Ios 列表的RestKit对象映射

我是RestKit新手，正在尝试映射一个json对象，该对象包含我的模型中的一个对象数组。我已调试并发现响应命中我的服务器-->json is return-->RestKit表示映射成功，并且我已映射了1个对象。。。但是，当我执行

BusinessObjectModel*response=result.array.firstObject时，errorCode字段和业务数组（bList）都为空
在OnSuccessBlock中

Json:

要将此Json映射到此目标c对象：

业务对象模型对象映射：

RKObjectMapping *responseMapping = [RKObjectMapping mappingForClass:[BusinessObjectModel class]];
[responseMapping addAttributeMappingsFromDictionary:@{
                                                      @"id":   @"business_id",
                                                      @"name":   @"business_name",
                                                      }];


return responseMapping;

b模型：

  @interface bModel : NSObject
    @property (nonatomic, copy) NSNumber *errorCode;
    @property (nonatomic, copy) NSMutableArray *bList;
    +(RKObjectMapping *) getMapping;
    @end

RKObjectMapping *bMapping = [BusinessObjectModel getMapping];

RKObjectMapping *buslstMapping = [RKObjectMapping mappingForClass:[BModel class]];
[buslstMapping addAttributeMappingsFromDictionary:@{@"errorCode":   @"errorCode"}];
// Define the relationship mapping
[buslstMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:nil
                                                                               toKeyPath:nil
                                                                             withMapping:bussinessMapping]];

return buslstMapping;

b模型对象映射：

  @interface bModel : NSObject
    @property (nonatomic, copy) NSNumber *errorCode;
    @property (nonatomic, copy) NSMutableArray *bList;
    +(RKObjectMapping *) getMapping;
    @end

RKObjectMapping *bMapping = [BusinessObjectModel getMapping];

RKObjectMapping *buslstMapping = [RKObjectMapping mappingForClass:[BModel class]];
[buslstMapping addAttributeMappingsFromDictionary:@{@"errorCode":   @"errorCode"}];
// Define the relationship mapping
[buslstMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:nil
                                                                               toKeyPath:nil
                                                                             withMapping:bussinessMapping]];

return buslstMapping;

描述符如下所示：

 RKResponseDescriptor *responseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:ResponseMapping method:RKRequestMethodAny pathPattern:nil keyPath:@"bList" statusCodes:nil];

编辑

我想将上述Json映射到：

  @interface bModel : NSObject
    @property (nonatomic, copy) NSNumber *errorCode;
    @property (nonatomic, copy) NSMutableArray *bList;
  @end

其中bList是以下对象的数组：

      @interface Business : NSObject
        @property (nonatomic, copy) NSNumber *id;
        @property (nonatomic, copy) NSString *name;
@property (nonatomic, copy) NSNumber *id;
@property (nonatomic, copy) NSNumber *id;
      @end

我想问题是如何处理嵌套关系（对于上述关系，响应描述符必须是什么？
很高兴看到您使用RestKit。您的第一个助手将是RestKit提供的日志记录。在AppDelegate中添加这行代码，并观察控制台是否有错误

// The * will send everything RestKit does to the console    
// Replace the * with the module you want to check (Network/CoreData/...)
RKLogConfigureByName("RestKit/*", RKLogLevelTrace);

查看JSON时，一方面希望从keyPath“bList”获取对象，另一方面希望在出现错误时获取错误代码或消息。RestKit提供了一个内置的错误处理，以从JSON中获取该信息

RKObjectMapping *responseMapping = [RKObjectMapping mappingForClass:[BusinessObjectModel class]];
[responseMapping addAttributeMappingsFromDictionary:@
{
    @"value_from_remote_json": @"value_in_local_object", // e.g. @"id" : @"business_id"
    ...
}];
return responseMapping;

初始化RKErrorMessage类的RKObjectMapping，并使用正确的键路径（包括状态代码范围）向请求添加RKResponseDescriptor（此处使用客户端错误）。RestKit将自动检测错误代码（在标头中发送时），并应用映射以获取错误消息的内容

// Init error mapping
RKObjectMapping *errorMapping = [RKObjectMapping mappingForClass:[RKErrorMessage class]];
[errorMapping addPropertyMapping:[RKAttributeMapping attributeMappingFromKeyPath:nil toKeyPath:@"errorMessage"]];

// Add mapping as response descriptor
RKResponseDescriptor *errorDescriptor = 
[RKResponseDescriptor responseDescriptorWithMapping:errorMapping
                                             method:RKRequestMethodGET
                                        pathPattern:nil                                         
                                            keyPath:@"message" // Edit the keyPath to the value of your JSON (e.g. errorCode)
                                       statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassClientError)];
[RKObjectManager.sharedManager addResponseDescriptor:errorDescriptor];

