Question

这是我的第一个问题：）

好的，所以我通过cocoapods获得了ReskKit 0.23.3的专业版。我使用RestKit / CoreData。

我获取一个URL，结果被映射到我的对象，并被核心数据正确保存。我想使用键值验证来检查一些已经保留的值。我读到我可以在validateKey:error:上使用方法NSManagedObject。不知何故，它永远不会被称为。我很沮丧......

这是我的文件（为简单起见，我将逻辑代码连接到一个平面文件中）：

JSON响应/集合/ {id}

{
    "id": "00000000-0000-0000-0000-00000000000",
    "image_url": "http://server/image.png",
    "name": "Collection C",
    "etag": 42,
    "ctag": 42
}

Collection.h

@interface Collection : NSManagedObject

@property(nonatomic, strong) NSString *collectionId;
@property(nonatomic, strong) NSString *name;
@property(nonatomic, strong) NSURL *imageUrl;
@property(nonatomic, strong) NSNumber *etag;
@property(nonatomic, strong) NSNumber *ctag;

@end

Collection.m

@implementation Collection

@dynamic collectionId, name, imageUrl, etag, ctag;

- (BOOL)validateCollectionId:(id *)ioValue error:(NSError **)outError {
    NSLog(@"Validating id");
    NSLog(@"Coredata collection id: %@", self.collectionId);
    NSLog(@"GET collection id: %@", (NSString *)*ioValue);
    return YES;
}

- (BOOL)validateEtag:(id *)ioValue error:(NSError **)outError {
    NSLog(@"Validating etag");
    NSLog(@"Coredata collection etag: %@", self.etag);
    NSLog(@"GET collection etag: %@", (NSString *)*ioValue);
    return YES;
}

@end

代码

NSManagedObjectModel *managedObjectModel = [NSManagedObjectModel mergedModelFromBundles:nil];
RKManagedObjectStore *managedObjectStore = [[RKManagedObjectStore alloc] initWithManagedObjectModel:managedObjectModel];

[managedObjectStore createPersistentStoreCoordinator];
NSString *storePath = [RKApplicationDataDirectory() stringByAppendingString:@"/MyApp.sqlite"];
NSError *error;
NSPersistentStore *persistentStore = [managedObjectStore addSQLitePersistentStoreAtPath:storePath fromSeedDatabaseAtPath:nil withConfiguration:nil options:nil error:&error];
NSAssert(persistentStore, @"Failed to add persistent store with error: %@", error);

[managedObjectStore createManagedObjectContexts];

managedObjectStore.managedObjectCache = [[RKInMemoryManagedObjectCache alloc] initWithManagedObjectContext:managedObjectStore.persistentStoreManagedObjectContext];

[RKManagedObjectStore setDefaultStore:managedObjectStore];

NSURL *url = [NSURL URLWithString:@"http://server/api"];

RKObjectManager *objectManager  = [self managerWithBaseURL:url];
objectManager.requestSerializationMIMEType = RKMIMETypeJSON;
objectManager.managedObjectStore = [RKManagedObjectStore defaultStore];

RKEntityMapping *collectionMapping = [RKEntityMapping mappingForEntityForName:@"Collection" inManagedObjectStore:[RKManagedObjectStore defaultStore]];
[collectionMapping addAttributeMappingsFromDictionary:@{@"id": @"collectionId",
                                                        @"image_url": @"imageUrl"}];
[collectionMapping addAttributeMappingsFromArray:@[@"name", @"etag", @"ctag"]];
[collectionMapping setIdentificationAttributes:@[@"collectionId"]];

RKResponseDescriptor *collectionResponseDescriptors = [RKResponseDescriptor responseDescriptorWithMapping:collectionMapping
                                                                                                   method:RKRequestMethodGET pathPattern:@"collections/:collectionId"
                                                                                                  keyPath:nil
                                                                                              statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];
[objectManager addResponseDescriptor:collectionResponseDescriptor];

[objectManager getObjectsAtPath:@"collections/00000000-0000-0000-0000-00000000000" parameters:nil success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
    Collection *collection = (Collection *)[mappingResult.array firstObject];
    NSLog(@"Collection: %@", collection);
} failure:^(RKObjectRequestOperation *operation, NSError *error) {
    NSLog(@"Oh noes :(");
}];

输出

2014-09-13 12:39:04.242 MyApp[41958:607] I restkit:RKLog.m:33 RestKit logging initialized...
2014-09-13 12:39:05.028 MyApp[41890:607] Collection: <NSManagedObject: 0x9108a60> (entity: Collection; id: 0x94166d0 <x-coredata://6645F428-7631-45F0-A8AF-E2352C50F35E/Collection/p1> ; data: {
    collectionId = "00000000-0000-0000-0000-00000000000";
    ctag = 42;
    etag = 42;
    imageUrl = "http://server/image.png";
    name = "Collection C";
})

所以，我得到了我的Log with the Collection，但validate<Key>:error:方法中的NSLog都没有被触发......无法找出原因！

修改

有一些休息，我认为这是RKMappingOperation谁负责在我的对象上调用那些验证方法。确切地说，它是validateValue:atKeyPath:

RKMappingOperation.m

...
- (BOOL)validateValue:(id *)value atKeyPath:(NSString *)keyPath
{
    BOOL success = YES;

    if (self.objectMapping.performsKeyValueValidation && [self.destinationObject respondsToSelector:@selector(validateValue:forKeyPath:error:)]) {
        NSError *validationError;
        success = [self.destinationObject validateValue:value forKeyPath:keyPath error:&validationError];
        ...
    }
...

但self.destinationObject是NSManagedObject而不是Collection对象......

控制台

(lldb) po [self.destinationObject class]
NSManagedObject

我希望你能以正确的方式引导我:)谢谢！

Answer 1

您似乎未指定实体应在Core Data模型中使用Collection类。如果您没有指定任何内容，则默认情况下将使用NSManagedObject。

Demo image from the web

RestKit KVC验证不会调用验证方法

1 个答案: