我跟着RestKit文档中的所有步骤将其添加到一个项目,但是当我尝试启动我的应用程序是在这一行application:application didFinishLaunchingWithOptions:
停止:如何识别“找不到属性”异常的原因?
entityMapping.identificationAttributes = @[@"_id"];
在此之前的代码是:
NSURL *modelURL = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"MyModel" ofType:@"momd"]];
NSManagedObjectModel *managedObjectModel = [[[NSManagedObjectModel alloc] initWithContentsOfURL:modelURL] mutableCopy];
RKManagedObjectStore *managedObjectStore = [[RKManagedObjectStore alloc] initWithManagedObjectModel:managedObjectModel];
// Init the Core Data stack
[managedObjectStore createPersistentStoreCoordinator];
NSPersistentStore __unused *persistentStore = [managedObjectStore addInMemoryPersistentStore:&error];
NSAssert(persistentStore, @"Faild to add persistent store: %@", error);
[managedObjectStore createManagedObjectContexts];
// Set the default shared store instance
[RKManagedObjectStore setDefaultStore:managedObjectStore];
// Configure the object manager
RKObjectManager *objectManager = [RKObjectManager managerWithBaseURL:[NSURL URLWithString:@"http://localhost:9090"]];
objectManager.managedObjectStore = managedObjectStore;
[RKObjectManager setSharedManager:objectManager];
RKEntityMapping *entityMapping = [RKEntityMapping mappingForEntityForName:@"Pool" inManagedObjectStore:managedObjectStore];
[entityMapping addAttributeMappingsFromDictionary:@{
@"id": @"_id",
@"about_url": @"aboutURL",
@"closed": @"closed",
@"created_on": @"createdOn"
}];
entityMapping.identificationAttributes = @[@"_id"];
例外是越来越抛出RKEntityMapping.m上线100(if (!attribute) [NSException raise:NSInvalidArgumentException format:@"Invalid attribute '%@': no attribute was found for the given name in the '%@' entity.", attributeOrName, [entity name]];
),这是RKArrayOfAttributesForEntityFromAttributesOrNames
一部分。
当我po [entity name]
它说:“游泳池”,但我有我的.xcdatamodeld池实体。
我可能会在别的地方寻找这个错误的原因是什么?
为什么'@ [@“_ id”]'而不是'@ [@“id”]'? – 2013-05-14 02:46:21
我最初有@ [@“id”],但JSON中的键是'_id',所以我想这可能是问题所在,并改变了这一行。 – 2013-05-14 02:52:31
“Pool”实体中的“id”属性名称是什么? – 2013-05-14 02:54:31