RestKit發佈嵌套託管對象創建重複

Question

我有一些困難發佈NSManagedObject嵌套NSManagedObjects與RestKit。當POST返回時，我似乎獲取插入到CoreData中的sub-NSManagedObjects的重複記錄。下面是模型的快照：

這裏是我張貼的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 
} 

這裏是從服務的POST後返回的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 
} 

編輯（我想這很重要）：這裏是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]]; 

以下代碼是在哪裏創建的NSManagedObjects並調用[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]; 
    }]; 

當調用成功塊，我檢查SQLite數據庫和有1 WTSRecord插入和 WTSImages。其中一個WTSImages對WTSRecord和數據庫中的PK具有正確的FK，而另一個似乎是孤立的（dbId和FK到WTSRecord未設置）。

這裏是到RestKit和核心數據跟蹤日誌的鏈接：https://dl.dropboxusercontent.com/u/466390/restkit2.txt

希望有人能幫助！謝謝！

編輯後一些更多的搜索，我找到了這個網頁：https://github.com/RestKit/RestKit/issues/1228

我必須張貼到一個REST服務之前創建使用UUID客戶端識別元素？ RestKit無法將請求對象映射回已經在對象存儲中創建的對象，而無需先在客戶端設置標識屬性？

Answer 1

對於發佈的對象，RestKit瞭解如何使用響應數據更新該項目，但不適用於關係內容。從技術上講，它可以被編碼，但它目前不是。

如果您需要映射後關係中的對象與您創建的對象相同，那麼您有問題。如果你不介意它是一個不同的對象，則問題只是刪除重複...

重複刪除：

獲取請求塊處理POST響應所以你最好不使用時，需要獲取並手動刪除它。我將假設任何與記錄無關的圖像都是一個愚蠢的行爲，因此這是一個相對簡單的執行獲取。