要在发生故障时获取错误消息，只需获取消息对象。使用块获取对象时，可以使用给定N错误中的userInfo字典

RKErrorMessage *errorMessage = [[error.userInfo objectForKey:RKObjectMapperErrorObjectsKey] firstObject];
NSLog(@"Error: %@", errorMessage);

现在，您可以稍微简化对象模型，并集中精力映射BusinessObjectModel。使用字典映射对象时，需要检查本地属性是否与JSON中的值匹配

RKObjectMapping *responseMapping = [RKObjectMapping mappingForClass:[BusinessObjectModel class]];
[responseMapping addAttributeMappingsFromDictionary:@
{
    @"value_from_remote_json": @"value_in_local_object", // e.g. @"id" : @"business_id"
    ...
}];
return responseMapping;

您不再需要使用RKRelationshipMapping。重新配置对象/映射，然后重试。日志将向您显示提供的映射以及映射操作是否有效。最后一位，通过抛出NSAssert错误，确保映射在内存中

RKObjectMapping *bMapping = [BusinessObjectModel getMapping];
NSAssert(bMapping, @"bMapping mapping must not be nil");

编辑
要将没有键路径的值（如“errorCode”字段）另外映射到对象的映射，需要为对象提供相应的映射。从中选取示例，您将以如下内容结束：

// Init object
@interface RKErrorCode : NSObject
@property (nonatomic) NSNumber *errorCode;
@end

// Init mapping
RKObjectMapping *codeMapping = [RKObjectMapping mappingForClass:[RKErrorCode class]];
[codeMapping addPropertyMapping:[RKAttributeMapping attributeMappingFromKeyPath:nil toKeyPath:@"errorCode"]];

// Add response descriptor for request
RKResponseDescriptor *responseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:codeMapping method:RKRequestMethodAny pathPattern:nil keyPath:@"errorCode" statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];
[[RKObjectManager sharedManager] addResponseDescriptor:responseDescriptor];

很高兴看到您使用RestKit。您的第一个助手将是RestKit提供的日志记录。在AppDelegate中添加这行代码，并观察控制台是否有错误

// The * will send everything RestKit does to the console    
// Replace the * with the module you want to check (Network/CoreData/...)
RKLogConfigureByName("RestKit/*", RKLogLevelTrace);

查看JSON时，一方面希望从keyPath“bList”获取对象，另一方面希望在出现错误时获取错误代码或消息。RestKit提供了一个内置的错误处理，以从JSON中获取该信息

RKObjectMapping *responseMapping = [RKObjectMapping mappingForClass:[BusinessObjectModel class]];
[responseMapping addAttributeMappingsFromDictionary:@
{
    @"value_from_remote_json": @"value_in_local_object", // e.g. @"id" : @"business_id"
    ...
}];
return responseMapping;

初始化RKErrorMessage类的RKObjectMapping，并使用正确的键路径（包括状态代码范围）向请求添加RKResponseDescriptor（此处使用客户端错误）。RestKit将自动检测错误代码（在标头中发送时），并应用映射以获取错误消息的内容

// Init error mapping
RKObjectMapping *errorMapping = [RKObjectMapping mappingForClass:[RKErrorMessage class]];
[errorMapping addPropertyMapping:[RKAttributeMapping attributeMappingFromKeyPath:nil toKeyPath:@"errorMessage"]];

// Add mapping as response descriptor
RKResponseDescriptor *errorDescriptor = 
[RKResponseDescriptor responseDescriptorWithMapping:errorMapping
                                             method:RKRequestMethodGET
                                        pathPattern:nil                                         
                                            keyPath:@"message" // Edit the keyPath to the value of your JSON (e.g. errorCode)
                                       statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassClientError)];
[RKObjectManager.sharedManager addResponseDescriptor:errorDescriptor];

要在发生故障时获取错误消息，只需获取消息对象。使用块获取对象时，可以使用给定N错误中的userInfo字典

RKErrorMessage *errorMessage = [[error.userInfo objectForKey:RKObjectMapperErrorObjectsKey] firstObject];
NSLog(@"Error: %@", errorMessage);

现在，您可以稍微简化对象模型，并集中精力映射BusinessObjectModel。使用字典映射对象时，需要检查本地属性是否与JSON中的值匹配

RKObjectMapping *responseMapping = [RKObjectMapping mappingForClass:[BusinessObjectModel class]];
[responseMapping addAttributeMappingsFromDictionary:@
{
    @"value_from_remote_json": @"value_in_local_object", // e.g. @"id" : @"business_id"
    ...
}];
return responseMapping;

您不再需要使用RKRelationshipMapping。重新配置对象/映射，然后重试。日志将向您显示提供的映射以及映射操作是否有效。最后一位，通过抛出NSAssert错误，确保映射在内存中

RKObjectMapping *bMapping = [BusinessObjectModel getMapping];
NSAssert(bMapping, @"bMapping mapping must not be nil");

编辑
要将没有键路径的值（如“errorCode”字段）另外映射到对象的映射，需要为对象提供相应的映射。从中选取示例，您将以如下内容结束：

// Init object
@interface RKErrorCode : NSObject
@property (nonatomic) NSNumber *errorCode;
@end

// Init mapping
RKObjectMapping *codeMapping = [RKObjectMapping mappingForClass:[RKErrorCode class]];
[codeMapping addPropertyMapping:[RKAttributeMapping attributeMappingFromKeyPath:nil toKeyPath:@"errorCode"]];

// Add response descriptor for request
RKResponseDescriptor *responseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:codeMapping method:RKRequestMethodAny pathPattern:nil keyPath:@"errorCode" statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];
[[RKObjectManager sharedManager] addResponseDescriptor:responseDescriptor];

您的响应描述符不应具有
keyPath:@“bList”
，它应设置为nil，因为您不想钻取

它也不应该使用
ResponseMapping
，根据映射的结构，它应该使用其他映射

您的映射在这里也是错误的：

@{
     @"business_id":   @"business_id",
     @"business_name":   @"business_name",
 }];

应该是：

@{
     @"id":   @"business_id",
     @"name":   @"business_name",
 }];

因为它指定了JSON名称和核心数据名称


若要解决新问题，请将其放回：

[buslstMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"bList" toKeyPath:@"bList"

这是：

 RKResponseDescriptor *responseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:buslstMapping method:RKRequestMethodAny pathPattern:nil keyPath:nil statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];

您的响应描述符不应具有
keyPath:@“bList”
，它应设置为nil，因为您不想钻取

它也不应该使用
ResponseMapping
，根据映射的结构，它应该使用其他映射

您的映射在这里也是错误的：

@{
     @"business_id":   @"business_id",
     @"business_name":   @"business_name",
 }];

应该是：

@{
     @"id":   @"business_id",
     @"name":   @"business_name",
 }];

因为它指定了JSON名称和核心数据名称


若要解决新问题，请将其放回：

[buslstMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"bList" toKeyPath:@"bList"

这是：

 RKResponseDescriptor *responseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:buslstMapping method:RKRequestMethodAny pathPattern:nil keyPath:nil statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];

找到了解决方案，看起来像这样：

    RKObjectMapping *bModelMapping = [RKObjectMapping mappingForClass:[business class]];
[bModelMapping addAttributeMappingsFromDictionary:@{
                                                      @"id":   @"business_id",
                                                      @"name":   @"business_name",
                                                      }];

    RKObjectMapping *buslstMapping = [RKObjectMapping mappingForClass:[bModel class]];
    [buslstMapping addAttributeMappingsFromDictionary:@{@"errorCode":   @"errorCode"}];
    // Define the relationship mapping
    [buslstMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"bList"
                                                                                   toKeyPath:@"bList"                                                                                bModelMapping]];

    return buslstMapping;

同时更改以下内容：

@property (nonatomic, copy) NSMutableArray *bList; 

到

这给了我一个带有错误代码值的
bModel
对象和一个
bList
，它是一个业务数组，然后可以通过执行以下
business*business=[bModel.bList firstObject]将其转换为业务
找到了解决方案，它看起来像这样：

    RKObjectMapping *bModelMapping = [RKObjectMapping mappingForClass:[business class]];
[bModelMapping addAttributeMappingsFromDictionary:@{
                                                      @"id":   @"business_id",
                                                      @"name":   @"business_name",
                                                      }];

    RKObjectMapping *buslstMapping = [RKObjectMapping mappingForClass:[bModel class]];
    [buslstMapping addAttributeMappingsFromDictionary:@{@"errorCode":   @"errorCode"}];
    // Define the relationship mapping
    [buslstMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"bList"
                                                                                   toKeyPath:@"bList"                                                                                bModelMapping]];

    return buslstMapping;

同时更改以下内容：

@property (nonatomic, copy) NSMutableArray *bList; 

到

这给了我一个带有错误代码值的
bModel
对象和一个
bList
，这是一个可以