Question

我正在使用RESTKIT来映射从服务器返回的JSON。

从服务器获取的JSON结果如下

{"term":"Zh","results":{"users":[{"id":{"$oid":"4ebe59970a614e0019000055"},"term":"some text","score":1}]}

如何将上述JSON结果转换为以下内容：

{"results":{"users":[{"uid":"4ebe59970a614e0019000055","text":"some text"}]}

另外，我在哪里可以这样做，以便RESTKIT映射将使用转换的JSON而不是初始的JSON？

下面是我用来管理JSON和映射的加载器类

-(void)getObjects
{
    RKObjectManager *sharedManager = [RKObjectManager sharedManager];
    [sharedManager loadObjectsAtResourcePath:self.resourcePath delegate:self];
}

- (void)request:(RKRequest*)request didLoadResponse:(RKResponse*)response {
    NSLog(@"Loaded PAYLOAD successfully for %@, with response %@", self.resourcePath , [response bodyAsString]  );
}


- (void)objectLoader:(RKObjectLoader*)objectLoader didLoadObjects:(NSArray*)objects 
{
}


+ (void)setManagerAndMappings
{
    RKObjectManager* manager = [RKObjectManager objectManagerWithBaseURL:SERVER_URL];
    RKObjectMappingProvider* provider = [[RKObjectMappingProvider new] autorelease];

    //User Object Mapping
    RKObjectMapping* userMapping = [RKObjectMapping mappingForClass:[User class]];
    [userMapping mapKeyPath:@"_id" toAttribute:@"uid"];

    [userMapping mapAttributes:@"avatar_url",@"created_at",@"email",@"name",@"nickname",@"follower_count",@"following_count",@"answer_count",@"new_notification_count",@"new_questions_count",@"is_following",@"facebook_configured",@"twitter_configured",@"description",@"approved",@"type", nil];
    [provider setMapping:userMapping forKeyPath:@"user"];

}

Answer 1

@Shocks的答案很有吸引力，不幸的是它在0.20之前的版本是有效的。

无论如何，类似的解决方案也可用于0.20，使用RKSerialization的实现：

@interface ORRKJsonSerialization : NSObject <RKSerialization>
@end

并实施

@implementation ORRKJsonSerialization

+ (id)objectFromData:(NSData *)data error:(NSError **)error
{
    id result = [NSJSONSerialization JSONObjectWithData:data options:0 error:error];
    // change your data before mapping
    return result;
}

+ (NSData *)dataFromObject:(id)object error:(NSError **)error
{
    return [NSJSONSerialization dataWithJSONObject:object options:0 error:error];
}

@end

然后在设置期间：

[RKMIMETypeSerialization registerClass:[ORRKJsonSerialization class] forMIMEType:@"application/json"];

HTH

Answer 2

在解析完成后调用的RKObkectLoaderDelegate中有一个willMapData：选择器。 mappableData argumet是可变的，所以我猜你可以在对象映射发生之前更改数据。

Answer 3

使用RKObjectRequestOperation.setWillMapDeserializedResponseBlock:。

在swift：

    let request = RKObjectManager.sharedManager().requestWith...
    let operation = RKObjectManager.sharedManager().managedObjectRequestOperationWithRequest(request, managedObjectContext: context, success: { operation, result in
        // success
    }, failure: { operation, error in
        // failure
    })
    operation.setWillMapDeserializedResponseBlock { deserializedResponse -> AnyObject! in
        // Here to transform response
        return transformResponse(deserializedResponse)
    }
    RKObjectManager.sharedManager().enqueueObjectRequestOperation(operation)

Answer 4

对我来说，唯一的解决方案是在服务器级别修改返回的对象。如果你不能，只需返回服务器。

Answer 5

您可以注册自己的解析器。我必须这样做才能从遗留系统中修改和清理一些JSON。

[[RKParserRegistry sharedRegistry] setParserClass:[MyJSONParser class]
                                          forMIMEType:@"application/json"];

然后创建自己的：

#import <RestKit/RestKit.h>
#import <RestKit/RKJSONParserJSONKit.h>
#import <RestKit/JSONKit.h>
#import <RestKit/RKLog.h>

@interface EFJSONParser : RKJSONParserJSONKit
- (NSDictionary *)objectFromString:(NSString *)string error:(NSError **)error;
@end

Answer 6

编辑JSOn的响应非常困难。更好的方法是只在服务器端进行更改，如@beber所述

如何在RESTKIT映射之前更改JSON

6 个答案: