4

我在使用 RestKit 0.20pre6 发布 NSManagedObject 时遇到问题，这会导致在我的 Rails 站点上创建一个具有 nil 值的条目。我怀疑映射器，但据我所知，我已经正确设置了我的 RK 对象。例子很少，支持也很有限。该示例处理 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，后面是控制台输出。该应用程序可以很好地从服务器获取对象。

        // 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 'http://localhost:3000/events' 2013-01-15 23:25:52.969 鱼[ 38803:16903] 我 restkit.network:RKHTTPRequestOperation.m:179 POST 'http://localhost:3000/events' (201 Created) [0.1121 s] 2013-01-15 23:25:52.971 fish[38803:17507] D restkit.object_mapping:RKMapperOperation.m:360 为表示执行映射操作：{ event = { airTemp = ""; 金额 = ""; "created_at" = "2013-01-16T04:25:52Z"; ID = 54; 纬度 = ""; 长度 = ""; 经度 = ""; 名称 = ""; 缩略图 = ""; "updated_at" = "2013-01-16T04:25:52Z"; “用户ID”=“”；}; } 和目标对象：（实体：事件；id：0x9c7f710；数据：{ airTemp = 0；数量 = nil；createdAt =“2013-01-16 04:25:52 +0000”；eventId = 0；纬度 =“28.158466” ；长度 = 0；经度 =“-82.509215”；名称 = 无；照片 = 无；缩略图 = 无；更新时间 = 无；}) 2013-01-15 23:25:52.971 鱼[38803:17507] D restkit.object_mapping :RKMapperOperation.m:287 在 keyPath 'event' 找到可映射的数据：{ airTemp = ""; 金额 = ""; "created_at" = "2013-01-16T04:25:52Z"; ID = 54; 纬度 = ""; 长度 = ""; 经度 = ""; 名称 = ""; 缩略图 = ""; "updated_at" = "2013-01-16T04:25:52Z"; “用户ID”=“”；} 2013-01-15 23:25:52.971 fish[38803:17507] D restkit.object_mapping:RKMapperOperation.m:232 要求映射源对象 { airTemp = ""; 金额 = ""; "created_at" = "2013-01-16T04:25:52Z"; ID = 54; 纬度 = ""; 长度 = ""; 经度 = ""; 名称 = ""; 缩略图 = ""; "updated_at" = "2013-01-16T04:25:52Z"; “用户ID”=“”；} 使用映射 eventId>"、"name>"、"amount>"、"length>"、"updatedAt>"、"createdAt>"、"latitude>"、“经度>”、“airTemp>”、“缩略图>”)> 2013-01-15 23:25:52.971 fish[38803:17507] D restkit.object_mapping:RKMappingOperation.m:754 开始映射操作... 2013- 01-15 23:25:52.972 fish[38803:17507] D restkit.object_mapping:RKMappingOperation.m:818 成功完成映射操作... 2013-01-15 23:25:52.973 fish[38803:17507] D restkit. object_mapping:RKMapperOperation.m:316 在 keyPath 找到不可映射的值：事件 2013-01-15 23:25:52.973 fish[38803:17507] D restkit.object_mapping:RKMapperOperation.m:389 完成执行对象映射。结果：{ event = " (entity: Event; id: 0x9c7f710 ; data: {\n airTemp = nil;\n amount = nil;\n createdAt = \"2013-01-16 04:25:52 +0000\" ;\n eventId = 54;\n 纬度 = nil; 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 fish[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；数量 = nil； createdAt = "2013-01-16 04:25:52 +0000"; eventId = 54; latitude = nil; length = nil; longitude = nil; name = nil; photo = nil; thumbnail = nil; updatedAt = "2013- 01-16 04:25:52 +0000"; }) 在上下文中 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 fish[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；数量 = nil； createdAt = "2013-01-16 04:25:52 +0000"; eventId = 54; latitude = nil; length = nil; longitude = nil; name = nil; photo = nil; thumbnail = nil; updatedAt = "2013- 01-16 04:25:52 +0000"; }) 在上下文中

这是我的代码，因为我已将所有映射移至应用程序委托并实现了 RKEntityMapping。我仍然没有收到附加到 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;
4

3 回答 3

5

RESTKit 0.20pre6 中有一个错误，它将 HTTP 正文打印到 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

于 2013-01-21T17:23:45.910 回答
2

对于NSManagedObject映射，您应该使用RKManagedObjectMapping或RKEntityMapping，这取决于您使用的 RestKit 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和的指定初始化NSManagedObject器不相同，从而导致空值。

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

于 2013-01-20T16:06:03.100 回答
1

在更好地了解 managedObjectContexts 以及 RestKit 如何特别利用其中两个之后，我能够进入正确的上下文。有两个用 createContexts 创建一个 mainQueue 和一个 persistentStore 上下文。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，然后 RestKit 将实体识别为类 Event 的实体。

于 2013-02-05T16:44:22.013 回答