Question

我发出了一个获取带有嵌套数据数组的对象的请求。但是，RestKit仅保存嵌套数据数组中的最后一项。

例如，这是服务器正在发送的JSON响应

{
    "nutrition_day": {
        "id": "5342e9e13138610012420100",
        "start_on": "2014-04-07",
        "meal_goals": [
            {
                "id": "5342e9e13138610012410100",
                "name": "Breakfast",
                "food_entries": [
                    {
                        "id": "535429513663320008210000",
                        "consumed_on": "2014-04-20",
                        "food_id": 33801,
                        "serving_id": 29457,
                    }
                ]
            },
            {
                "id": "5342e9e13138610012430100",
                "name": "Morning Snack",
                "food_entries": []
            }
        ]
    }
}

但是，使用下面的代码，当我尝试访问nutrition_data.meal_goals时，我只剩下数组中的最后一项“Morning Snack”而我没有得到“早餐”

映射：

+ (void)mapping
{
    RKObjectMapping *requestMapping = [RKObjectMapping requestMapping];
    RKEntityMapping *responseMapping = [RKEntityMapping mappingForEntityForName:@"NutritionDay" inManagedObjectStore:[[RKObjectManager sharedManager] managedObjectStore]];

    [requestMapping addAttributeMappingsFromArray:@[@"date"]];

    [responseMapping addAttributeMappingsFromArray:@[@"start_on", @"protein_target"]];
    [responseMapping setIdentificationAttributes:@[@"start_on"]];
    [responseMapping addRelationshipMappingWithSourceKeyPath:@"meal_goals" mapping:[MealGoal responseMapping]];

    RKRequestDescriptor *requestDescriptor = [RKRequestDescriptor requestDescriptorWithMapping:requestMapping
                                                                                   objectClass:[NutritionDay class]
                                                                                   rootKeyPath:@"nutrition_day"
                                                                                        method:RKRequestMethodGET];

    RKResponseDescriptor *responseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:responseMapping
                                                                                            method:RKRequestMethodAny
                                                                                       pathPattern:@"nutrition/days/:date"
                                                                                           keyPath:@"nutrition_day"
                                                                                       statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];

    [[RKObjectManager sharedManager] addRequestDescriptor:requestDescriptor];
    [[RKObjectManager sharedManager] addResponseDescriptor:responseDescriptor];
}

请求：

[[RKObjectManager sharedManager] getObjectsAtPath:@"nutrition/days/2014-12-12" parameters:nil success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
    NutritionDay *nut = ((NutritionDay *)mappingResult.firstObject);
    NSLog(@"%lu", (long)nut.meal_goals.count); // this always returns 1 when it should be 2
} failure:^(RKObjectRequestOperation *operation, NSError *error) {
    NSLog(@"fail");
}];

我是否需要做些什么来让RestKit识别整个关系并保存它？

Answer 1

我建议您在映射中包含id，并将其用作标识属性。

meal_goals应该是一个多对多的关系（反向）。

您的日志应为：

NSLog(@"%lu", (long)nut.meal_goals.count);

除了那些东西，你展示的代码看起来是正确的。记录整个映射结果以验证内容。

RestKit仅保存响应数组中的最后一项

1 个答案: