Question

我正在使用RestKit将以下JSON映射到核心数据。

这是我的模特： enter image description here

这是我的方法：

 RKEntityMapping *userMapping = [RKEntityMapping mappingForEntityForName:NSStringFromClass([User class]) inManagedObjectStore:managedObjectStore];
    userMapping.identificationAttributes = @[@"id"];
    [userMapping addAttributeMappingsFromDictionary:@{
                                                         @"birthday":@"birthday",
                                                         @"email":@"email",
                                                         @"facebook_token":@"facebook_token",
                                                         @"first_name":@"first_name",
                                                         @"gender":@"gender",
                                                         @"interested_in":@"interested_in",
                                                         @"last_name":@"last_name",
                                                         @"password":@"password",
                                                         @"m8_status":@"m8_status",
                                                         @"status":@"status",
                                                         @"languages": @"languages",
                                                         @"hometown":@"hometown",
                                                         @"location":@"location",
                                                         @"avatar_url":@"avatar_url",
                                                         @"mood":@"mood"
                                                         }];
 RKEntityMapping *findUserMapping = [RKEntityMapping mappingForEntityForName:NSStringFromClass([FindUser class]) inManagedObjectStore:managedObjectStore];
    findUserMapping.identificationAttributes = @[@"id"];
    [findUserMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"users" toKeyPath:@"users" withMapping:userMapping]];

  [manager addResponseDescriptorsFromArray:@[



                                               [RKResponseDescriptor responseDescriptorWithMapping:findUserMapping
                                                                                       pathPattern:@"/v1/users"
                                                                                           keyPath:nil                                                                                      statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)]

                                               ]];

这是从JSON示例获取对象：

{
"users": [
{
"avatar_url": null,
"birthday": "04/11/1984",
"email": "antonina.duminskaya@wildermancruickshank.co.uk", "first_name": "Antonina",
"gender": "female",
"hometown": null,
"id": "5264ee384d61632c4b2f0000",
"interested_in": [
"male",
"female" ],
"languages": [], "last_name": "Duminskaya", "location": null, "m8_status": null,
"mood": null,
"status": null
} ]
}

这里：

 [objectManager getObjectsAtPath:@"/v1/users" parameters:@{@"session_id":session.id} success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
           FindUser *findUsers = [[self.fetchedFindUsersResultsController fetchedObjects] lastObject];
            NSLog(@"%@", findUsers.users);


       } failure:^(RKObjectRequestOperation *operation, NSError *error) {

       }];

我在日志中有消息：

Relationship 'users' fault on managed object (0x8e964a0) <FindUser: 0x8e964a0> (entity: FindUser; id: 0x8da0790 <x-coredata://083BB731-FDD7-4A35-A174-724F50862A02/FindUser/p1> ; data: {
    id = nil;
    users = "<relationship fault: 0x8deb260 'users'>";
})

在mappingResults中，我得到了关于json的所有结果

Answer 1

核心数据最初通过不加载所有对象图表来表示最初为故障保存内存的关系。

https://developer.apple.com/library/ios/documentation/cocoa/conceptual/CoreData/Articles/cdFaultingUniquing.html

此外，请勿使用保留字“id”作为托管对象的Restkit标识属性。尝试使用findUserId和userId并相应地更新映射。

RestKit核心数据映射一对多

1 个答案: