RestKit 简单的 JSON，错误的 pathPAttern？答案

【问题标题】：RestKit simple JSON, bad pathPAttern?RestKit 简单的 JSON，错误的 pathPAttern？
【发布时间】：2015-07-15 08:40:41
【问题描述】：

JSON：

代码：

NSURL *baseURL = [NSURL URLWithString:@"http://www.krzysztofkurzawa.com"];
RKObjectManager *objectManager = [RKObjectManager managerWithBaseURL:baseURL];

RKLogConfigureByName("RestKit/Network", RKLogLevelTrace);
RKLogConfigureByName("RestKit/ObjectMapping", RKLogLevelTrace);

RKObjectMapping *mapping = [RKObjectMapping mappingForClass:[NSMutableDictionary class]];
[mapping addAttributeMappingsFromArray:@[@"title"]];

RKResponseDescriptor *rk = [RKResponseDescriptor responseDescriptorWithMapping:mapping pathPattern:@"articles" keyPath:@"articles" statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];
[objectManager addResponseDescriptor:rk];

RKObjectMapping *mapping2 = [RKObjectMapping mappingForClass:[NSMutableDictionary class]];
[mapping addAttributeMappingsFromArray:@[@"title"]];

RKResponseDescriptor *rk2 = [RKResponseDescriptor responseDescriptorWithMapping:mapping2 pathPattern:@"articles/:id" keyPath:nil statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];
[objectManager addResponseDescriptor:rk2];


[[RKObjectManager sharedManager] getObjectsAtPath:@"articles" parameters:nil success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
    NSLog(@"%@", [mappingResult firstObject]);
} failure:^(RKObjectRequestOperation *operation, NSError *error) {

}];

[[RKObjectManager sharedManager] getObjectsAtPath:@"articles/1" parameters:nil success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
    NSLog(@"%@", [mappingResult firstObject]);
} failure:^(RKObjectRequestOperation *operation, NSError *error) {

}];

错误：在关键路径中找不到可映射的对象表示已搜索。", keyPath=null, NSLocalizedDescription=无响应描述符与加载的响应匹配。}

我没有任何想法。当 pathPattern 设置为 nil 时，第一个映射有效。为什么一定是nil？也许它是创建休息路径模式所需要的。

【问题讨论】：

为什么在获取对象时使用 [RKObjectManager sharedManager]？我认为你应该更好地使用 objectManager
这是单例 - [RKObjectManager sharedManager]
但是您正在使用在第一行中创建的另一个 RKObjectManager 实例初始化映射 RKObjectManager *objectManager = [RKObjectManager managerWithBaseURL:baseURL];
是的，你是对的。我将 [RKObjectManager sharedManager] 更改为 objectManager。要使用 [RKObjectManager sharedManager] 需要 [RKObjectManager setManager:]。但没有结果。错误“没有可映射的...”
当您尝试加载单个文章时，您的错误出现在第二个请求中？抱歉，我无法运行您的代码，因为 RestKit 在通过 Cocoapods 安装时会出现编译器错误

标签： ios restkit

【解决方案1】：

您的路径不正确，此外，在运行您的代码时，我不得不使用以下方法：

+ (instancetype)responseDescriptorWithMapping:(RKMapping *)mapping
                                       method:(RKRequestMethod)method
                                  pathPattern:(NSString *)pathPattern
                                      keyPath:(NSString *)keyPath
                                  statusCodes:(NSIndexSet *)statusCodes

您正在使用它的那个说它已被弃用。我猜你可能使用的是旧版本的 restkit。

这是有效的代码：

NSURL *baseURL = [NSURL URLWithString:@"http://www.krzysztofkurzawa.com"];
RKObjectManager *objectManager = [RKObjectManager managerWithBaseURL:baseURL];

RKLogConfigureByName("RestKit/Network", RKLogLevelTrace);
RKLogConfigureByName("RestKit/ObjectMapping", RKLogLevelTrace);

RKObjectMapping *mapping = [RKObjectMapping mappingForClass:[NSMutableDictionary class]];
[mapping addAttributeMappingsFromArray:@[@"title"]];

RKResponseDescriptor *rk = [RKResponseDescriptor responseDescriptorWithMapping:mapping method:RKRequestMethodGET pathPattern:@"/articles/" keyPath:@"articles" statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];
[objectManager addResponseDescriptor:rk];

RKObjectMapping *mapping2 = [RKObjectMapping mappingForClass:[NSMutableDictionary class]];
[mapping2 addAttributeMappingsFromArray:@[@"title"]];

RKResponseDescriptor *rk2 = [RKResponseDescriptor responseDescriptorWithMapping:mapping2  method:RKRequestMethodGET pathPattern:@"/articles/:id/" keyPath:nil statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];
[objectManager addResponseDescriptor:rk2];


[[RKObjectManager sharedManager] getObjectsAtPath:@"/articles/" parameters:nil success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
    NSLog(@"%@", [mappingResult firstObject]);
} failure:^(RKObjectRequestOperation *operation, NSError *error) {

}];

[[RKObjectManager sharedManager] getObjectsAtPath:@"/articles/1/" parameters:nil success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
    NSLog(@"%@", [mappingResult firstObject]);
} failure:^(RKObjectRequestOperation *operation, NSError *error) {

}];

【讨论】：

【解决方案2】：

这可能会阻止你

NSString *pathNotation = @"/Notations/:notation_id";    
RKRoute *notationRoute = [RKRoute routeWithClass:[Notation class] pathPattern:pathNotation method:RKRequestMethodGET];
[self.objectManager.router.routeSet addRoute:notationRoute];

RKResponseDescriptor *notationMappingDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:notationMapping method:RKRequestMethodGET pathPattern:pathNotation keyPath:nil statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];

和 GET：

[[RKObjectManager sharedManager] getObject:nil path:path parameters:params success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
        //do something
    } failure:^(RKObjectRequestOperation *operation, NSError *error) {
        //do something
    }];

【讨论】：