使用RestKit进行外键关系映射 [英] Foreign key relationship mapping with RestKit

问题描述

我对RestKit完全不熟悉并且在某种程度上挣扎。

I'm totally new to RestKit and am struggling somewhat.

JSON：

{
    "teams": [
        {
            "id": 1,
            "name": "Team A"
        },
        {
            "id": 2,
            "name": "Team B"
        }
    ],
    "users": [
        {
            "id": 1,
            "name": "cameron",
            "teamId": 1
        },
        {
            "id": 2,
            "name": "paul",
            "teamId": 2
        }
    ]
}

CoreData：

@interface Team : NSManagedObject
@property (nonatomic, retain) NSNumber * teamId;
@property (nonatomic, retain) NSString * name;
@end




@interface User : NSManagedObject
@property (nonatomic, retain) NSNumber * userId;
@property (nonatomic, retain) NSString * name;
@property (nonatomic, retain) Team * team;
@end

我的应用程序逻辑如下所示：

My application logic looks like this:

// team mapping
RKEntityMapping *teamMapping = [RKEntityMapping mappingForEntityForName:@"Team" inManagedObjectStore:[RKManagedObjectStore defaultStore]];
teamMapping.identificationAttributes = @[@"teamId"];
[teamMapping addAttributeMappingsFromDictionary:@{
 @"id": @"teamId",
 @"name": @"name"
 }];


// Register our mappings with the provider
RKResponseDescriptor *teamResponseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:teamMapping
                                                                                   pathPattern:nil
                                                                                       keyPath:@"teams"
                                                                                   statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];
[self.objectManager addResponseDescriptor:teamResponseDescriptor];



// user mapping
RKEntityMapping *userMapping = [RKEntityMapping mappingForEntityForName:@"User" inManagedObjectStore:[RKManagedObjectStore defaultStore]];
userMapping.identificationAttributes = @[@"userId"];
[userMapping addAttributeMappingsFromDictionary:@{
 @"id": @"userId",
 @"name": @"name"
 }];


// Register our mappings with the provider
RKResponseDescriptor *userResponseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:userMapping
                                                                                   pathPattern:nil
                                                                                       keyPath:@"users"
                                                                                   statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];
[self.objectManager addResponseDescriptor:userResponseDescriptor];

我不能为我的生活找出如何让RestKit填充团队的财产用户对象。

I can't for the life of me work out how to get RestKit to populate the team Property of the user objects.

我看了很多帖子，但我尝试的都没有，这不是一般的用例吗？

I've look at so many posts but nothing I try works, is this not a usual use case?

有谁知道怎么做，非常感谢帮助！

Does anyone know how to do this, help would be very appreciated!

谢谢。

推荐答案

您需要在用户实体中添加一个瞬态属性，该实体包含相关的 teamId 。这需要添加到您的 userMapping 。

You need to add a transient attribute to your User entity which holds the associated teamId. This needs to be added to your userMapping.

然后，您需要为<$添加关系定义c $ c> userMapping ：

[userMapping addConnectionForRelationship:@"team" connectedBy:@{ @"teamId": @"teamId" }];

这为RestKit提供了建立连接所需的信息，并指示它作为连接的一部分进行连接映射操作。

This gives RestKit the information it needs to make the connection and instructs it to make the connection as part of the mapping operation.

这篇关于使用RestKit进行外键关系映射的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！