Question

我正在使用RKXMLReaderSerialization并尝试将XML响应从我的服务器映射到对象。它成功了，但映射结果中的对象只有空值。

这是我试图从我的服务器映射的text / xml响应：

<Provision version="1.0">
  <FileInfoWrapper>
    <FileUrl>SomeFile.zip</FileUrl>
    <FileName>SomeFile.zip</FileName>
    <FileSha1>oi7NK/rFLL6dXqcu7ahaNfKsGkE=</FileSha1>
    <FileSize>52220448</FileSize>
    <Version>13</Version>
    <Vital>true</Vital>
  </FileInfoWrapper>
</Provision>

这是我的模型对象：

@interface FileInfoWrapper : NSObject

@property NSString *fileUrl;
@property NSString *fileName;
@property NSString *fileSha1;
@property long fileSize;
@property NSString *version;
@property BOOL vital;

@end

我添加了RKXMLReaderSerialization：

[RKMIMETypeSerialization registerClass:[RKXMLReaderSerialization class] forMIMEType:RKMIMETypeTextXML];
[[self objectManager] setAcceptHeaderWithMIMEType:@"application/json,text/xml"];

我认为我正确设置了映射和响应描述符：

RKObjectMapping *fileInfoMapping = [RKObjectMapping mappingForClass:[FileInfoWrapper class]];
[fileInfoMapping addAttributeMappingsFromDictionary:@{
 @"FileUrl":        @"fileUrl",
 @"FileName":       @"fileName",
 @"FileSha1":       @"fileSha1",
 @"FileSize":       @"fileSize",
 @"Version":        @"version",
 @"Vital":          @"vital"}];
RKResponseDescriptor *fileInfoResponseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:fileInfoMapping
                                                                                                method:RKRequestMethodGET
                                                                                           pathPattern:nil
                                                                                               keyPath:@"Provision.FileInfoWrapper"
                                                                                           statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];
[[self objectManager] addResponseDescriptor:fileInfoResponseDescriptor];

但是当我打电话时：

[[self objectManager] getObjectsAtPath:@"static/download/Installer.info.xml"
                            parameters:nil
                               success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
                                   NSLog(@"****Success!****");
                                   NSLog(@"mappingResult: %@", mappingResult);
                                   FileInfoWrapper *fileInfo = [mappingResult firstObject];
                                   NSLog(@"URL: %@", [fileInfo fileUrl]);
                                   NSLog(@"Name: %@", [fileInfo fileName]);
                                   NSLog(@"SHA1: %@", [fileInfo fileSha1]);
                                   NSLog(@"Size: %lx", [fileInfo fileSize]);
                               }
                               failure:^(RKObjectRequestOperation *operation, NSError *error) {
                                   NSLog(@"****Failure!****");
                               }];

所有值均为null：

I restkit.network:RKObjectRequestOperation.m:180 GET 'http://example.com/static/download/Installer.info.xml'
I restkit.network:RKObjectRequestOperation.m:250 GET 'http://example.com/static/download/Installer.info.xml' (200 OK / 1 objects) [request=0.1080s mapping=0.0060s total=0.1226s]
****Success!****
mappingResult: <RKMappingResult: 0x10064b190, results={
    "Provision.FileInfoWrapper" = "<FileInfoWrapper: 0x10065f780>";
}>
URL: (null)
Name: (null)
SHA1: (null)
Size: 0

