Ios RestKit postObject方法中的post对象与它返回的RKMappingResult之间的关系是什么？

我已经阅读了RestKit上的文档，但还没有找到

RKMappingResult

上的一些细节

我的代码创建了一个名为

newUser

的

NSManagedObject

，并在RestKit-RKManagedObjectStore的

mainQueueManagedObjectContext

中插入。然后，我使用对象管理器的

postObject:path:parameters:success:failure:

方法将用户发布到服务器。这似乎效果不错

当post请求完成时，我需要更新

newUser

托管对象上的一些字段，这些字段不会从post请求的结果映射。传递到块中的

mappingResult

参数似乎具有托管对象，该对象与服务器响应中设置的所有字段正确映射

显然，

mappingResult

中的对象与我发布的对象不同，因为它们不在同一个线程中。如果在发布前保存

newUser

，当请求完成并返回映射结果时，它们的

objectID

是否相同

我想象

newUser

和映射结果中的对象都指向存储在CoreData中的同一个对象，对吗？我问的原因是，情况似乎并非如此。如果我发出一个post请求并保存

newUser

对象和

mappingResult

中返回的对象，那么我在核心数据中会得到两个不同的对象，一个用于

newUser

，另一个用于映射结果。我通过更改mappingResult对象和

newUser

对象上的一个字段来确认这一点，并看到它们都是独立更改的。此外，在下一次提取时提取两个用户对象。我如何防止这种情况

但是，如果这是正确的，如果请求尚未完成，我崩溃会发生什么？我不会在CoreData中有一个存根对象吗

如果请求失败，如何删除我创建的存根对象？在故障块中，我可以执行以下操作吗

        dispatch_async(dispatch_get_main_queue(), ^{
            [newUser.managedObjectContext deleteObject:newRegisteredUser];
        });

其中，

newUser

，是我在mainQueue上创建的托管对象

最后，如果我通过映射结果返回后台线程中的托管对象，我不能将returnedUser设置为UI用于获取信息的用户，因为该用户位于主线程上，那么如何通知UI更改其用户？我是否应该发布通知，告知UI从核心数据中重新提取活动用户

关于重复对象的更新

我已经做了一些进一步的测试，当post返回时，我肯定会得到一个重复的对象

我首先创建一个

newUser

，并在其上设置属性：

HNGRRegisteredUser *newUser = [NSEntityDescription insertNewObjectForEntityForName:@"RegisteredUser" inManagedObjectContext:context];
newUser.firstName = @"John"
newUser.lastName = @"Smith"
newUser.gender = @"Male"
newUser.email = @"js@email.com"
newUser.hungrosityModel = //fill in all of the attributes for a hungrosityModel, except uniqueID

此时，newUser.uniqueID==nil。然后保存newUser（我假设必须这样做，RestKit才能使用永久objectID）以生成存根对象

NSError *saveError;
[newRegisteredUser.managedObjectContext saveToPersistentStore:&saveError];
if (saveError) NSLog(@"Save Error: %@", saveError);
NSLog(@"newUser objectID: %@", [newRegisteredUser.objectID URIRepresentation]);

然后我发布

newUser

对象

[[RKObjectManager sharedManager] postObject:newRegisteredUser path:@"users/" parameters:nil success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
    NSError *saveError;
    HNGRRegisteredUser *returnedUser = [mappingResult firstObject];
    NSLog(@"mappingResult objectID: %@", [returnedUser.objectID URIRepresentation]);

    [returnedUser.managedObjectContext saveToPersistentStore:&saveError];
    if (saveError) NSLog(@"Error saving user upon registration: %@", saveError);
} failure:^(RKObjectRequestOperation *operation, NSError *error) {
    [newUser.managedObjectContext deleteObject:newUser];
}];

ObjectId的打印输出如下所示

newUser objectID: x-coredata://B74AB613-1060-4D98-ABFC-3B4D89AB12C3/RegisteredUser/p2
mappingResult objectID: x-coredata://B74AB613-1060-4D98-ABFC-3B4D89AB12C3/RegisteredUser/p3

发送到服务器的JSON为：

{
    "gender":"Male",
    "lastName":"Smith",
    "firstName":"John",
    "email":"js@email.com",
    "hungrosityModel": {
        "totalNumberOfUpdates":0,
        "peakHungrosity":0.8,
        "hungrosityFractionAtLastUpdate":0,
        "rateOfHungrosification":5e-05,
        "troughHungrosity":0.1,
        "peakUpdates":0
    }
}

{"results": [
    {"receivedFriendRequests": [],
     "firstName": "John",
     "middleName": null,
     "hungrosityModel": {"uniqueID": 13},
     "email": "js@email.com",
     "gender": "Male",
     "lastName": "Smith",
     "sentFriendRequests": [],
     "uniqueID": 14,
     "updatedAt": "2014-03-12T17:45:01.973Z",
     "friends": [],
     "profileImageUpdatedAt": null,
     "createdAt": "2014-03-12T17:45:01.809Z"}
 ]}

从服务器返回的JSON为：

{
    "gender":"Male",
    "lastName":"Smith",
    "firstName":"John",
    "email":"js@email.com",
    "hungrosityModel": {
        "totalNumberOfUpdates":0,
        "peakHungrosity":0.8,
        "hungrosityFractionAtLastUpdate":0,
        "rateOfHungrosification":5e-05,
        "troughHungrosity":0.1,
        "peakUpdates":0
    }
}

{"results": [
    {"receivedFriendRequests": [],
     "firstName": "John",
     "middleName": null,
     "hungrosityModel": {"uniqueID": 13},
     "email": "js@email.com",
     "gender": "Male",
     "lastName": "Smith",
     "sentFriendRequests": [],
     "uniqueID": 14,
     "updatedAt": "2014-03-12T17:45:01.973Z",
     "friends": [],
     "profileImageUpdatedAt": null,
     "createdAt": "2014-03-12T17:45:01.809Z"}
 ]}

对象的响应和请求描述符为：

[[RKObjectManager sharedManager].router.routeSet addRoute:[RKRoute routeWithClass:[HNGRRegisteredUser class] pathPattern:@"users/" method:RKRequestMethodPOST]];

RKResponseDescriptor *registrationResponseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:[HNGRRKMappingProvider registeredUserMapping] method:RKRequestMethodPOST pathPattern:@"users/" keyPath:@"results" statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];
[[RKObjectManager sharedManager] addResponseDescriptor: registrationResponseDescriptor];

RKRequestDescriptor *registrationRequestDescriptor = [RKRequestDescriptor requestDescriptorWithMapping:[[HNGRRKMappingProvider registeredUserMapping] inverseMapping] objectClass:[HNGRRegisteredUser class] rootKeyPath:nil method:RKRequestMethodPOST];
[[RKObjectManager sharedManager] addRequestDescriptor:registrationRequestDescriptor];

用户的映射为：

RKEntityMapping *_mapping = nil;
_mapping = [RKEntityMapping mappingForEntityForName:@"RegisteredUser" inManagedObjectStore:[RKManagedObjectStore defaultStore]];
[_mapping addAttributeMappingsFromArray:@[@"uniqueID",
                                           @"createdAt",
                                           @"updatedAt",
                                           @"firstName",
                                           @"middleName",
                                           @"lastName",
                                           @"email",
                                           @"gender",
                                           @"profileImageUpdatedAt"]];
[_mapping addRelationshipMappingWithSourceKeyPath:@"hungrosityModel" mapping:[HNGRRKMappingProvider basicModelMapping]];
_mapping.identificationAttributes = @[@"uniqueID"];

以下是相关的对象映射跟踪：

D restkit.object_mapping:RKMapperOperation.m:377 Executing mapping operation for representation: {
        results =     (
                    {
                createdAt = "2014-03-12T18:22:35.688Z";
                dateOfBirth = "2014-03-12T18:24:02Z";
                firstName = John;
                friends =             (
                );
                gender = Male;
                hungrosityModel =             {
                    uniqueID = 14;
                };
                lastName = Smith;
                middleName = "<null>";
                profileImageUpdatedAt = "<null>";
                receivedFriendRequests =             (
                );
                sentFriendRequests =             (
                );
                uniqueID = 14;
                updatedAt = "2014-03-12T18:22:35.856Z";
            }
        );
    }
     and targetObject: <HNGRRegisteredUser: 0xaa8c180> (entity: RegisteredUser; id: 0xa894550 <x-coredata://44B8DF7A-BDC9-45F2-A137-BFAACF4AAF88/RegisteredUser/p2> ; data: {
        createdAt = nil;
        dateOfBirth = "2014-03-12 18:24:02 +0000";
        email = "js@email.com";
        firstName = John;
        friendRequests = "<relationship fault: 0xa899dd0 'friendRequests'>";
        friends = "<relationship fault: 0xa891ea0 'friends'>";
        gender = Male;
        hungrosityModel = "0xa861980 <x-coredata://44B8DF7A-BDC9-45F2-A137-BFAACF4AAF88/BasicModel/p2>";
        hungrosityUpdateEvents = "<relationship fault: 0xa829d90 'hungrosityUpdateEvents'>";
        isLocalUser = 0;
        lastName = Smith;
        middleName = nil;
        myInvitations = nil;
        profileImageData = nil;
        profileImageThumbnailData = nil;
        profileImageUpdatedAt = nil;
        receivedInvitations = nil;
        registeredUserSettings = nil;
        savedHungrosityComments = "<relationship fault: 0xa8bc450 'savedHungrosityComments'>";
        uniqueID = nil;
        updatedAt = nil;
        user = nil;
        userSettings = nil;
    })
  T restkit.object_mapping:RKMapperOperation.m:320 Examining keyPath 'results' for mappable content...
  D restkit.object_mapping:RKMapperOperation.m:297 Found mappable collection at keyPath 'results': (
            {
            createdAt = "2014-03-12T18:22:35.688Z";
            dateOfBirth = "2014-03-12T18:24:02Z";
            firstName = John;
            friends =         (
            );
            gender = Male;
            hungrosityModel =         {
                uniqueID = 14;
            };
            lastName = Smith;
            middleName = "<null>";
            profileImageUpdatedAt = "<null>";
            receivedFriendRequests =         (
            );
            sentFriendRequests =         (
            );
            uniqueID = 14;
            updatedAt = "2014-03-12T18:22:35.856Z";
        }
    )

