RestKit EntityMapping 与嵌套数组

Question

我的 JSON 响应的实体映射部分存在问题。

我尝试在我的核心数据模型中为成分创建一个单独的实体，并将 mappingForEntityName 设置为 @"Ingredients"，但无济于事。在我的 Dish Core Data 实体模型中，我声明了 @"ingredientValue"、@"ingredientName" 等，但是在查看我的 .sqlite 文件时，它不会填充成分字段。

RestKit 不会向我抛出任何错误。所以我怀疑它与存储在数组中的成分有关？

如您所见，我已经声明了 2 个 RKEntityMapping 实例（我不知道这是否是正确的做法？）。但我的原料没有退回。

JSON 看起来像这样：

{ dishes: [
 {
    id: 34,
    name: "Pavlova med citroncreme og jordbær",
    header: "En laekker marengs kage til enhver lejlighed",
    howto: "lots of text....",
    image: "/img_path/img.jpg",
    created_at: "2014-04-05T00:25:22.378Z",
    ingredients: [
                    {
                       ingredient_id: 27,
                       ingredient_amount: 3,
                       ingredient_unit: "stk",
                       ingredient_name: "æggehvider"
                     },
                     {
                       ingredient_id: 28,
                       ingredient_amount: 2,
                       ingredient_unit: "dl",
                       ingredient_name: "sukker"
                     }
                 ]
    }
]}

Dish.h：

@interface Dish : NSManagedObject


@property (nonatomic, copy) NSString *dishName;
@property (nonatomic, copy) NSString *dishHeader;
@property (nonatomic, copy) NSString *dishImage;
@property (nonatomic, copy) NSString *dishIngredients;
@property (nonatomic) NSInteger dishID;
@property (nonatomic, copy) NSData *dishMainText;
@property (nonatomic) NSDate *createdAt;

//Ingredients
@property (nonatomic, copy) NSString *ingredientName;
@property (nonatomic, copy) NSString *ingredientUnit;
@property (nonatomic) NSInteger ingredientValue;
@property (nonatomic) NSInteger ingredientID;
@end

菜.m：

RKEntityMapping *dishMapping = [RKEntityMapping mappingForEntityForName:@"Dish" inManagedObjectStore:managedObjectStore];
    [dishMapping addAttributeMappingsFromDictionary:@{
                                                    @"id":          @"dishID",
                                                    @"name":        @"dishName",
                                                    @"header":      @"dishHeader",
                                                    @"howto":       @"dishMainText",
                                                    @"image":       @"dishImage",
                                                    @"created_at":   @"createdAt"}];


    dishMapping.identificationAttributes = @[ @"dishID" ];

    RKEntityMapping *ingredientMapping = [RKEntityMapping mappingForEntityForName:@"Dish" inManagedObjectStore:managedObjectStore];
    [ingredientMapping addAttributeMappingsFromDictionary:@{
                                                    @"ingredient_amount": @"ingredientValue",
                                                    @"ingredient_unit": @"ingredientUnit",
                                                    @"ingredient_name": @"ingredientName"}];

    [dishMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"dishes" toKeyPath:@"dishes" withMapping:ingredientMapping]];


    RKResponseDescriptor *responseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:dishMapping
                                                                                            method:RKRequestMethodGET
                                                                                       pathPattern:@"/dishes.json"
                                                                                           keyPath:@"dishes"
                                                                                       statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];

EDIT为RKLogConfigureByName("RestKit/ObjectMapping", RKLogLevelTrace)添加了部分日志输出

with mapping <RKEntityMapping:0x8f69750 objectClass=NSManagedObject propertyMappings=(
    "<RKAttributeMapping: 0x8f6c150 name => dishName>",
    "<RKAttributeMapping: 0x8f6c190 id => dishID>",
    "<RKAttributeMapping: 0x8f6c480 header => dishHeader>",
    "<RKAttributeMapping: 0x8f6c4a0 howto => dishMainText>",
    "<RKAttributeMapping: 0x8f6c520 image => dishImage>",
    "<RKAttributeMapping: 0x8f6c5c0 created_at => createdAt>",
    "<RKRelationshipMapping: 0x8f6d8e0 dishes => dishes>"

Answer 1

我没有看到您的 Dish 实体中定义了 dishes。它应该是与Ingredient 的一对多关系。

ingredientMapping 应该使用Ingredient 实体。

在您调用dishMapping addPropertyMapping:... 的地方，您应该使用...FromKeyPath:@"ingredients" ... 来匹配传入的JSON 中的键名。