Question

我在使用RestKit 0.20pre6发布NSManagedObject时遇到问题，导致在我的Rails站点上使用nil值创建一个条目。我怀疑是mapper，但我已经正确地设置了我的RK对象。很少有例子和有限的支持。这个例子涉及NSObjects而不是CoreData，因此我不得不做出一些假设。

这是我的发布代码，后跟控制台输出。该应用程序从服务器获取对象。

        // Sync the added object to the server
    // ****************************************

    RKObjecMapping *responseMapping = [RKObjectMapping mappingForClass:[Event class]];
//  RKEntityMapping *responseMapping = [RKEntityMapping mappingForEntityForName:@"Event" inManagedObjectStore:self.managedObjectStore];
    [responseMapping addAttributeMappingsFromDictionary:@{
     @"id": @"eventId",
     @"name": @"name",
     @"amount": @"amount",
     @"length": @"length",
     @"updated_at": @"updatedAt",
     @"created_at": @"createdAt",
     @"latitude": @"latitude",
     @"longitude": @"longitude",
     @"thumbnail": @"thumbnail",
     @"airTemp": @"airTemp",
     }];

    NSIndexSet *statusCodes = RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful); // Anything in 2xx
    RKResponseDescriptor *eventDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:responseMapping
                                                                                    pathPattern:@"/events"
                                                                                        keyPath:@"events"
                                                                                    statusCodes:statusCodes
                                                                                                ];

    RKObjectMapping *requestMapping = [RKObjectMapping requestMapping]; // objectClass == NSMutableDictionary

    [requestMapping addAttributeMappingsFromDictionary:@{
     @"id": @"eventId",
     @"name": @"name",
     @"amount": @"amount",
     @"length": @"length",
     @"updated_at": @"updatedAt",
     @"created_at": @"createdAt",
     @"latitude": @"latitude",
     @"longitude": @"longitude",
     @"thumbnail": @"thumbnail",
     @"airTemp": @"airTemp",
     }];


    // For any object of class Article, serialize into an NSMutableDictionary using the given mapping and nest
    // under the 'article' key path
    RKRequestDescriptor *requestDescriptor = [RKRequestDescriptor requestDescriptorWithMapping:requestMapping
                                                                                   objectClass:[Event class]
                                                                                   rootKeyPath:@"events"
                                                                                                ];

    LocationsAppDelegate *appDelegate = (LocationsAppDelegate *)[[UIApplication sharedApplication] delegate];
//  RKObjectManager *manager = [RKObjectManager managerWithBaseURL:gBaseURL];


    [RKObjectManager sharedManager].requestSerializationMIMEType = RKMIMETypeJSON;
    [[RKObjectManager sharedManager] addRequestDescriptor:requestDescriptor];
    [[RKObjectManager sharedManager] addResponseDescriptor:eventDescriptor];

    NSLog(@"RVC-addEvent %@ - %@", appDelegate.user.login, appDelegate.user.password);
    [[NBEventManager sharedManager] setUsername:appDelegate.user.login andPassword:appDelegate.user.password];
    appDelegate.objectManager.HTTPClient = [NBEventManager sharedManager];


    event = [eventsArray objectAtIndex:0];
    [[RKObjectManager sharedManager] postObject:event
                                           path:@"/events"
                                     parameters:nil
                                        success:nil
                                        failure:nil
                                                ];

}

2013-01-15 23：25：52.857鱼[38803：13403]我 restkit.network:RKHTTPRequestOperation.m:152 POST ＆＃39; HTTP：//本地主机：3000 /事件＆＃39; 2013-01-15 23：25：52.969 fish [38803：16903]我restkit.network:RKHTTPRequestOperation.m:179 POST ＆＃39; HTTP：//本地主机：3000 /事件＆＃39; （201创建）[0.1121 s] 2013-01-15 23：25：52.971鱼[38803：17507] D. restkit.object_mapping：RKMapperOperation.m：360执行映射表示的操作：{ event = { airTemp =＆＃34;＆＃34 ;; 金额=＆＃34;＆＃34 ;; ＆＃34; created_at＆＃34; =＆＃34; 2013-01-16T04：25：52Z＆＃34 ;; id = 54; 纬度=＆＃34;＆＃34 ;; 长度=＆＃34;＆＃34 ;; 经度=＆＃34;＆＃34 ;; name =＆＃34;＆＃34 ;; thumbnail =＆＃34;＆＃34 ;; ＆＃34;的updated_at＆＃34; =＆＃34; 2013-01-16T04：25：52Z＆＃34 ;; ＆＃34; USER_ID＆＃34; =＆＃34;＆＃34 ;; };和targetObject :( entity：Event; id：0x9c7f710 ;数据： { airTemp = 0; 金额=零; createdAt =＆＃34; 2013-01-16 04:25:52 + 0000＆＃34 ;; eventId = 0; latitude =＆＃34; 28.158466＆＃34 ;; 长度= 0; 经度=＆＃34; -82.509215＆＃34 ;; name = nil; 照片=零; thumbnail =零; updatedAt = nil; }）2013-01-15 23：25：52.971 fish [38803：17507] D restkit.object_mapping：RKMapperOperation.m：287找到了可映射的数据 keyPath＆＃39; event＆＃39;：{ airTemp =＆＃34;＆＃34 ;; 金额=＆＃34;＆＃34 ;; ＆＃34; created_at＆＃34; =＆＃34; 2013-01-16T04：25：52Z＆＃34 ;; id = 54; 纬度=＆＃34;＆＃34 ;; 长度=＆＃34;＆＃34 ;; 经度=＆＃34;＆＃34 ;; name =＆＃34;＆＃34 ;; thumbnail =＆＃34;＆＃34 ;; ＆＃34;的updated_at＆＃34; =＆＃34; 2013-01-16T04：25：52Z＆＃34 ;; ＆＃34; USER_ID＆＃34; =＆＃34;＆＃34 ;; 2013-01-15 23：25：52.971 fish [38803：17507] D restkit.object_mapping：RKMapperOperation.m：232问地图来源对象{ airTemp =＆＃34;＆＃34 ;; 金额=＆＃34;＆＃34 ;; ＆＃34; created_at＆＃34; =＆＃34; 2013-01-16T04：25：52Z＆＃34 ;; id = 54; 纬度=＆＃34;＆＃34 ;; 长度=＆＃34;＆＃34 ;; 经度=＆＃34;＆＃34 ;; name =＆＃34;＆＃34 ;; thumbnail =＆＃34;＆＃34 ;; ＆＃34;的updated_at＆＃34; =＆＃34; 2013-01-16T04：25：52Z＆＃34 ;; ＆＃34; USER_ID＆＃34; =＆＃34;＆＃34 ;; }使用映射eventId＆gt;＆＃34;，＆＃34;名称＆gt;＆＃34 ;, ＆＃34;量GT;＆＃34 ;, ＆＃34;长度＆GT;＆＃34 ;, ＆＃34; updatedAt＆GT;＆＃34 ;, ＆＃34; createdAt＆GT;＆＃34 ;, ＆＃34;纬度和GT;＆＃34 ;, ＆＃34;经度＆GT;＆＃34 ;, ＆＃34; airTemp＆GT;＆＃34 ;, ＆＃34;缩略图＆GT;＆＃34; ）＆GT; 2013-01-15 23：25：52.971鱼[38803：17507] D. restkit.object_mapping：RKMappingOperation.m：754开始映射操作... 2013-01-15 23：25：52.972鱼[38803：17507] D. restkit.object_mapping：RKMappingOperation.m：818完成映射操作成功... 2013-01-15 23：25：52.973鱼[38803：17507] D. restkit.object_mapping：RKMapperOperation.m：316找到不可映射的值 at keyPath：events 2013-01-15 23：25：52.973 fish [38803：17507] D. restkit.object_mapping：RKMapperOperation.m：389完成表演对象映射。结果：{ event =＆＃34; （entity：Event; id：0x9c7f710 ;数据： {\ n airTemp = nil; \ n amount = nil; \ n createdAt = \＆＃34; 2013-01-16 04:25:52 +0000 \＆＃34;; \ n eventId = 54; \ n纬度= nil; \ n长度 = nil; \ n \ longitude = nil; \ n name = nil; \ n photo = nil; \ n thumbnail = nil; \ n updatedAt = \＆＃34; 2013-01-16 04:25:52 +0000 \＆＃34 ;; \ N}）＆＃34 ;; 2013-01-15 23：25：52.973鱼[38803：13403] D. restkit.core_data：RKManagedObjectRequestOperation.m：534跳过删除孤立对象：仅针对GET请求执行。 2013-01-15 23：25：52.976鱼[38803：11f03] D. restkit.core_data：RKManagedObjectRequestOperation.m：599刷新映射的目标对象（实体：事件; id： 0x9c7f710 ;数据： { airTemp = nil; 金额=零; createdAt =＆＃34; 2013-01-16 04:25:52 + 0000＆＃34 ;; eventId = 54; 纬度=零; 长度=零; 经度=零; name = nil; 照片=零; thumbnail =零; updatedAt =＆＃34; 2013-01-16 04:25:52 + 0000＆＃34 ;; }）在上下文中

现在这是我的代码，因为我已将所有映射移动到app delegate并实现了RKEntityMapping。我仍然没有附加到POST调用的JSON对象。

    RKEntityMapping *eventMapping = [RKEntityMapping mappingForEntityForName:@"Event" inManagedObjectStore:managedObjectStore];
[eventMapping addAttributeMappingsFromDictionary:@{
 @"id": @"eventId",
 @"name": @"name",
 @"amount": @"amount",
 @"length": @"length",
 @"updated_at": @"updatedAt",
 @"created_at": @"createdAt",
 @"latitude": @"latitude",
 @"longitude": @"longitude",
 @"thumbnail": @"thumbnail",
 @"airTemp": @"airTemp",
 }];
eventMapping.identificationAttributes = @[ @"eventId" ];

//RKRelationshipMapping *eventRelationship = [RKRelationshipMapping relationshipMappingFromKeyPath:@"events"
//                                                                                     toKeyPath:@"events"
//                                                                                   withMapping:eventMapping];
//[eventMapping addPropertyMapping:eventRelationship];

// Register our mappings with the provider
RKResponseDescriptor *responseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:eventMapping
                                                                                   pathPattern:nil
                                                                                       keyPath:@"event"
                                                                                   statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];
[objectManager addResponseDescriptor:responseDescriptor];

RKEntityMapping *eventRequestMapping = [eventMapping inverseMapping];
RKRequestDescriptor *eventRequestDescriptor = [RKRequestDescriptor requestDescriptorWithMapping:eventRequestMapping
                                                                                    objectClass:[Event class]
                                                                                    rootKeyPath:@"event"
                                                                                                ];
[objectManager addRequestDescriptor:eventRequestDescriptor];
[RKObjectManager sharedManager].requestSerializationMIMEType = RKMIMETypeJSON;

Answer 1

RESTKit 0.20pre6中存在一个错误，它将HTTP Body打印到NSLog，POST请求为（null），即使它是一个对象。我在开发分支中修复了它。 https://github.com/RestKit/RestKit/pull/1139

Answer 2

对于NSManagedObject映射，您应使用RKManagedObjectMapping或RKEntityMapping，具体取决于您使用的RestKit的版本，而不是RKObjectMapping。如果您使用的是最后一个，那么它应该是RKEntityMapping。

NSObject和NSManagedObject的指定初始化工具不相同，因此会产生空值。

您可以在他们的维基站点上阅读有关对象映射的更多信息：RestKit Object Mapping，尤其是核心数据部分。

Answer 3

在更好地理解了managedObjectContexts以及RestKit如何利用其中两个特别之后，我能够进入正确的上下文。使用createContexts创建了两个mainQueue和一个persistentStore Context。同样不是我需要在数据模型中选择我的事件实体并将类从NSManagedObject更改为Event和RestKit然后将该实体识别为类Event的实体。

使用RestKit进行POST后导致nil对象被发布

3 个答案: