Ios Restkit：如何配置映射以发布NSManagedObject的嵌套数组_Ios_Arrays_Restkit_One To Many_Restkit 0.20

Ios Restkit：如何配置映射以发布NSManagedObject的嵌套数组

ios arrays

Ios Restkit：如何配置映射以发布NSManagedObject的嵌套数组,ios,arrays,restkit,one-to-many,restkit-0.20,Ios,Arrays,Restkit,One To Many,Restkit 0.20,请跳过此部分以更新3 环境：iOS7.1、MagicalRecord、Restkit、Mogenerator 所需的JSON表单如下所示： {"amount":[10,20,50]} (set of TSNDecimal's in TSNTagAmountRequest) 请求涉及以下实体： @interface TSNTagAmountRequest: NSManagedObject @property (nonatomic, strong) NSSet *amount; @end 其中

请跳过此部分以更新3

环境：iOS7.1、MagicalRecord、Restkit、Mogenerator

所需的JSON表单如下所示：

{"amount":[10,20,50]}  (set of TSNDecimal's in TSNTagAmountRequest)

请求涉及以下实体：

@interface TSNTagAmountRequest: NSManagedObject
@property (nonatomic, strong) NSSet *amount;
@end

其中，金额集合为TSNDecimal的集合：

@interface TSNDecimal: NSManagedObject
@property (nonatomic, strong) NSDecimalNumber* number;
@end

名为number的十进制数是一个帮助器

TSNDecimal的RKObjectMapping：

RKEntityMapping *decimalMapping = [RKEntityMapping 
                                       mappingForEntityForName:@"TSNDecimal" 
                                          inManagedObjectStore:managedObjectStore];

// map the value in JSON directly to the helper "number"
[decimalMapping addPropertyMapping:
    [RKAttributeMapping attributeMappingFromKeyPath:nil toKeyPath:@"number"]];

前一行代码是我希望将“amount”：[10,20,50]正确反序列化为三个TSNDecimal，分别为它们的number属性（它可以工作），并且它应该正确地从TSNDecimal集合（通过number）序列化为JSON：“amount”：[10,20..]它在解析响应时工作，但在解析请求时不工作

其余是关系映射：

RKPropertyMapping* decimalPropertyMappingAmount =
    [RKRelationshipMapping relationshipMappingFromKeyPath:@"amount"
                                                toKeyPath:@"amount"
                                              withMapping:decimalMapping];

    RKObjectMapping* decimalMappingInverse        = [(RKEntityMapping*)decimalMapping inverseMapping];

    RKPropertyMapping* decimalPropertyMappingAmountInverse =
                  [RKRelationshipMapping relationshipMappingFromKeyPath:@"amount"
                                                              toKeyPath:@"amount"
                                                   withMapping:decimalMappingInverse];

    [tagAmountRequestMapping addPropertyMapping:decimalPropertyMappingAmountInverse];


requestDescriptor = [RKRequestDescriptor requestDescriptorWithMapping:tagAmountRequestMapping
                                                          objectClass:[TSNTagAmountRequest class]
                                                          rootKeyPath:nil
                                                               method:RKRequestMethodPOST];
[_rkManager addRequestDescriptor:requestDescriptor];

（我还尝试了从KeyPath:@“amount.number”到TokePath:@“amount”，但由于向KVC（[self.object valueForKey:key]）传递了不正确的路径，因此引发了异常。）

最后，我定义了TSNTagAmountRequest和TSNDecimal之间的关系： TagaMonterRequestMapping=[RKObjectMapping requestMapping]； [TagaMonetRequestMapping addPropertyMapping:decimalPropertyMappingAmount]

并将描述符添加到RK管理器：

requestDescriptor = [RKRequestDescriptor 
            requestDescriptorWithMapping:tagAmountRequestMapping
                             objectClass:[TSNTagAmountRequest class]
                             rootKeyPath:nil
                                  method:RKRequestMethodPOST];

[_rkManager addRequestDescriptor:requestDescriptor];

问题是，NSJSONSerialization数据中出现异常，JSONObject:optionserror:显然是因为TSNDecimal没有从TSNDecimal.number转换为NSJSONSerialization理解的NSDecimalNumber

例外情况： JSON写入（TSNDecimal）中的类型无效。因为RKNSJSONSerialization中的dataFromObject中的数据包含由RKObjectMappingOperationDataSource（非RKManagedObjectMappingOperationDataSource）创建的TSNDecimal对象

执行其任务并将“number”转换回nil（即，转换为集合中的未命名项），但它不以这种方式工作。这是有道理的，但如果我想编写JSON正文，使用[RKResponseDescriptor ResponseDescriptor WithMapping:从响应进行解析会让我感到困惑

[decimalMapping addPropertyMapping:[RKAttributeMapping attributeMappingFromKeyPath:nil toKeyPath:@"number"]];
RKPropertyMapping* decimalPropertyMappingAmount =
    [RKRelationshipMapping relationshipMappingFromKeyPath:@"amount"
                                                toKeyPath:@"amount"
                                              withMapping:decimalMapping];

为什么不请求呢

我看到的问题是CoreData:错误：未能调用NSManagedObject类“TSNDecimal”上的指定初始值设定项
核心数据对象初始化为

TSNTagAmountRequest* request = [TSNTagAmountRequest requestWithModel:self]; TSNDecimal* decimalEntity = nil; for(NSDecimalNumber* number in amount) { decimalEntity = [TSNDecimal MR_createEntity]; decimalEntity.number = number; [request addAmountObject:decimalEntity]; }
以下是日志：

D restkit.object_mapping:RKMappingOperation.m:860 Starting mapping operation... T restkit.object_mapping:RKMappingOperation.m:861 Performing mapping operation: <RKMappingOperation 0x9681ca0> for '__NSDictionaryM' object. Mapping values from object <TSNTagAmountRequest: 0xf7b8c90> (entity: TSNTagAmountRequest; id: 0xf784700 <x-coredata:///TSNTagAmountRequest/tB2DF8887-7E6C-420F-998A-D250751E5CED164> ; data: { amount = ( "0x9664220 <x-coredata:///TSNDecimal/tB2DF8887-7E6C-420F-998A-D250751E5CED165>", "0x9616390 <x-coredata:///TSNDecimal/tB2DF8887-7E6C-420F-998A-D250751E5CED166>" ); }) ((null)) to object { } with object mapping (null) D restkit.object_mapping:RKMappingOperation.m:641 Mapping one to many relationship value at keyPath 'amount' to 'amount' CoreData: error: Failed to call designated initializer on NSManagedObject class 'TSNDecimal' T restkit.object_mapping:RKMappingOperation.m:542 Performing nested object mapping using mapping <RKRelationshipMapping: 0x95a0df0 amount => amount> for data: <TSNDecimal: 0x9652900> (entity: TSNDecimal; id: 0x9664220 <x-coredata:///TSNDecimal/tB2DF8887-7E6C-420F-998A-D250751E5CED165> ; data: { number = 5; }) D restkit.object_mapping:RKMappingOperation.m:860 Starting mapping operation... T restkit.object_mapping:RKMappingOperation.m:861 Performing mapping operation: <RKMappingOperation 0x96b3d60> for 'TSNDecimal' object. Mapping values from object <TSNDecimal: 0x9652900> (entity: TSNDecimal; id: 0x9664220 <x-coredata:///TSNDecimal/tB2DF8887-7E6C-420F-998A-D250751E5CED165> ; data: { number = 5; }) ({ mapping = { collectionIndex = 3221208359; }; }) to object <TSNDecimal: 0x96b2880> (entity: (null); id: (null) ; data: { }) with object mapping (null) T restkit.object_mapping:RKMappingOperation.m:439 Found transformable value at keyPath '(null)'. Transforming from class 'TSNDecimal' to 'NSDecimalNumber' E restkit.object_mapping:RKMappingOperation.m:441 Failed transformation of value at keyPath '(null)' to representation of type 'NSDecimalNumber': Error Domain=org.restkit.RKValueTransformers.ErrorDomain Code=3002 "Failed transformation of value '<TSNDecimal: 0x9652900> (entity: TSNDecimal; id: 0x9664220 <x-coredata:///TSNDecimal/tB2DF8887-7E6C-420F-998A-D250751E5CED165> ; data: { number = 5; }) ({ mapping = { collectionIndex = 3221208359; }; })' to NSDecimalNumber: none of the 2 value transformers consulted were successful." UserInfo=0x96bd900 {detailedErrors=( "Error Domain=org.restkit.RKValueTransformers.ErrorDomain Code=3002 \"The given value is not already an instance of 'NSDecimalNumber'\" UserInfo=0x96bd630 {NSLocalizedDescription=The given value is not already an instance of 'NSDecimalNumber'}", "Error Domain=org.restkit.RKValueTransformers.ErrorDomain Code=3000 \"Expected an `inputValue` of type `NSNull`, but got a `TSNDecimal`.\" UserInfo=0x96bd720 {NSLocalizedDescription=Expected an `inputValue` of type `NSNull`, but got a `TSNDecimal`.}" ), NSLocalizedDescription=Failed transformation of value '<TSNDecimal: 0x9652900> (entity: TSNDecimal; id: 0x9664220 <x-coredata:///TSNDecimal/tB2DF8887-7E6C-420F-998A-D250751E5CED165> ; data: { number = 5; }) ({ mapping = { collectionIndex = 3221208359; }; })' to NSDecimalNumber: none of the 2 value transformers consulted were successful.} T restkit.object_mapping:RKMappingOperation.m:519 Did not find mappable attribute value keyPath '(null)' D restkit.object_mapping:RKMappingOperation.m:905 Mapping operation did not find any mappable values for the attribute and relationship mappings in the given object representation D restkit.object_mapping:RKMappingOperation.m:927 Failed mapping operation: No mappable values found for any of the attributes or relationship mappings W restkit.object_mapping:RKMappingOperation.m:553 WARNING: Failed mapping nested object: No mappable values found for any of the attributes or relationship mappings

使用错误的构造函数new（这就是为什么我在日志中看到coredata错误：coredata:error:未能调用NSManagedObject类上指定的初始值设定项）的原因。self.dataSource调用错误的映射操作：targetObjectForRepresentation:因为它是非托管对象的数据源（RKObjectMappingOperationDataSource）。它应该是RKManagedObjectMappingOperationDataSource
我猜这可能与RKObjectMapping v.RKEntityMapping问题有关。但当我将RKEntityMapping用于TSNTagAmountRequest时：

tagAmountRequestMapping = [RKEntityMapping mappingForEntityForName:[TSNTagAmountRequest class] inManagedObjectStore:managedObjectStore];
然后我得到了错误：*由于未捕获的异常“NSInvalidArgumentException”而终止应用程序，原因：“
RKRequestDescriptor
对象必须使用其目标类为
NSMutableDictionary
、获得了“TSNTagAmountRequest”（请参见
[RKObjectMapping requestMapping]
）的映射进行初始化”**
更新2 我更改了实现，使其使用反向映射：

RKPropertyMapping* decimalPropertyMappingAmount = [RKRelationshipMapping relationshipMappingFromKeyPath:@"amount" toKeyPath:@"amount" withMapping:decimalMapping];

RKObjectMapping* decimalMappingInverse = [(RKEntityMapping*)decimalMapping inverseMapping]; RKPropertyMapping* decimalPropertyMappingAmountInverse = [RKRelationshipMapping relationshipMappingFromKeyPath:@"amount" toKeyPath:@"amount" withMapping:decimalMappingInverse]; [tagAmountRequestMapping addPropertyMapping:decimalPropertyMappingAmountInverse]; requestDescriptor = [RKRequestDescriptor requestDescriptorWithMapping:tagAmountRequestMapping objectClass:[TSNTagAmountRequest class] rootKeyPath:nil method:RKRequestMethodPOST]; [_rkManager addRequestDescriptor:requestDescriptor];
映射操作结束时输出异常JSON字典中的键无效（非字符串）：

( { 5 = { }; }, { 100 = { }; } )
和日志：

D restkit.object_mapping:RKMappingOperation.m:860 Starting mapping operation... T restkit.object_mapping:RKMappingOperation.m:861 Performing mapping operation: <RKMappingOperation 0xf844d50> for '__NSDictionaryM' object. Mapping values from object <TSNTicketAmountApiRequest: 0xf80e9b0> (entity: TSNTicketAmountApiRequest; id: 0xf86bbe0 <x-coredata:///TSNTicketAmountApiRequest/t5BFB6379-F8EB-4367-A53B-E1B3C531A34F66> ; data: { amount = ( "0xf8c3b30 <x-coredata:///TSNDecimalApiTO/t5BFB6379-F8EB-4367-A53B-E1B3C531A34F67>", "0xf80c370 <x-coredata:///TSNDecimalApiTO/t5BFB6379-F8EB-4367-A53B-E1B3C531A34F68>" ); }) ((null)) to object { } with object mapping (null) T restkit.object_mapping:RKMappingOperation.m:454 Mapping attribute value keyPath 'token' to 'token' T restkit.object_mapping:RKMappingOperation.m:470 Mapped attribute value from keyPath 'token' to 'token'. Value: SXppH1ajA9OspKHkQ6Uwi7dD7AoYVP7J:api T restkit.object_mapping:RKMappingOperation.m:454 Mapping attribute value keyPath 'bonification' to 'bonification' T restkit.object_mapping:RKMappingOperation.m:470 Mapped attribute value from keyPath 'bonification' to 'bonification'. Value: 1 D restkit.network:RKObjectParameterization.m:129 Serialized NSDecimalNumber value at keyPath to __NSCFString (1) T restkit.object_mapping:RKMappingOperation.m:454 Mapping attribute value keyPath 'isNetCurrency' to 'isNetCurrency' T restkit.object_mapping:RKMappingOperation.m:470 Mapped attribute value from keyPath 'isNetCurrency' to 'isNetCurrency'. Value: 0 D restkit.network:RKObjectParameterization.m:129 Serialized __NSCFNumber value at keyPath to __NSCFBoolean (0) D restkit.object_mapping:RKMappingOperation.m:641 Mapping one to many relationship value at keyPath 'amount' to 'amount' T restkit.object_mapping:RKMappingOperation.m:542 Performing nested object mapping using mapping <RKRelationshipMapping: 0xf87bf40 amount => amount> for data: <TSNDecimalApiTO: 0xf8f0a60> (entity: TSNDecimalApiTO; id: 0xf8c3b30 <x-coredata:///TSNDecimalApiTO/t5BFB6379-F8EB-4367-A53B-E1B3C531A34F67> ; data: { number = 5; }) D restkit.object_mapping:RKMappingOperation.m:860 Starting mapping operation... T restkit.object_mapping:RKMappingOperation.m:861 Performing mapping operation: <RKMappingOperation 0x93779f0> for '__NSDictionaryM' object. Mapping values from object <TSNDecimalApiTO: 0xf8f0a60> (entity: TSNDecimalApiTO; id: 0xf8c3b30 <x-coredata:///TSNDecimalApiTO/t5BFB6379-F8EB-4367-A53B-E1B3C531A34F67> ; data: { number = 5; }) ({ mapping = { collectionIndex = 3221208359; }; }) to object { } with object mapping (null) T restkit.object_mapping:RKMappingOperation.m:439 Found transformable value at keyPath 'number'. Transforming from class 'NSDecimalNumber' to 'NSMutableDictionary' T restkit.object_mapping:RKMappingOperation.m:454 Mapping attribute value keyPath 'number' to '(null)' T restkit.object_mapping:RKMappingOperation.m:470 Mapped attribute value from keyPath 'number' to '(null)'. Value: { 5 = { }; } D restkit.object_mapping:RKMappingOperation.m:929 Finished mapping operation successfully... T restkit.object_mapping:RKMappingOperation.m:542 Performing nested object mapping using mapping <RKRelationshipMapping: 0xf87bf40 amount => amount> for data: <TSNDecimalApiTO: 0xf8f0ea0> (entity: TSNDecimalApiTO; id: 0xf80c370 <x-coredata:///TSNDecimalApiTO/t5BFB6379-F8EB-4367-A53B-E1B3C531A34F68> ; data: { number = 100; }) D restkit.object_mapping:RKMappingOperation.m:860 Starting mapping operation... T restkit.object_mapping:RKMappingOperation.m:861 Performing mapping operation: <RKMappingOperation 0x9311160> for '__NSDictionaryM' object. Mapping values from object <TSNDecimalApiTO: 0xf8f0ea0> (entity: TSNDecimalApiTO; id: 0xf80c370 <x-coredata:///TSNDecimalApiTO/t5BFB6379-F8EB-4367-A53B-E1B3C531A34F68> ; data: { number = 100; }) ({ mapping = { collectionIndex = 3221208359; }; }) to object { } with object mapping (null) T restkit.object_mapping:RKMappingOperation.m:439 Found transformable value at keyPath 'number'. Transforming from class 'NSDecimalNumber' to 'NSMutableDictionary' T restkit.object_mapping:RKMappingOperation.m:454 Mapping attribute value keyPath 'number' to '(null)' T restkit.object_mapping:RKMappingOperation.m:470 Mapped attribute value from keyPath 'number' to '(null)'. Value: { }; } D restkit.object_mapping:RKMappingOperation.m:929 Finished mapping operation successfully... T restkit.object_mapping:RKMappingOperation.m:682 Mapped relationship object from keyPath 'amount' to 'amount'. Value: ( { 5 = { }; }, { 100 = { }; } )
更新3 这个问题归结为如何将JSON中的十进制数数组解析为NSManagedObject的NSSet（从一开始就工作），反之亦然，从NSSet解析为JSON数组（让它工作起来相当令人沮丧）：
就是

TSNTagAmountRequest:{amount:[TSNDecimal, TSNDecimal, TSNDecimal, ...]}
在哪里
及
在哪里

RKPropertyMapping* decimalPropertyMappingAmountInverse = [RKRelationshipMapping relationshipMappingFromKeyPath:@"amount" toKeyPath:@"amount" withMapping:decimalMappingInverse];

RKObjectMapping* decimalMappingInverse = [(RKEntityMapping*)decimalMapping inverseMapping];
在哪里

RKPropertyMapping* decimalPropertyMappingAmountInverse = [RKRelationshipMapping relationshipMappingFromKeyPath:@"amount" toKeyPath:@"amount" withMapping:decimalMappingInverse];

RKObjectMapping* decimalMappingInverse = [(RKEntityMapping*)decimalMapping inverseMapping];
在哪里
方法+（NSData*）dataFromObject:error:from RKNSJSONSerialization无法使用包含NSDictionary:

( { 5 = { }; }, { 100 = { }; } )
在这里，我期望像[5100]这样的东西
应用程序因JSON字典中的键无效（非字符串）而崩溃
我不明白为什么[NSJSONSerialization dataWithJSONObject:object options:0 error:error]；被提供给这个奇怪的字典数组而不是NSDecimalNumber数组
更新4 我已经更改了TSNTagAmountRequest和TSNDecimal之间关系映射的定义，以便TSNDecimal中的值（amount NSSet中的项）使用其属性“number”进行传播
Restkit引擎，即RKMappingOperation.m中的applyRelationshipMappings方法，能够提取数量值5100，但最终JSON的组装方式不正确：

"amount":[{},{}]
缺少值，我就快到了
更新5
为所有涉及的实体设置反向映射后，输入请求描述符，仍然输出（由映射号->nil驱动）与字典字典（而非JSON数组）的组装不正确。唯一的方法是将RKNSJSONSerialization子类化并修复结构，即将字典字典转换为与ns JSON序列化程序兼容的简单nsarray。
为什么无法使用RKRelationshipMapping创建JSON正文
-因为创建JSON是一个请求描述符操作，您只使用响应描述符。除此之外，实际上没有任何限制。我建议您展示真正的代码和真正的JSON，因为您当前的问题没有多大意义。再次感谢您。我已经更新了问题。我s试图解决它，但我自己找不到方法。仍然没有成功。将NSManagedObject的NSSet序列化到JSON数组时，一定有一些明显的问题。您似乎正在取得进展，但在请求和响应描述符用途以及零键路径映射之间存在混淆。通常，创建响应映射并描述tor，然后进行反向映射并创建请求描述符。
RKPropertyMapping* decimalPropertyMappingAmountInverse = [RKRelationshipMapping relationshipMappingFromKeyPath:@"amount" toKeyPath:@"amount" withMapping:decimalMappingInverse];

RKObjectMapping* decimalMappingInverse = [(RKEntityMapping*)decimalMapping inverseMapping];

RKObjectMapping* decimalMapping = [RKEntityMapping mappingForEntityForName:@"TSNDecimal" inManagedObjectStore:managedObjectStore]; [mapping addPropertyMapping:[RKAttributeMapping attributeMappingFromKeyPath:nil toKeyPath:@"number"]]; requestDescriptor = [RKRequestDescriptor requestDescriptorWithMapping:tagAmountRequestMapping objectClass:[TSNTagAmountRequest class] rootKeyPath:TSNServiceClientRemoteRootKeyPathNotNested method:RKRequestMethodPOST]; [_rkManager addRequestDescriptor:requestDescriptor];

( { 5 = { }; }, { 100 = { }; } )

RKPropertyMapping* decimalPropertyMappingAmountInverse = [RKRelationshipMapping relationshipMappingFromKeyPath:@"amount.number" toKeyPath:@"amount" withMapping:decimalApiMappingInverse];

"amount":[{},{}]