RESTKit 的问题,无法正确映射
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【中文标题】RESTKit 的问题,无法正确映射【英文标题】:Problems with RESTKit, cannot map properly 【发布时间】:2013-01-02 11:29:29 【问题描述】:我正在学习 RESTKit,我正在关注this 教程,这是根据之前版本的 RESTKit,并且在 v0.20.0 中发生了很多变化,所以我正在阅读新版本并执行相同的任务在教程中。
现在映射出现问题,我花了好几个小时都没有成功。我得到的错误是:
error: Error Domain=org.restkit.RestKit.ErrorDomain Code=1001 "No response descriptors match the response loaded." UserInfo=0x758d320 NSErrorFailingURLStringKey=https://api.foursquare.com/v2/venues/search?client_id=<client id>&client_secret=KYHQHRYJ4PYFJYEG1F1IQVLQDM4G1HZ1STB2O1VUVUVQZBGS<client secret>&ll=37.33,-122.03&query=coffee&v=20120602, NSLocalizedFailureReason=A 200 response was loaded from the URL 'https://api.foursquare.com/v2/venues/search?client_id=<client id>&client_secret=<client secret>&ll=37.33,-122.03&query=coffee&v=20120602', which failed to match all (1) response descriptors:
<RKResponseDescriptor: 0x9566a60 baseURL=https://api.Foursquare.com/v2/ pathPattern=(null) statusCodes=200-299> failed to match: response URL 'https://api.foursquare.com/v2/venues/search?client_id=<client id>&client_secret=<client secret>&ll=37.33,-122.03&query=coffee&v=20120602' is not relative to the baseURL 'https://api.Foursquare.com/v2/'., NSLocalizedDescription=No response descriptors match the response loaded., keyPath=null, NSErrorFailingURLKey=https://api.foursquare.com/v2/venues/search?client_id=<client id>&client_secret=<client secret>&ll=37.33,-122.03&query=coffee&v=20120602, NSUnderlyingError=0x758d3a0 "No mappable object representations were found at the key paths searched."
Venue.h 是:
#import <Foundation/Foundation.h>
@interface Venue : NSObject
@property (strong, nonatomic) NSString *name;
@end
Venue.m 是:
#import "Venue.h"
@implementation Venue
@synthesize name;
@end
我在 MasterViewController.m 中的 ViewDidAppear 方法中做所有事情,即:
- (void) viewDidAppear:(BOOL)animated
[super viewDidAppear:animated];
NSURL *baseURL = [NSURL URLWithString:@"https://api.Foursquare.com/v2"];
AFHTTPClient * client = [AFHTTPClient clientWithBaseURL:baseURL];
[client setDefaultHeader:@"Accept" value:RKMIMETypeJSON];
RKObjectManager *objectManager = [[RKObjectManager alloc] initWithHTTPClient:client];
RKObjectMapping *venueMapping = [RKObjectMapping mappingForClass:[Venue class]];
[venueMapping addAttributeMappingsFromDictionary:@
@"name" : @"name"
];
RKResponseDescriptor * responseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:venueMapping
pathPattern:nil
keyPath:@"response.venues"
statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];
[objectManager addResponseDescriptor:responseDescriptor];
NSString *latLon = @"37.33,-122.03";
NSString *clientID = [NSString stringWithUTF8String:kCLIENTID];
NSString *clientSecret = [NSString stringWithUTF8String:kCLIENTSECRET];
NSDictionary *queryParams;
queryParams = [NSDictionary dictionaryWithObjectsAndKeys:latLon, @"ll", clientID, @"client_id", clientSecret, @"client_secret", @"coffee", @"query", @"20120602", @"v", nil];
//NSLog(@"object manager: %@ - %@", objectManager.baseURL, [[objectManager responseDescriptors] objectAtIndex:0]);
/*
RKRelationshipMapping* relationShipMapping = [RKRelationshipMapping relationshipMappingFromKeyPath:@"venues"
toKeyPath:@"venues"
withMapping:venueMapping];
[venueMapping addPropertyMapping:relationShipMapping]; */
[objectManager getObjectsAtPath:@"https://api.Foursquare.com/v2/venues/search"
parameters:queryParams
