RestKit发布嵌套托管对象创建重复

Question

我有一些困难发布NSManagedObject嵌套NSManagedObjects与RestKit。当POST返回时，我似乎获取插入到CoreData中的sub-NSManagedObjects的重复记录。下面是模型的快照：

这里是我张贴的JSON：

{ 
    "actions": [], 
    "application": "Identify", 
    "createBy": "welcomed", 
    "createDt": "2014-04-11T16:26:15Z", 
    "description": null, 
    "externalId": null, 
    "groupId": "5", 
    "id": 0, 
    "images": [ 
    { 
     "format": "JPEG", 
     "height": 200, 
     "id": 0, 
     "image": "/9j/4A..../Pv5n/9k=", 
     "status": "C", 
     "type": "MUGSHOT", 
     "width": 200 
    } 
    ], 
    "locked": null, 
    "modifyBy": null, 
    "modifyDt": null, 
    "priv": null 
} 

这里是从服务的POST后返回的JSON：

{ 
"actions": [], 
    "application": "Identify", 
    "createBy": "welcomed", 
    "createDt": 1397233575000, 
    "description": null, 
    "externalId": null, 
    "groupId": "5", 
    "id": 11, 
    "images": [ 
    { 
     "captureDevice": null, 
     "createBy": null, 
     "createDt": null, 
     "format": "JPEG", 
     "height": 200, 
     "id": 11, 
     "image": "/9j/4AAQSkZJR.../Pv5n/9k=", 
     "recordId": 11, 
     "status": "C", 
     "type": "MUGSHOT", 
     "width": 200 
    } 
    ], 
    "locked": false, 
    "modifyBy": null, 
    "modifyDt": null, 
    "priv": false 
} 

编辑（我想这很重要）：这里是WTSImage和WTSRecord的映射：

RKEntityMapping *recordMapping = [RKEntityMapping mappingForEntityForName:@"WTSRecord" inManagedObjectStore:self.managedObjectStore]; 
    [recordMapping addAttributeMappingsFromDictionary:@{ 
                 @"id":@"dbId", 
                 @"externalId":@"extId", 
                 @"groupId":@"groupId", 
                 @"application": @"application", 
                 @"description": @"desc", 
                 @"priv": @"priv", 
                 @"locked": @"locked", 
                 @"createBy": @"createBy", 
                 @"createDt": @"createDt", 
                 @"modifyBy": @"modifyBy", 
                 @"modifyDt": @"modifyDt", 
                 }]; 
    recordMapping.identificationAttributes = @[@"dbId"]; 

    //image mapping 
    RKEntityMapping *imageMapping = [RKEntityMapping mappingForEntityForName:@"WTSImage" inManagedObjectStore:self.managedObjectStore]; 
    [imageMapping addAttributeMappingsFromDictionary:@{ 
                 @"id": @"dbId", 
                 @"status": @"status", 
                 @"type": @"type", 
                 @"format": @"format", 
                 @"width": @"width", 
                 @"height": @"height", 
                 @"image": @"base64Image" 
                 }]; 

    imageMapping.identificationAttributes = @[@"dbId"]; 
    [recordMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"images" toKeyPath:@"images" withMapping:imageMapping]]; 

以下代码是在哪里创建的NSManagedObjects并调用[RKObjectManager postObject:path:parameters:success:failure:：

WTSRecord *record = [NSEntityDescription insertNewObjectForEntityForName:@"WTSRecord" inManagedObjectContext:self.managedObjectContext]; 
record.createBy = @"welcomed"; 
record.createDt = [NSDate date]; 
record.application = kWTSApplicationIdentify; 
record.groupId = @"5"; 

WTSImage *image = [NSEntityDescription insertNewObjectForEntityForName:@"WTSImage" inManagedObjectContext:self.managedObjectContext]; 
image.height = [NSNumber numberWithFloat:mugshot.size.height]; 
image.width = [NSNumber numberWithFloat:mugshot.size.width]; 
image.imageData = UIImageJPEGRepresentation(imageData, 1.0); 
image.type = kWTSCaptureTypeMugshot; 
image.format = kWTSCaptureFormatJpeg; 
image.status = kWTSCaptureStatusCaptured; 

image.record = record; 
[record addImagesObject:image]; 

RKObjectManager *manager = [RKObjectManager sharedManager]; 
[manager postObject:record path:@"records" parameters:nil success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) { 

    } failure:^(RKObjectRequestOperation *operation, NSError *error) { 
     UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error Sending Record" message:error.localizedDescription delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil]; 
     [alert show]; 
    }]; 

当调用成功块，我检查SQLite数据库和有1 WTSRecord插入和 WTSImages。其中一个WTSImages对WTSRecord和数据库中的PK具有正确的FK，而另一个似乎是孤立的（dbId和FK到WTSRecord未设置）。

这里是到RestKit和核心数据跟踪日志的链接：https://dl.dropboxusercontent.com/u/466390/restkit2.txt

希望有人能帮助！谢谢！

编辑后一些更多的搜索，我找到了这个网页：https://github.com/RestKit/RestKit/issues/1228

我必须张贴到一个REST服务之前创建使用UUID客户端识别元素？ RestKit无法将请求对象映射回已经在对象存储中创建的对象，而无需先在客户端设置标识属性？

Answer 1

对于发布的对象，RestKit了解如何使用响应数据更新该项目，但不适用于关系内容。从技术上讲，它可以被编码，但它目前不是。

如果您需要映射后关系中的对象与您创建的对象相同，那么您有问题。如果你不介意它是一个不同的对象，则问题只是删除重复...

重复删除：

获取请求块处理POST响应所以你最好不使用时，需要获取并手动删除它。我将假设任何与记录无关的图像都是一个愚蠢的行为，因此这是一个相对简单的执行获取。