Question

我已经获得了返回以下数据的API

{
    "id": "45832",
    "name": "test name",
    "parentId":"xyz",
    //other fields
}

我可以使用restkit保存这些数据。我有另一个API来获取只返回更新字段的更改。例如

{
    "id": "45832",
    "name": "test name2",
    //other updated fields
}

我希望这些数据更新db中的现有对象。但在我的情况下，它将parentId和其他缺少的属性设置为null。我在实体映射中设置了标识属性。

编辑：

以下是具有实体映射的托管对象的类。 #import＆＃34; ZEntity.h＆＃34; #import＆＃34; ZContent.h＆＃34; #import＆＃34; ZThumb.h＆＃34;

@implementation ZEntity

@dynamic availableFrom;
@dynamic dueDate;
@dynamic entityId;
@dynamic name;
@dynamic perCompleted;
@dynamic state;
@dynamic type;
@dynamic thumb;
@dynamic contents;
@dynamic completedOn;
@dynamic totalScore;
@dynamic parent;
@dynamic settings;

+ (RKEntityMapping *)map{
    RKEntityMapping *mapping = [RKEntityMapping mappingForEntityForName:NSStringFromClass([self class]) inManagedObjectStore:[RKManagedObjectStore defaultStore]];
    mapping.persistentStore = [RKManagedObjectStore defaultStore].persistentStoreCoordinator.persistentStores.firstObject;

    NSAssert(mapping.persistentStore != nil, @"Requires Persistent Store");

    mapping.identificationAttributes = @[@"entityId"];
    [mapping addAttributeMappingsFromDictionary:@{
                                              @"id" : @"entityId",
                                              @"type" : @"type",
                                              @"name" : @"name",
                                              @"dueDate" : @"dueDate",
                                              @"state" : @"state",
                                              @"availableFrom" :@"availableFrom",
                                              @"percCompletion" : @"perCompleted",
                                              @"completedOn" : @"completedOn",
                                              @"totalScore" : @"totalScore"
                                              }];
    [mapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"thumb" toKeyPath:@"thumb" withMapping:[ZThumb map]]];
    return mapping;
}

@end

响应描述符

RKResponseDescriptor* entitiesD = [RKResponseDescriptor responseDescriptorWithMapping:[ZEntity map] 
    method:RKRequestMethodAny pathPattern:nil keyPath:@"objects" 
    statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];

Json回应

{
"total": 9,
"start": 1,
"count": 10,
"objects": [{
    "id": "636488166759829858",
    "type": "UPDATE",
    "name": "copy1",
    "canReattempt": false,
    "score": 0,
    "totalScore": 300,
    "thumb": {
        "id": "THUMB_QUPDATE4",
        "expiry": 1472545125,
        "url_180_120": "//s3-ap-southeast-1.amazonaws.com/mtgame-cdn.mindtickle.com/allaboard4.0/thumb/Q-Update-Thumbnail_04.png?AWSAccessKeyId=AKIAJYDLQOOEIA6NZLPQ&Expires=1472545125&Signature=To8a5SN7CoCiWDmmtXLkyANKulw%3D"
    },
    "dueDate": 1440845008,
    "dueDateObj": {
        "dueOn": 1440845008,
        "dueDateExpiryAction": "NONE"
    },
    "state": "ACTIVE",
    "percCompletion": 0.0,
    "availableFrom": 1440585808,
    "completedOn": 0,
    "startTime": null,
    "expiryTime": null,
    "certificateCutOffScore": -1,
    "lastPublishTime": 1440585653,
    "completionCertificateEnabled": null
}]
}

在之前的调用中，我为parent类设置了Entity字段，这是一种关系（我也通过sqlite浏览器对此进行了验证）。在这个json中没有父母返回。完成此调用后，parent将设置为null。我必须保留现有的父值。

如何使用restkit中的部分数据更新现有对象？

0 个答案: