RestKit 0.20无法从服务器获取数据

Question

我是Core Data和RestKit的新手，我已经阅读了许多有关Core Data和RestKit的教程，但是我仍然无法从服务器获取数据。 在我的应用程序中，我需要获取数据，将其存储在设备上，如果有或没有互联网连接，则可以从DB加载数据，我知道RestKit可以为我做到这一点，但是当我尝试从http：/获取数据时/salatiki.com.ua/api/get.php?getSaladsType我看到一些错误，什么也没有发生，请帮助我，我在做什么错？ 对于任何有用的参考，我将不胜感激。 谢谢。

我有带有“ SCategory”实体的Model.xxdatamodelid

#import <Foundation/Foundation.h>
#import <CoreData/CoreData.h>

@interface SCategory : NSManagedObject

@property (nonatomic, retain) NSString * cName;
@property (nonatomic, retain) NSNumber * cId;
@property (nonatomic, retain) NSString * cSection;
@property (nonatomic, retain) NSString * cImage;

@end

在AppDelegate.m中

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    NSManagedObjectModel *managedObjectModel = [NSManagedObjectModel mergedModelFromBundles:nil];
    RKManagedObjectStore *managedObjectStore = [[RKManagedObjectStore alloc] initWithManagedObjectModel:managedObjectModel];
    [RKMIMETypeSerialization registerClass:[RKNSJSONSerialization class] forMIMEType:@"text/html"];
    NSError *error = nil;
    BOOL success = RKEnsureDirectoryExistsAtPath(RKApplicationDataDirectory(), &error);
    if (! success) {
        RKLogError(@"Failed to create Application Data Directory at path '%@': %@", RKApplicationDataDirectory(), error);
    }
    NSString *path = [RKApplicationDataDirectory() stringByAppendingPathComponent:@"Store.sqlite"];
    NSPersistentStore *persistentStore = [managedObjectStore addSQLitePersistentStoreAtPath:path fromSeedDatabaseAtPath:nil withConfiguration:nil options:nil error:&error];
    if (! persistentStore) {
        RKLogError(@"Failed adding persistent store at path '%@': %@", path, error);
    }
    [managedObjectStore createManagedObjectContexts];

    RKObjectManager *manager = [RKObjectManager managerWithBaseURL:[NSURL URLWithString:@"http://salatiki.com.ua"]];
    manager.managedObjectStore = managedObjectStore;

    RKEntityMapping *categoryMapping = [RKEntityMapping mappingForEntityForName:NSStringFromClass([SCategory class]) inManagedObjectStore:managedObjectStore];
    [categoryMapping addAttributeMappingsFromDictionary:@{ @"img": @"cImage",
                                                           @"section": @"cSection",
                                                           @"vid" : @"cId",
                                                           @"vname" : @"cName" }];

    NSIndexSet *statusCodes = RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful); // Anything in 2xx
    RKResponseDescriptor *responseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:categoryMapping method:RKRequestMethodGET pathPattern:@"/api/get.php?getSaladsType" keyPath:nil statusCodes:statusCodes];

    [[RKObjectManager sharedManager] addResponseDescriptor:responseDescriptor];
    [manager getObjectsAtPath:@"/api/get.php?getSaladsType" parameters:nil success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
        NSLog(@"map arr: %@", mappingResult.array);
    } failure:^(RKObjectRequestOperation *operation, NSError *error) {
        NSLog(@"request error");
    }];

    // Override point for customization after application launch.
    return YES;
}

日志：

    014-11-02 13:31:41.742 Salatiki[2000:3713] E restkit.network:RKObjectRequestOperation.m:213 GET 'http://salatiki.com.ua/api/get.php?getSaladsType' 
(200 OK / 0 objects) [request=0.0000s mapping=0.0000s total=0.0267s]: Error
 Domain=org.restkit.RestKit.ErrorDomain Code=1001 "No response descriptors match the 
response loaded." UserInfo=0x7f9fb883c880 {NSLocalizedFailureReason=A 200 response was 
loaded from the URL 'http://salatiki.com.ua/api/get.php?getSaladsType', which failed to 
match all (0) response descriptors:, NSErrorFailingURLStringKey=http://salatiki.com.ua/api/get.php?getSaladsType, 
NSErrorFailingURLKey=http://salatiki.com.ua/api/get.php?getSaladsType, 
NSUnderlyingError=0x7f9fb883c3c0 "No mappable object representations were found at the 
key paths searched.", keyPath=null, NSLocalizedDescription=No response descriptors match 
the response loaded.}
    2014-11-02 13:31:41.766 Salatiki[2000:613] I restkit.network:RKObjectRequestOperation.m:150 GET 'http://salatiki.com.ua/api/get.php?
getSaladsType'
    2014-11-02 13:31:41.766 Salatiki[2000:613] request error

Answer 1

您将无法使用http://salatiki.com.ua/api/get.php?getSaladsType的URL，因为您在查询参数中添加了很多含义，而RestKit并未将查询参数用于响应描述符图案。

如果您仅对这一请求使用get.php ，则只需从响应描述符路径模式中删除?getSaladsType ，它就可以工作。 如果您将它用于多种用途，则需要停止使用RestKit，更改服务器，以免使用类似这样的查询参数或编辑RestKit ...

Answer 2

最后，我找到了解决方案，所有问题都在RKResponseDescriptor ，在我的情况下pathPattern应该为nil，我不知道为什么，但是它有效！