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标题: iphone - 对象映射 Restkit 不映射嵌套对象 [打印本页]

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作者: 菜鸟教程小白    时间: 2022-12-12 13:14
标题: iphone - 对象映射 Restkit 不映射嵌套对象

我正在尝试映射来自具有 2 个属性的服务器的响应:

• 一个数字，它是数组中对象的计数
• 我已经在其他类中映射的数组用户对象。

这就是我拥有类(class)模型的方式:

及其与具有“参与者”关系的用户类相关。

我知道我要映射的嵌套类正在工作，因为我在其他类中使用它并且效果很好，但是这个实现不同，所以我不知道如何映射它。

我的课上有这个:

.h 类:

#import <Foundation/Foundation.h>
#import <CoreData/CoreData.h>
#import "NSManagedObject+Convenience.h"

@interface DUParticipant : NSManagedObject

@property (nonatomic, retain) NSNumber * participantsCount;
@property (nonatomic, retain) NSSet *participants;

+ (RKEntityMapping *)mapping;
+ (void)configMapping;

@end

.m 类

#import "DUParticipant.h"
#import "DUUser+Ext.h"

@implementation DUParticipant

@dynamic participantsCount;
@dynamic participants;

+ (RKEntityMapping *)mapping
{
    RKEntityMapping* map = [super mapping];

    [map addAttributeMappingsFromDictionary{
        @"participants_count"  : @"participantsCount"
     }];


    return map;
}

+(void) configMapping{


    RKObjectManager* man= [RKObjectManager sharedManager];
    RKEntityMapping* map = [self mapping];
    [man addResponseDescriptor:[RKResponseDescriptor responseDescriptorWithMapping:map pathPattern"/v1/users/participants" keyPath:nil
                                                                       statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)]];

    RKObjectMapping *requestMapping = [RKObjectMapping requestMapping];
    [requestMapping addAttributeMappingsFromDictionary{
        @"participants_count"  : @"participantsCount"
     }];

    [map addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath"participants"
                                                                        toKeyPath"participants"
                                                                      withMapping:[DUUser mapping]]];

    [man addRequestDescriptor:[RKRequestDescriptor requestDescriptorWithMapping:requestMapping
                                                                    objectClass:[DUParticipant class] rootKeyPath"DUParticipant"]];

}

@end

而json的响应是:

{
    "participants_count": 1,
    "participants": [
        {
            "participant": {
                "id": 3,
                "gender": "M",
                "name": "Oscar",
                "lastname": "Lares",
                "username": "CaLe",
                "email": "[email protected]",
                "bio": "UX Designer! Mac Geek, Computers, Gadgets and Movies lover!",
                "created_at": "2012-07-28T18:34:27Z",
                "updated_at": "2013-07-29T13:05:21Z",
                "cover": null,
                "avatar": {
                    "id": 108,
                    "original": "https://duuin.s3.amazonaws.com/uploads/image/file/108/photo.jpg",
                    "thumbnail": "https://duuin.s3.amazonaws.com/uploads/image/file/108/thumb_photo.jpg"
                }
            }
        }
    ]

**** ** 编辑** **** 这是我在日志控制台中的内容，它是 json 响应:

response.body = 
{
    "participants_count": 2,
    "participants": [
        {
            "participant": {
                "id": 3,
                "gender": "M",
                "name": "blabla",
                "lastname": "blabla",
                "username": "blabla",
                "email": "blabla",
                "bio": "blablablablablabla",
                "created_at": "2012-07-28T18:34:27Z",
                "updated_at": "2013-07-29T13:05:21Z",
                "cover": null,
                "avatar": {
                    "id": 108,
                    "original": "blabla",
                    "thumbnail": "blabla"
                }
            }
        },
        {
            "participant": {
                "id": 1,
                "gender": "M",
                "name": "blabla",
                "lastname": "blabla",
                "username": "blabla",
                "email": "blabla",
                "bio": "blabla",
                "created_at": "2012-07-22T20:30:18Z",
                "updated_at": "2013-07-31T03:52:26Z",
                "cover": {
                    "id": 21,
                    "original": "blabla",
                    "thumbnail": "blabla"
                },
                "avatar": {
                    "id": 19,
                    "original": "blabla",
                    "thumbnail": "blabla"
                }
            }
        }
    ]
}

以及日志中的对象:

2013-08-01 13:35:43.949 duuin[24550:c07] Participant: <NSManagedObject: 0x16d7ef00> (entity: DUParticipant; id: 0x16d74170 <x-coredata://1C844BC7-AF17-4D27-90F9-9F5B8ACDF848/DUParticipant/p86> ; data: {
    participants = nil;
    participantsCount = 2;
})

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Best Answer-推荐答案

我认为问题在于您的嵌套类映射。它可能在其他时候也能正常工作，但我猜上下文是不同的。在您显示的代码中，参与者位于字典中的 participant 键中。这需要反射(reflect)在映射中的所有键中。

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大概你的映射当前有:

@"gender" -> @"gender"

但是对于您显示的 JSON，它必须是:

@"participant.gender" -> @"gender"

关于iphone - 对象映射 Restkit 不映射嵌套对象，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/17984176/

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