Restkit 将对象映射到 NSArray

Posted 2023-02-23

【中文标题】Restkit 将对象映射到 NSArray

【英文标题】：Restkit mapping objects to NSArray

【发布时间】：2013-12-20 15:38:32

【问题描述】：

我有一个由一些字段组成的对象，例如：

@property (nonatomic, copy)     NSString*               title;
@property (nonatomic, copy)     NSString*               body;
@property (nonatomic, copy)     NSArray*                imageUrls;
@property (nonatomic, copy)     NSString*               postId;
@property (nonatomic)           CLLocationCoordinate2D  location;
@property (nonatomic)           LTUser                  *user;
@property (nonatomic)           LTPlace                 *place;
@property (nonatomic, copy)     NSArray*                comments;

所有NSString 和自定义对象（如LTUser/LTPlace）都映射得很好。

但是，我怎样才能映射到（imageUrls 的NSArray - 这是NSString / comments 的数组 - 这是自定义对象的数组（LTComment））？

"images": [
        "http://****.com/images/1385929903887.jpg",
        "http://****.com/images/131315313131.jpg",
        "http://****.com/images/1351351351.jpg"
]

---

主要对象的映射：

RKObjectMapping *userMapping = [RKObjectMapping mappingForClass:[LTUser class]];
[userMapping addAttributeMappingsFromDictionary:@
                                                  @"_id":@"userId",
                                                  @"username":@"userName",
                                                  @"name":@"name"
                                                  ];   

RKObjectMapping *placeMapping = [RKObjectMapping mappingForClass:[LTPlace class]];
[placeMapping addAttributeMappingsFromDictionary:@
                                                   @"_id":@"placeId",
                                                   @"image":@"name",
                                                   @"name":@"image"
                                                   ];
RKObjectMapping *mapping = [RKObjectMapping mappingForClass:[LTPost class]];

[mapping addAttributeMappingsFromDictionary:@
                                              @"_id" : @"postId",
                                              @"createdAt" : @"createdAt",
                                              @"body" : @"body",
                                              @"title" : @"title"
                                              ];

[mapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"user" toKeyPath:@"user" withMapping:userMapping]];
[mapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"place" toKeyPath:@"place" withMapping:placeMapping]];

RKResponseDescriptor *responseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:mapping
                                                                                        method:RKRequestMethodGET
                                                                                   pathPattern:kLTAPIGetPostsRequest
                                                                                       keyPath:@"posts"
                                                                                   statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];

[[RKObjectManager sharedManager] addResponseDescriptor:responseDescriptor];

---

LT评论映射

RKObjectMapping* commentMapping = [RKObjectMapping mappingForClass:[LTComment class]];
[commentMapping addAttributeMappingsFromDictionary:@
                                                     @"user_name":@"userName",
                                                     @"text":@"text"
                                                     ];

【问题讨论】：

显示您当前的映射。和源 JSON。你已经有LTComment 的映射了吗？

在“主要对象的映射：”之后添加了描述

添加了 LTComment 映射。

【参考方案1】：

comments 的映射应该与 user 和 place 的映射一样（显然只是使用不同的映射，commentMapping）。 RestKit 将确定目标是一个集合，源是一个集合并做正确的事情。

对于imageUrls，JSON 已经是一个字符串数组，所以 RestKit 基本上可以复制它。您需要做的就是添加到“容器”映射（无论是哪个）：

@"images" : @"imageUrls"