 D restkit.object_mapping:RKMappingOperation.m:952 Starting mapping operation...
 T restkit.object_mapping:RKMappingOperation.m:953 Performing mapping operation: <RKMappingOperation 0xa8e4440> for 'HNGRRegisteredUser' object. Mapping values from object {
    createdAt = "2014-03-12T18:22:35.688Z";
    dateOfBirth = "2014-03-12T18:24:02Z";
    firstName = John;
    friends =     (
    );
    gender = Male;
    hungrosityModel =     {
        uniqueID = 14;
    };
    lastName = Smith;
    middleName = "<null>";
    profileImageUpdatedAt = "<null>";
    receivedFriendRequests =     (
    );
    sentFriendRequests =     (
    );
    uniqueID = 14;
    updatedAt = "2014-03-12T18:22:35.856Z";
} to object <HNGRRegisteredUser: 0xa8833b0> (entity: RegisteredUser; id: 0xa8777e0 <x-coredata:///RegisteredUser/t1FD3D8DE-75AD-4194-B157-EB6931B74BDB6> ; data: {
    createdAt = nil;
    dateOfBirth = nil;
    email = nil;
    firstName = nil;
    friendRequests =     (
    );
    friends =     (
    );
    gender = nil;
    hungrosityModel = nil;
    hungrosityUpdateEvents =     (
    );
    isLocalUser = 0;
    lastName = nil;
    middleName = nil;
    myInvitations = nil;
    profileImageData = nil;
    profileImageThumbnailData = nil;
    profileImageUpdatedAt = nil;
    receivedInvitations = nil;
    registeredUserSettings = nil;
    savedHungrosityComments =     (
    );
    uniqueID = 14;
    updatedAt = nil;
    user = nil;
    userSettings = nil;
}) with object mapping (null)

D restkit.object_映射：RKMapperOperation.m:377执行表示的映射操作：{
结果=(
{
createdAt=“2014-03-12T18:22:35.688Z”；
出生日期=“2014-03-12T18:24:02Z”；
名字=约翰；
朋友=(
);
性别=男性；
hungrosityModel={
uniqueID=14；
};
姓氏=史密斯；
middleName=“”；
profileImageUpdatedAt=“”；
已接收的朋友请求=(
);
sentFriendRequests=(
);
uniqueID=14；
updatedAt=“2014-03-12T18:22:35.856Z”；
}
);
}
和targetObject:（实体：RegisteredUser；id:0xa894550；数据：{
createdAt=nil；
出生日期=“2014-03-12 18:24:02+0000”；
电子邮件=”js@email.com";
名字=约翰；
friendRequests=“”；
“朋友”；
性别=男性；
hungrosityModel=“0xa861980”；
hungrosityUpdateEvents=“”；
isLocalUser=0；
姓氏=史密斯；
middleName=nil；
我的邀请=零；
profileImageData=nil；
profileImageThumbnailData=nil；
profileImageUpdatedAt=nil；
ReceivedVitations=零；
registeredUserSettings=nil；
savedHungrosityComments=“”；
uniqueID=nil；
updatedAt=nil；
用户=零；
userSettings=nil；
})
对象映射：RKMapperOperation.m:320正在检查可映射内容的键路径“结果”。。。
D restkit.object_mapping:rkmapperooperation.m:297在键路径“results”处找到可映射集合：(
{
createdAt=“2014-03-12T18:22:35.688Z”；
出生日期=“2014-03-12T18:24:02Z”；
名字=约翰；
朋友=(
);
性别=男性；
hungrosityModel={
uniqueID=14；
};
姓氏=史密斯；
middleName=“”；
profileImageUpdatedAt=“”；
已接收的朋友请求=(
);
sentFriendRequests=(
);
uniqueID=14；
updatedAt=“2014-03-12T18:22:35.856Z”；
}
)
D restkit。