Question

我有一个映射嵌套数组的问题。在https://github.com/RestKit/RestKit/blob/master/Docs/Object%20Mapping.md上有一个映射嵌套对象的例子。

但是我必须做什么，如果嵌套对象是一个对象数组，例如JSON看起来像：

{ "articles": [
    { "title": "RestKit Object Mapping Intro",
      "body": "This article details how to use RestKit object mapping...",
      "author": [{
          "name": "Blake Watters",
          "email": "blake@restkit.org"
      },
      {
          "name": "abc",
          "email": "emailaddress"
      }]
      "publication_date": "7/4/2011"
    }]
}

我的课程应该如何才能获得一系列作者？这是示例中的代码：

@interface Author : NSObject
    @property (nonatomic, retain) NSString* name;
    @property (nonatomic, retain) NSString* email;
@end



@interface Article : NSObject
    @property (nonatomic, retain) NSString* title;
    @property (nonatomic, retain) NSString* body;
    @property (nonatomic, retain) Author* author; // should be an array of Author-Objects
    @property (nonatomic, retain) NSDate*   publicationDate;
@end

我怎样才能告诉Restkit，这是一个作者数组，如果我将作者属性的类改为NSArray，那么Restkit如何知道，在这个NSArray中应该是Author-Objects ......？

我正在使用RKObjectMapping将对象从JSON映射到Objective-c，反之亦然。

Answer 1

您需要确保相应地设置var类型：

@interface Article : NSObject
    @property (nonatomic, retain) NSString* title;
    @property (nonatomic, retain) NSString* body;
    @property (nonatomic, retain) NSSet* authors;
    @property (nonatomic, retain) NSDate*   publicationDate;
@end

它可能会将其声明为NSArray，但我个人将RestKit与CoreData模型一起使用，这些场景中的关系是NSSet。

此外，您需要设置映射：

[articleMapping mapKeyPath:@"author" toRelationship:@"authors" withMapping:authorMapping];

Answer 2

拆分它有帮助。

@interface Author : NSObject
    @property (nonatomic, retain) NSString* name;
    @property (nonatomic, retain) NSString* email;
@end



@interface Article : NSObject
    @property (nonatomic, retain) NSString* title;
    @property (nonatomic, retain) NSString* body;
    @property (nonatomic, retain) NSArray* author; 
    @property (nonatomic, retain) NSDate*   publicationDate;
@end


//create the article mapping
RKObjectMapping *articleMapping = [RKObjectMapping mappingForClass:[Article class]];
//add rest of mappings here
[articleMapping addAttributeMappingsFromDictionary:@{
                                                  @"title":@"title"
} 

//create the author mapping
RKObjectMapping *authorMapping = [RKObjectMapping mappingForClass:[Author class]];
//add rest of mappings here
[authorMapping addAttributeMappingsFromDictionary:@{
                                                  @"name":@"name"
} 

//link mapping with a relationship
RKRelationshipMapping *rel = [RKRelationshipMapping relationshipMappingFromKeyPath:@"authors" toKeyPath:@"author" withMapping:authorMapping];

//add relationship mapping to article
[articleMapping addPropertyMapping:rel];

Answer 3

整个响应字符串将其作为nsmutable字典，然后将作者值分配给可变数组..

Answer 4

您需要做的是使用NSSet属性来保存嵌套数组。这是一本完整的指南，可以帮助您做到https://medium.com/ios-os-x-development/restkit-tutorial-how-to-fetch-data-from-an-api-into-core-data-9326af750e10。

Restkit映射嵌套数组

4 个答案: