RestKit 模型对象引发 -valueForUndefinedKey: 用于合成属性
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【中文标题】RestKit 模型对象引发 -valueForUndefinedKey: 用于合成属性【英文标题】：RestKit model object raises -valueForUndefinedKey: for a synthesized property 【发布时间】：2013-03-13 20:40:55 【问题描述】：我正在尝试映射到一个对象，但一直在获取
[<ItemObject 0x100353710> valueForUndefinedKey:]: this class is not key value coding-compliant for the key uid.
ItemObject.h
@interface ItemObject : NSObject
@property (nonatomic, retain) NSNumber * uid;
@property (nonatomic, retain) NSString * title;
@property (nonatomic, retain) NSString * itemType;
@end
ItemObject.m
@implementation ItemObject
@dynamic uid;
@dynamic title;
@dynamic itemType;
@end
方法
+ (void)searchFeatureById:(NSString *)searchId
NSLog(@"Search Feature By ID: %@", searchId);
RKObjectMapping *itemMapping = [RKObjectMapping mappingForClass:[ItemObject class]];
[itemMapping addAttributeMappingsFromDictionary:@
@"id": @"uid",
@"name": @"title",
@"item_type": @"itemType"
];
RKResponseDescriptor *responseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:itemMapping pathPattern:nil keyPath:@"data" statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];
RKObjectMapping *errorMapping = [RKObjectMapping mappingForClass:[RKErrorMessage class]];
// The entire value at the source key path containing the errors maps to the message
[errorMapping addPropertyMapping:[RKAttributeMapping attributeMappingFromKeyPath:nil toKeyPath:@"errorMessage"]];
NSIndexSet *statusCodes = RKStatusCodeIndexSetForClass(RKStatusCodeClassClientError);
// Any response in the 4xx status code range with an "errors" key path uses this mapping
RKResponseDescriptor *errorDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:errorMapping pathPattern:nil keyPath:@"error_description" statusCodes:statusCodes];
RKObjectManager *manager = [RKObjectManager sharedManager];
NSLog(@"HTTP Client: %@", manager.HTTPClient);
[manager addResponseDescriptorsFromArray:@[ responseDescriptor, errorDescriptor ]];
// NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSDictionary *params = [NSDictionary dictionaryWithObjectsAndKeys:
@"false", @"with_lock"
, nil];
NSString *path = [NSString stringWithFormat:@"/api/v1/features/%@", searchId];
NSLog(@"Manager: %@", manager);
[manager getObjectsAtPath:path parameters:params success:^(RKObjectRequestOperation *operation, RKMappingResult *result)
NSLog(@"Results: %@", result);
// Handled with articleDescriptor
failure:^(RKObjectRequestOperation *operation, NSError *error)
// Transport error or server error handled by errorDescriptor
NSLog(@"Error: %@", [error localizedDescription]);
NSAlert *alert = [NSAlert alertWithMessageText:@"Error" defaultButton:@"OK" alternateButton:nil otherButton:nil informativeTextWithFormat:@"%@", [error localizedDescription]];
[alert runModal];
];
JSON 响应
"data":
"id": 1961,
"item_type": "features",
"assigned_to":
"id": 106
,
"parent":
"id": 0
,
"priority":
"id": 3
,
"project":
"id": 62
,
"release":
"id": 180
,
"reported_by":
"id": 106
,
"reported_by_customer_contact":
"id": 0
,
"status":
"id": 6
,
"workflow_step":
"id": 10
,
"actual_duration":
"duration": 0,
"time_unit":
"id": 2
,
"estimated_duration":
"duration": 8,
"time_unit":
"id": 2
,
"remaining_duration":
"duration": 0,
"time_unit":
"id": 2
,
"percent_complete": 0,
"archived": false,
"publicly_viewable": false,
"completion_date": "1899-01-01T07:00:00Z",
"due_date": "1899-01-01T07:00:00Z",
"start_date": "2013-03-11T07:00:00Z",
"description": "Create Login GUI",
"name": "Login View",
"notes": "",
"number": "1961",
"build_number": "",
"custom_fields":
"custom_157": true,
"custom_180": "",
"custom_174": "",
"custom_181": false,
"custom_179": "",
"custom_182": "",
"custom_186": false,
"custom_156": 0,
"custom_161": "",
"custom_163": "",
"custom_164": "",
"custom_165": "",
"custom_167": "",
"custom_185": []
崩溃
(
0 CoreFoundation 0x00007fff8d39bf56 __exceptionPreprocess + 198
1 libobjc.A.dylib 0x00007fff8a7b2d5e objc_exception_throw + 43
2 CoreFoundation 0x00007fff8d4261b9 -[NSException raise] + 9
3 Foundation 0x00007fff9716c703 -[NSObject(NSKeyValueCoding) valueForUndefinedKey:] + 240
4 Foundation 0x00007fff970a338e _NSGetUsingKeyValueGetter + 108
5 Foundation 0x00007fff970a3315 -[NSObject(NSKeyValueCoding) valueForKey:] + 392
6 Foundation 0x00007fff970c2da2 -[NSObject(NSKeyValueCoding) valueForKeyPath:] + 348
7 RestKit 0x0000000100079675 -[RKMappingOperation shouldSetValue:atKeyPath:] + 85
8 RestKit 0x000000010007ad9f -[RKMappingOperation applyAttributeMapping:withValue:] + 2079
9 RestKit 0x000000010007c028 -[RKMappingOperation applyAttributeMappings:] + 1752
10 RestKit 0x00000001000832e0 -[RKMappingOperation main] + 3200
11 Foundation 0x00007fff970c56b4 -[__NSOperationInternal start] + 705
12 RestKit 0x000000010006c84e -[RKMapperOperation mapRepresentation:toObject:atKeyPath:usingMapping:metadata:] + 1870
13 RestKit 0x000000010006afbb -[RKMapperOperation mapRepresentation:atKeyPath:usingMapping:] + 1883
14 RestKit 0x000000010006da20 -[RKMapperOperation mapRepresentationOrRepresentations:atKeyPath:usingMapping:] + 832
15 RestKit 0x000000010006e26e -[RKMapperOperation mapSourceRepresentationWithMappingsDictionary:] + 1966
16 RestKit 0x000000010006ebbf -[RKMapperOperation main] + 1375
17 Foundation 0x00007fff970c56b4 -[__NSOperationInternal start] + 705
18 RestKit 0x00000001000e8f1c -[RKObjectResponseMapperOperation performMappingWithObject:error:] + 1116
19 RestKit 0x00000001000e7347 -[RKResponseMapperOperation main] + 2055
20 Foundation 0x00007fff970c56b4 -[__NSOperationInternal start] + 705
21 Foundation 0x00007fff970d8912 ____NSOQSchedule_block_invoke_2 + 124
22 libdispatch.dylib 0x00007fff8abe1a82 _dispatch_call_block_and_release + 18
23 libdispatch.dylib 0x00007fff8abe2961 _dispatch_worker_thread2 + 255
24 libsystem_c.dylib 0x00007fff9054c3da _pthread_wqthread + 316
25 libsystem_c.dylib 0x00007fff9054db85 start_wqthread + 13
使用 RestKit 0.20.0-rc1 进行 Mac OS X 开发
我做错了什么？如果我添加/删除对象属性，它会为新参数引发相同的键/值错误。这让我相信这不是我的对象的东西，而是关键路径？
更新
它跳转到RKMappingOperation.m文件的第356行。
- (BOOL)shouldSetValue:(id *)value atKeyPath:(NSString *)keyPath
id currentValue = [self.destinationObject valueForKeyPath:keyPath]; //<-- this line here
if (currentValue == [NSNull null])
currentValue = nil;
@noa 更新 2
2013-03-14 10:11:51.012 Project[55798:6a03] Destination Class: ItemObject
2013-03-14 10:11:51.012 Project[55798:6a03] Destination Class Super: NSObject
添加
[self.destinationObject objectForKey:@"uid"];
日志
2013-03-14 10:16:08.030 Project[55836:2203] -[ItemObject objectForKey:]: unrecognized selector sent to instance 0x103437e80
【问题讨论】：
如果你使用“identifier”而不是“id”，行为会改变吗？您是在 @synthesizing id 属性（或使用最新版本的 Xcode 以便您不需要）？ 它没有改变。我什至删除了 Id，然后收到title 的错误我正在为我准备 xcode 自动合成器。
@JesseRusak 我已经更新了我的代码以防止混淆
你可以为你的 ItemObject 类发布@implementation 吗？
您是否也发布self.destinationObject 的超类链（即NSStringFromClass([self.destinationObject class])、NSStringFromClass([[self.destinationObject class] superclass]) 以确认您的类确实被使用？您是否也尝试直接调用[self.destinationObject uid]？
【参考方案1】：
您在实现中使用的@dynamic 指令告诉编译器不要为该属性生成方法。由于这些方法不存在，因此您的类与这些键的键值不兼容。 （即 RestKit 正在尝试调用 uid 方法，但它不存在。）
您应该：
删除@dynamic 声明（以便编译器合成所需的方法）或 添加您自己的uid 和setUid: 实现
【讨论】：
就是这样！！！ GRRRR。说得通。我刚刚复制了我的核心数据控制器并将NSManagedObject更改为NSObject非常感谢！以上是关于RestKit 模型对象引发 -valueForUndefinedKey: 用于合成属性的主要内容，如果未能解决你的问题，请参考以下文章