success:^(RKObjectRequestOperation * operaton, RKMappingResult *mappingResult)
NSLog(@"success: mappings: %@", mappingResult);
failure:^(RKObjectRequestOperation * operaton, NSError * error)
NSLog (@"failure: operation: %@ \n\nerror: %@", operaton, error);
];
我检查了浏览器中的响应,一切正常,但由于某种原因,我所做的一切都没有消除错误。我卡在映射的第一步,无法前进。互联网上有关该主题的所有示例和文档都已过时,并且对 RESTKit 的旧版本没有经验,我无法弄清楚。请告诉我我做错了什么。
使用 xcode 4.5 并为 ios6 构建。
响应是(在浏览器上检查):
"meta":"code":200,"response":"venues":["id":"4f482132e4b0f85d07c34cb5","name":"De Anza 3 Coffee Bar","contact":,"location":"address":"10500 De Anza Blvd","lat":37.329438,"lng":-122.03083,"distance":96,"postalCode":"95014","city":"Cupertino","state":"CA","country":"United States","cc":"US","canonicalUrl":"https:\/\/foursquare.com\/v\/de-anza-3-coffee-bar\/4f482132e4b0f85d07c34cb5","categories":["id":"4bf58dd8d48988d1e0931735","name":"Coffee Shop","pluralName":"Coffee Shops","shortName":"Coffee Shop","icon":"prefix":"https:\/\/foursquare.com\/img\/categories\/food\/coffeeshop_","sizes":[32,44,64,88,256],"name":".png","primary":true],"verified":false,"restricted":true,"stats":"checkinsCount":1,"usersCount":1,"tipCount":0,"likes":"count":0,"groups":[],"specials":"count":0,"items":[],"hereNow":"count":0,"groups":[],"referralId":"v-1357121711","id":"40ccea80f964a52019011fe3","name":"Coffee Society","contact":"phone":"4087258091","formattedPhone":"(408) 725-8091","location":"address":"21265 Stevens Creek Blvd","crossStreet":"at Oaks Shopping Center","lat":37.32330342,"lng":-122.047382,"distance":1709,"postalCode":"95014","city":"Cupertino","state":"CA","country":"United States","cc":"US","canonicalUrl":"https:\/\/foursquare.com\/v\/coffee-society\/40ccea80f964a52019011fe3","categories":["id":"4bf58dd8d48988d1e0931735","name":"Coffee Shop","pluralName":"Coffee Shops","shortName":"Coffee Shop","icon":"prefix":"https:\/\/foursquare.com\/img\/categories\/food\/coffeeshop_","sizes":[32,44,64,88,256],"name":".png","primary":true],"verified":false,"restricted":true,"stats":"checkinsCount":2536,"usersCount":869,"tipCount":24,"likes":"count":0,"groups":[],"specials":"count":0,"items":[],"hereNow":"count":0,"groups":[],"referralId":"v-1357121711", .....
【问题讨论】:
【参考方案1】:我尝试将完全相同的教程转换为 0.20 版,最后为我解决的问题是将 URL 设为小写 (https://api.Foursquare.com/v2)。用小写 f 替换那个大写的“F”,所以都是小写的。 RESTKit 似乎需要全部小写并且区分大小写,但我是 iOS 编程和 RESTKit 的新手。
另请注意:
-
不需要 RKRelationshipMapping 的东西
路径模式:无 &
keyPath:@"response.venues"
我相信你已经有了这些,但我想详细一点以防万一。
【讨论】:
非常感谢,我没想到会是这个问题,也感谢您将教程转换为 v0.20 的努力! @Tilo 我们在哪里可以找到您转换后的教程?会有很大帮助的。【参考方案2】:对于来到这里但没有 CAPS 问题的人(比如我),请查看 RestKit 的创建者 this github resolution 的帖子。它帮助我弄清楚了my path issues。
【讨论】:
【参考方案3】:您是否尝试过将 keyPath 简单地称为“venues”而不是“response.venues”?
【讨论】:
【参考方案4】:由于您在自定义 HTTP 客户端中使用了 baseURL,因此请尝试仅使用路径扩展名:
[objectManager getObjectsAtPath:@"/venues/search"
parameters:queryParams
success:^(RKObjectRequestOperation * operaton, RKMappingResult *mappingResult)
NSLog(@"success: mappings: %@", mappingResult);
failure:^(RKObjectRequestOperation * operaton, NSError * error)
NSLog (@"failure: operation: %@ \n\nerror: %@", operaton, error);
];
并在响应描述符中添加路径:
RKResponseDescriptor * responseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:venueMapping
pathPattern:@"/venues/search"
keyPath:@"venues"
statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];
【讨论】:
也试过了,没有成功。我已经构建了这个和其他几个可以在旧版本的 RestKit (0.10.x) 上正常工作的示例,但由于某种原因,我无法在最新版本上正常工作。以上是关于RESTKit 的问题,无法正确映射的主要内容,如果未能解决你的问题,请参考以下文章
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