Question

Iam尝试将Json映射到自定义对象被调用的地方

托管对象类：

@interface Place : NSManagedObject

@property (nonatomic, retain) NSString * icon;
@property (nonatomic, retain) NSString * place_id;
@property (nonatomic, retain) NSString * name;
@property (nonatomic, retain) NSNumber * price_level;
@property (nonatomic, retain) NSNumber * rating;
@property (nonatomic, retain) NSString * vicinity;
@property (nonatomic, retain) NSString * reference;
@property (nonatomic, retain) Geometry *geometry;
@property (nonatomic, retain) Json *json;
@property (nonatomic, retain) NSSet *opening_hours;
@property (nonatomic, retain) NSSet *photos;
@property (nonatomic, retain) NSSet *types;
@end

和json in this formate：

"results" : [
      {
         "geometry" : {
            "location" : {
               "lat" : -33.870540,
               "lng" : 151.1988150
            }
         },
         "icon" : "http://maps.gstatic.com/mapfiles/place_api/icons/cafe-71.png",
         "id" : "c71365287e7606bd21a3311d21fda087830b7813",
         "name" : "Pancakes on the Rocks",
         "opening_hours" : {
            "open_now" : true
         },
         "photos" : [
            {
               "height" : 1224,
               "html_attributions" : [
                  "\u003ca href=\"https://plus.google.com/105663944571530352563\"\u003eJoshua Gilmore\u003c/a\u003e"
               ],
               "photo_reference" : "CnRoAAAAtHLK7ii6I9RN0soDFHF9Zqu1ppyHouUPu-E_BlAP2xlJJLMJrlsBBr3ALzYZ_ysFdgDzJOc-L3NkqQ2FLk5nOAW7LNldTthkSslmbXkXqGbScwCzAwgIj_EyUQlGQjS6d7Ng36nKy_SItlejfeR8zRIQYtT--IxV_d-GfdTcebDjfhoUU7gE_ufZOBxH35EPUtUXbCJk9Gs",
               "width" : 1632
            }
         ],
         "price_level" : 2,
         "rating" : 3.80,
         "reference" : "CoQBcgAAAI_28BshREfmXJ9UKzOLLalhpRaqcW-Wupk1-D2sgkU6ZNe1nsR0zXopB5E-_BGXO1gHxJ1IAe0l-GXzrXj9Dz31crwQ-iwNFLcBRKSGnLmEu_AgKCkfDVZIsgeGrXLNxWLOZ_U8WAZzJu5Uc9tHa9LUF2Rj1MPk9vroGcFjLGWMEhCynlHHTt_P0EZ4wSwwfsumGhQAkqN53-D4ZNjBPEr7qJXZAZMdDg",
         "types" : [ "cafe", "restaurant", "food", "establishment" ],
         "vicinity" : "Harbourside Shopping Centre,Darling Harbour/227 & 229-230 Darling Drive, Sydney"
      },

当我尝试映射照片时，问题类型

我有NSManagedObject类照片

@interface Photo : NSManagedObject

@property (nonatomic, retain) NSNumber * height;
@property (nonatomic, retain) NSNumber * width;
@property (nonatomic, retain) NSString * photo_reference;
@property (nonatomic, retain) NSSet *html_attributions;
@property (nonatomic, retain) Place *place;
@end

我尝试通过以下方式映射：

 RKEntityMapping* photosMapping = [RKEntityMapping mappingForEntityForName:NSStringFromClass([Photo class]) inManagedObjectStore:objectManager.managedObjectStore];

    [photosMapping addAttributeMappingsFromArray:@[@"height",@"photo_reference",@"html_attributions",@"width"]];

    //Add relationship between place and photos
    [placeMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"photos"
                                                                              toKeyPath:@"photos"
                                                                               withMapping:photosMapping]];

但有异常或价值是照片是零我可以如何映射照片和类型任何帮助

Answer 1

你有两个不使用KVC密钥路径的对象数组，＆＃34; html_attributions＆＃34;和＃34;类型。＆＃34;有关在此类情况下进行映射的详细信息，请参阅此RestKit文章：Mapping values without key paths

但是 - 如果您可以控制JSON结构，我建议创建两个新的Objective C类，可能名为HtmlAttribution和Type，每个类都有一个属性，为这些类创建映射并设置RestKit中的relationships。如果你能做到这一点并改变你的JSON如何通过，它将为你大大简化。

这些类（片段）的可能的新JSON结构：

 "html_attributions" : [ {"attribution_data":"\u003ca
           href=\"https://plus.google.com/105663944571\u003c/a\u003e"} ],

 "types" : [ {"type_name":"cafe"}, {"type_name":"restaurant"}, 
             {"type_name":"food"}, {"type_name":"establishment"} ],

在RestKIt .20中将数组映射到核心数据

1 个答案: