ios - 使用 RestKit 将 JSON "Associative array"映射到 CoreData

Question

我需要使用 RestKit(iOS) 映射 JSON 对象关联数组。它看起来像具有属性 135,145,423 的对象以及其上的对象。

{
  "135": {
    "name" : "Object1",
    "property1" : "Value1",
    "anotherProperty1" : "Value2"
  },
  "145": {
    "name": "Object2",
    "property1" : "Value1",
    "anotherProperty1" : "Value2"
  },
  "423": {
    "name": "Object3",
    "property1" : "Value1",
    "anotherProperty1" : "Value2"
  }
}

我已经获得了有效的单个对象的映射。映射执行到 CoreData。我唯一的解决方案是将关联数组转换为普通数组并将数字放入“id”字段，但我认为这不是一个优雅的解决方案。

有没有正确的方法可以直接使用 RestKit 执行此类映射？

Answer 1

这是针对我的情况的解决方案。

NSIndexSet *statusCodes = RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful); // Anything in 2xx

// 1. Create dynamic mapping
RKDynamicMapping* dynamicMapping = [[RKDynamicMapping alloc] init];
// 2. Process every entry separately
dynamicMapping.forceCollectionMapping = YES;

// 3. Set mappings for every object
[dynamicMapping setObjectMappingForRepresentationBlock:^RKObjectMapping *(id representation) {
    // 4. Mapping to Core Data (Can be replaced with RKObjectMapping if there's no need of CodeData)
    RKEntityMapping *singleRouteMapping = [RKEntityMapping mappingForEntityForName:@"Object" inManagedObjectStore:managedObjectStore];
    // 5. Walking through all keys (but with dynamicMapping.forceCollectionMapping = YES) there'll be only one. It's better to refactor it.
    for (NSString *key in representation) {
        // 6. Set mappings for every property exect 'id'
        [singleRouteMapping addAttributeMappingsFromDictionary:@{
         [NSString stringWithFormat: @"%@.name", key]: @"name",
         [NSString stringWithFormat: @"%@.property1", key]: @"property1",
         [NSString stringWithFormat: @"%@.anotherProperty1", key]: @"anotherProperty1"
         }];
    }
    // 7. Map 'id' property at last
    [singleRouteMapping addAttributeMappingFromKeyOfRepresentationToAttribute: @"id"];

    return singleRouteMapping;
}];

RKResponseDescriptor *pluralDescriptor = [RKResponseDescriptor responseDescriptorWithMapping: dynamicMapping
    pathPattern: @"/api/objects"
    keyPath: nil
    statusCodes: statusCodes];

NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.somesite.com/api/objects"]];
RKManagedObjectRequestOperation *operation = [[RKManagedObjectRequestOperation alloc] initWithRequest:request responseDescriptors:@[pluralDescriptor]];