise_name": "Franchise 1",
            "branch_name": "Branch 1",
            "branch_phone": "0200 111 0000",
            "cuisine": "Salad",
            "cooking_time": "15",
            "is_open": 1
        },
        {
            "id": "97",
            "franchise_name": "Franchise 2",
            "branch_name": "Branch 2",
            "branch_phone": "0207 222 0000",
            "cuisine": "Healthy",
            "cooking_time": "10",
            "is_open": 1
        }
    ]
}

これは私のコアデータモデルです:

    Entities: Restaurant
    Attributes: branchName -> String
    franchiseName -> String
    id -> integer 16
    readyTime-> integer 16

ビューコントローラーに次のコードがあります。ではviewDidLoad、RKEntityMapping例外が発生します。

RKManagedObjectStore *managedObjectStore = [RKManagedObjectStore defaultStore];

RKEntityMapping *entityMapping = [RKEntityMapping mappingForEntityForName:@"Restaurant" inManagedObjectStore:managedObjectStore]; //THIS LINE CAUSES THE CRASH

[entityMapping addAttributeMappingsFromDictionary:@{
                                                    @"id":             @"id",
                                                    @"cooking_time":   @"readyTime",
                                                    @"branch_name":    @"branchName",
                                                    @"franchise_name": @"franchiseName"}];

RKLogConfigureByName("RestKit/Network", RKLogLevelTrace);

RKResponseDescriptor *responseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:entityMapping pathPattern:@"/api/restaurants" keyPath:nil statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)]; //I GET AN ISSUE HERE AS WELL INVOLVING responseDescriptorWithMapping BEING DEPRECIATED.

NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http//mywebserver.com/api/resturants"]];

RKManagedObjectRequestOperation *managedObjectRequestOperation = [[RKManagedObjectRequestOperation alloc] initWithRequest:request responseDescriptors:@[ responseDescriptor ]];

managedObjectRequestOperation.managedObjectContext = self.managedObjectContext;

[[NSOperationQueue currentQueue] addOperation:managedObjectRequestOperation];

いくつかのエラーメッセージがありますが、実際にはどれも得られません:

    NSAssert(objectClass, @"Cannot initialize an entity mapping for an entity with a nil managed object class: Got nil class for managed object class name '%@'. Maybe you forgot to add the class files to your target?", [entity managedObjectClassName]);

コンソールで:

*** Assertion failure in -[RKEntityMapping initWithEntity:],