RestKit响应无法反序列化为对象

Question

我在使用RestKit发布请求期间将响应映射回对象时遇到问题.

这是代码:

请求:

// mapping for the response. response is an object: {"response":"message","success":bool}
RKObjectMapping *responseMapping = [RKObjectMapping mappingForClass:[GenericResponse class]];
    [responseMapping addAttributeMappingsFromArray:@[@"success",@"response"]];
    responseMapping.setDefaultValueForMissingAttributes = YES;
    RKResponseDescriptor *responseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:responseMapping pathPattern:@"/authenticate" keyPath:nil statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];

    // mapping for the request body
    RKObjectMapping *requestMapping = [RKObjectMapping requestMapping];
    [requestMapping addAttributeMappingsFromArray:@[@"username", @"password"]];
    RKRequestDescriptor *requestDescriptor = [RKRequestDescriptor requestDescriptorWithMapping:requestMapping objectClass:[LoginCriteria class] rootKeyPath:nil];

    // set up the request
    RKObjectManager *manager = [RKObjectManager managerWithBaseURL:[NSURL URLWithString:@"http://localhost:8080"]];
    [manager addResponseDescriptor:responseDescriptor];
    [manager addRequestDescriptor:requestDescriptor];
    [manager setRequestSerializationMIMEType:@"application/json"];

    // set up the LoginCriteria object
    LoginCriteria* loginCriteria = [LoginCriteria new];
    loginCriteria.password = @"test";
    loginCriteria.username = @"test";

    // make the request
    [manager postObject:loginCriteria path:@"/authenticate" parameters:nil
    success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
            GenericResponse *genericResponse = (GenericResponse*)mappingResult;
            NSLog(@"logged in: %@", [mappingResult array]);
    } failure:^(RKObjectRequestOperation *operation, NSError *error) {
        NSLog(@"login failed");
    }];

GenericResponse.h:

@interface GenericResponse : NSObject
@property (nonatomic) Boolean* success;
@property (nonatomic, copy) NSString* response;
@end

日志:

2012-12-17 15:44:22.890 Radiuus[8221:1703] T restkit.network:RKHTTPRequestOperation.m:139 POST 'http://localhost:8080/authenticate':
request.headers={
    Accept = "application/json";
    "Accept-Language" = "en, fr, de, ja, nl, it, es, pt, pt-PT, da, fi, nb, sv, ko, zh-Hans, zh-Hant, ru, pl, tr, uk, ar, hr, cs, el, he, ro, sk, th, id, ms, en-GB, ca, hu, vi, en-us;q=0.8";
    "Content-Type" = "application/json; charset=utf-8";
    "User-Agent" = "Radiuus/1.0 (iPhone Simulator; iOS 6.0; Scale/1.00)";
}
request.body=(null)
2012-12-17 15:44:23.244 Radiuus[8221:5d0b] T restkit.network:RKHTTPRequestOperation.m:156 POST 'http://localhost:8080/authenticate' (200):
response.headers={
    "Content-Type" = "application/json";
    Date = "Mon, 17 Dec 2012 20:44:23 GMT";
    Server = "Apache-Coyote/1.1";
    "Transfer-Encoding" = Identity;
}
response.body={"response":"authentication succeeded","success":true}
2012-12-17 15:44:23.246 Radiuus[8221:4f03] W restkit.object_mapping:RKMapperOperation.m:76 Adding mapping error: Expected an object mapping for class of type 'LoginCriteria', provider returned one for 'GenericResponse'

从日志中,对我来说很奇怪的是,似乎RestKit期望反序列化对LoginCriteria对象的响应,但是当它正确获取GenericResponse对象时"失败",这当然是正确的.

任何帮助是极大的赞赏!

Answer 1

感谢您对问题的回答,因为它引导我找到了如何使用RestKit内置方法之一来解决此问题而不是修改核心代码的正确方向.

从他的文档https://github.com/RestKit/RestKit/wiki/Object-mapping中,在Core Data Post/Put部分的处理多个根对象中,他提到如果你想发布一种类型的对象,但是收到另一个响应,那么你必须nil走出targetObject的请求操作.他的文档中缺少一个完整的示例,因此这里是我使用的代码块:

RKManagedObjectRequestOperation *operation = [RKObjectManager.sharedManager appropriateObjectRequestOperationWithObject: objectToBePOSTed method:RKRequestMethodPOST path: path parameters: params];
operation.targetObject = nil;
[operation setCompletionBlockWithSuccess:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
    //handle success
} failure:^(RKObjectRequestOperation *operation, NSError *error) {
    //handle failure
}];
[RKObjectManager.sharedManager enqueueObjectRequestOperation:operation];

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