我做错了什么？

更新：我启用了RestKit / ObjectMapping日志记录并获得了一些其他信息：

D restkit.object_mapping:RKMapperOperation.m:377 Executing mapping operation for representation: {
    Provision =     {
        FileInfoWrapper =         {
            FileName =             {
                text = "SomeFile.zip";
            };
            FileSha1 =             {
                text = "oi7NK/rFLL6dXqcu7ahaNfKsGkE=";
            };
            …
}
 and targetObject: (null)
T restkit.object_mapping:RKMapperOperation.m:320 Examining keyPath 'Provision.FileInfoWrapper' for mappable content...
D restkit.object_mapping:RKMapperOperation.m:300 Found mappable data at keyPath 'Provision.FileInfoWrapper': {
    FileName =     {
        text = "SomeFile.zip";
    };
    FileSha1 =     {
        text = "oi7NK/rFLL6dXqcu7ahaNfKsGkE=";
    };
    …
}
D restkit.object_mapping:RKMapperOperation.m:231 Asked to map source object {
    FileName =     {
        text = "SomeFile.zip";
    };
    FileSha1 =     {
        text = "oi7NK/rFLL6dXqcu7ahaNfKsGkE=";
    };
    …
} with mapping <RKObjectMapping:0x10025e6b0 objectClass=FileInfoWrapper propertyMappings=(
    "<RKAttributeMapping: 0x10025ebc0 FileSha1 => fileSha1>",
    "<RKAttributeMapping: 0x10025ed90 FileName => fileName>"
    …
)>
D restkit.object_mapping:RKMappingOperation.m:952 Starting mapping operation...
T restkit.object_mapping:RKMappingOperation.m:953 Performing mapping operation: <RKMappingOperation 0x10068f730> for 'FileInfoWrapper' object. Mapping values from object {
    FileName =     {
        text = "SomeFile.zip";
    };
    FileSha1 =     {
        text = "oi7NK/rFLL6dXqcu7ahaNfKsGkE=";
    };
    …
} to object <FileInfoWrapper: 0x10068f290> with object mapping (null)
T restkit.object_mapping:RKMappingOperation.m:550 Mapping attribute value keyPath 'FileUrl' to 'fileUrl'
T restkit.object_mapping:RKMappingOperation.m:431 Found transformable value at keyPath 'FileUrl'. Transforming from type '__NSDictionaryM' to 'NSString'
D restkit.object_mapping:RKPropertyInspector.m:130 Cached property inspection for Class 'FileInfoWrapper': {
    fileName =     {
        isPrimitive = 0;
        keyValueCodingClass = NSString;
        name = fileName;
    };
    fileSha1 =     {
        isPrimitive = 0;
        keyValueCodingClass = NSString;
        name = fileSha1;
    };
    …
}
T restkit.object_mapping:RKMappingOperation.m:583 Skipped mapping of attribute value from keyPath 'FileUrl to keyPath 'fileUrl' -- value is unchanged ((null))
T restkit.object_mapping:RKMappingOperation.m:550 Mapping attribute value keyPath 'FileSha1' to 'fileSha1'
T restkit.object_mapping:RKMappingOperation.m:431 Found transformable value at keyPath 'FileSha1'. Transforming from type '__NSDictionaryM' to 'NSString'
T restkit.object_mapping:RKMappingOperation.m:583 Skipped mapping of attribute value from keyPath 'FileSha1 to keyPath 'fileSha1' -- value is unchanged ((null))
…

Answer 1

您似乎必须从文本节点进行映射。这篇文章有同样的问题：

RestKit 0.20-pre3 with RKXMLReaderSerialization and XMLReader

将映射更改为：

[fileInfoMapping addAttributeMappingsFromDictionary:@{
 @"FileUrl.text":        @"fileUrl",
 @"FileName.text":       @"fileName",
 @"FileSha1.text":       @"fileSha1",
 @"FileSize.text":       @"fileSize",
 @"Version.text":        @"version",
 @"Vital.text":          @"vital",}];

做到了。

Answer 2

如果您期望XML，则不应将accept标头设置为JSON。我也不认为你可以设置这样的逗号分隔列表（虽然不是100％肯定）。如果服务器因接受标头而发送JSON，那么RestKit会对响应感到满意，但实际上可能无法进行任何映射（看起来就像你看到的那样）。

启用跟踪日志记录以获取有关响应和映射的更多信息：

RKLogConfigureByName("RestKit/ObjectMapping", RKLogLevelTrace);

您的映射代码看起来确实正确。

映射XML成功但对象具有空值

2 个答案: