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ios - RestKit 0.20 - POST 多个对象

转载 作者：塔克拉玛干 更新时间：2023-11-02 21:23:36 25 4
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我正在创建一个具有离线模式的任务应用程序。我几乎已经使用 RestKit 成功创建了在线模式。

在离线模式下，我将每个对象的 isSync 属性设置为 false，这样当网络可用时，我可以使用 predicate 获取这些未同步的对象并发布它们到服务器。

不幸的是，我找不到使用 RestKit 一次性将这些对象的数组POST 到服务器的方法。

RestKit 支持吗？或者有没有更好的方法使用 RestKit 实现离线支持？

更新:

我找到了一个方法here ，创建具有 NSArray 属性的中间 Entity(具有自己的映射)，可以将其发布到服务器。

但是我有很多实体(笔记、任务、评论等)需要离线功能，我是否必须为每个原始实体创建一个额外的中间实体？ (这样每个响应都可以在我的原始实体中正确映射)

更新 2:

访问后here ，我发现 RestKit 0.20.0 现在支持 POSTing 多个对象的数组。但是每当我发布一个对象数组时，都不会向服务器发送任何参数。我就是这样做的:

[DBTasks createTask:task attachments:nil completionHandler:^(DBTasks *task, NSError *error) {
            isPosting = NO;
            [self setLoadingState:NO];
            if (!error) {
                KLog(@"task is %@", task); // works perfect
                [self.tasksArray insertObject:task atIndex:0];
                [self reloadTasks];

            } else {
                KLog(@"error %@", error);
            }
        }];

这是我实际发送 POST 请求的方法:

(只考虑else部分)

+ (void)createTask:(DBTasks *)task attachments:(NSArray *)attachments completionHandler:(void (^)(DBTasks *, NSError *))completionHandler {

    if (attachments != nil && attachments.count > 0) {
        NSMutableURLRequest *request =[[RKObjectManager sharedManager] multipartFormRequestWithObject:task
                                                                                               method:RKRequestMethodPOST
                                                                                                 path:URL_TASKS
                                                                                           parameters:@{@"total_attachments": [NSNumber numberWithInt:attachments.count]}
                                                                            constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {

                                                                                int counter = 0;
                                                                                for (NSDictionary *dic in attachments) {
                                                                                    [formData appendPartWithFileData:UIImageJPEGRepresentation([dic objectForKey:@"image"], 0.7)
                                                                                                                name:[NSString stringWithFormat:@"attachment[%i]", counter]
                                                                                                            fileName:[dic objectForKey:@"name"]
                                                                                                            mimeType:@"image/jpg"];

                                                                                    counter++;
                                                                                }
                                                                            }];

        RKObjectRequestOperation *operation = [[RKObjectManager sharedManager] managedObjectRequestOperationWithRequest:request
                                                                                                   managedObjectContext:[NSManagedObjectContext MR_defaultContext]
                                                                                                                success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
                                                                                                                    KLog(@"success");
                                                                                                                    completionHandler((DBTasks *)[mappingResult firstObject], nil);

                                                                                                                } failure:^(RKObjectRequestOperation *operation, NSError *error) {
                                                                                                                    KLog(@"fail");
                                                                                                                    completionHandler(nil, error);
                                                                                                                }];
        [operation start];

    }

    // without attachment
    else {
        [[RKObjectManager sharedManager] postObject:task path:URL_TASKS parameters:nil
                                            success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
                                                completionHandler((DBTasks *)[mappingResult firstObject], nil);
                                            }
                                            failure:^(RKObjectRequestOperation *operation, NSError *error) {
                                                completionHandler(nil, error);
                                            }];
    }
}

映射如下:

- (RKEntityMapping *)tasksMapping {

    RKEntityMapping *tasksMapping = [RKEntityMapping mappingForEntityForName:@"DBTasks" inManagedObjectStore:objectManager.managedObjectStore];
    tasksMapping.setDefaultValueForMissingAttributes = NO;
    tasksMapping.deletionPredicate = [NSPredicate predicateWithFormat:@"shouldBeDeleted = 1"];
    [tasksMapping setModificationAttributeForName:@"updated_at"];
    tasksMapping.identificationAttributes = @[@"id"];

    [tasksMapping addAttributeMappingsFromArray:@[@"completed_at", @"created_at", @"due_date", @"id", @"note", @"private", @"send_email", @"status", @"title", @"type", @"updated_at", @"user_id", @"parent_id", @"total_attachments", @"url", @"from", @"total_comments"]];

    [tasksMapping addAttributeMappingsFromDictionary:@{@"deleted": @"shouldBeDeleted"}];


    [tasksMapping addRelationshipMappingWithSourceKeyPath:@"attachments" mapping:[self attachmentsMapping]];
    [tasksMapping addRelationshipMappingWithSourceKeyPath:@"owner" mapping:[self contactsMapping]];
    [tasksMapping addRelationshipMappingWithSourceKeyPath:@"additional_owners" mapping:[self contactsMapping]];
    [tasksMapping addRelationshipMappingWithSourceKeyPath:@"tags" mapping:[self tagsMapping]];

    return tasksMapping;
}

相同的映射用于 POST/PUT/DELETE，但调用 inverseMapping 方法。

现在，当我用数组调用 postObject 时:

[DBTasks createTasks:[NSArray arrayWithObjects:task, task, nil] attachments:nil completionHandler:^(NSArray *array, NSError *error) {
            isPosting = NO;
            [self setLoadingState:NO];
            if (!error) {
                KLog(@"Array of objects is %@", array);
                [self.tasksArray insertObject:task atIndex:0];
                [self reloadTasks];

            } else {
                KLog(@"error %@", error);
            }
        }];

与之前的方法差不多:

+ (void)createTasks:(NSArray *)tasksArray attachments:(NSArray *)attachments completionHandler:(void (^)(NSArray *, NSError *))completionHandler {
    [[RKObjectManager sharedManager] postObject:tasksArray path:URL_TASKS parameters:nil
                                        success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
                                            completionHandler(mappingResult.array, nil);
                                        }
                                        failure:^(RKObjectRequestOperation *operation, NSError *error) {
                                            completionHandler(nil, error);
                                        }];
}

应用终止

2014-05-05 16:18:30.692 MyApp[8195:f03] D restkit.object_mapping:RKMapperOperation.m:377 Executing mapping operation for representation: (
        {
        attachments =         (
        );
        "completed_at" = "<null>";
        "created_at" = "<null>";
        deleted = 0;
        "due_date" = "<null>";
        from = "Stand-alone task";
        id = "<null>";
        note = "<null>";
        owner = "<null>";
        private = 0;
        "send_email" = "<null>";
        status = "<null>";
        tags =         (
        );
        title = "<null>";
        "total_attachments" = 0;
        "total_comments" = 0;
        type = Task;
        "updated_at" = "<null>";
        url = "http://10.28.79.98:3000/workspace/tasks?open=task_";
        "user_id" = 26894;
    }
)
 and targetObject: (null)
2014-05-05 16:18:30.693 MyApp[8195:f03] D restkit.object_mapping:RKMapperOperation.m:297 Found mappable collection at keyPath '': (
        {
        attachments =         (
        );
        "completed_at" = "<null>";
        "created_at" = "<null>";
        deleted = 0;
        "due_date" = "<null>";
        from = "Stand-alone task";
        id = "<null>";
        note = "<null>";
        owner = "<null>";
        private = 0;
        "send_email" = "<null>";
        status = "<null>";
        tags =         (
        );
        title = "<null>";
        "total_attachments" = 0;
        "total_comments" = 0;
        type = Task;
        "updated_at" = "<null>";
        url = "http://10.28.79.98:3000/workspace/tasks?open=task_";
        "user_id" = 26894;
    }
)
2014-05-05 16:18:30.694 MyApp[8195:f03] CoreData: error: Failed to call designated initializer on NSManagedObject class 'DBTasks' 
2014-05-05 16:18:30.694 MyApp[8195:f03] D restkit.object_mapping:RKMapperOperation.m:231 Asked to map source object {
    attachments =     (
    );
    "completed_at" = "<null>";
    "created_at" = "<null>";
    deleted = 0;
    "due_date" = "<null>";
    from = "Stand-alone task";
    id = "<null>";
    note = "<null>";
    owner = "<null>";
    private = 0;
    "send_email" = "<null>";
    status = "<null>";
    tags =     (
    );
    title = "<null>";
    "total_attachments" = 0;
    "total_comments" = 0;
    type = Task;
    "updated_at" = "<null>";
    url = "http://10.28.79.98:3000/workspace/tasks?open=task_";
    "user_id" = 26894;
} with mapping <RKEntityMapping:0x10598240 objectClass=DBTasks propertyMappings=(
    "<RKAttributeMapping: 0x10599660 completed_at => completed_at>",
    "<RKAttributeMapping: 0x10599670 created_at => created_at>",
    "<RKAttributeMapping: 0x10599680 due_date => due_date>",
    "<RKAttributeMapping: 0x10599690 id => id>",
    "<RKAttributeMapping: 0x105996a0 note => note>",
    "<RKAttributeMapping: 0x105996b0 private => private>",
    "<RKAttributeMapping: 0x105996c0 send_email => send_email>",
    "<RKAttributeMapping: 0x105996d0 status => status>",
    "<RKAttributeMapping: 0x105996e0 title => title>",
    "<RKAttributeMapping: 0x105996f0 type => type>",
    "<RKAttributeMapping: 0x10599700 updated_at => updated_at>",
    "<RKAttributeMapping: 0x10599710 user_id => user_id>",
    "<RKAttributeMapping: 0x10599720 parent_id => parent_id>",
    "<RKAttributeMapping: 0x10599730 total_attachments => total_attachments>",
    "<RKAttributeMapping: 0x10599740 url => url>",
    "<RKAttributeMapping: 0x10599750 from => from>",
    "<RKAttributeMapping: 0x10599760 total_comments => total_comments>",
    "<RKAttributeMapping: 0x10599870 deleted => shouldBeDeleted>",
    "<RKRelationshipMapping: 0x1059b1c0 attachments => attachments>",
    "<RKRelationshipMapping: 0x1059c5f0 owner => owner>",
    "<RKRelationshipMapping: 0x1059dca0 additional_owners => additional_owners>",
    "<RKRelationshipMapping: 0x105a1e00 tags => tags>"
)>
2014-05-05 16:18:30.695 MyApp[8195:f03] D restkit.object_mapping:RKMappingOperation.m:952 Starting mapping operation...
2014-05-05 16:18:30.696 MyApp[8195:340b] D restkit.object_mapping:RKPropertyInspector.m:130 Cached property inspection for Class 'DBTasks': {
    "additional_owners" =     {
        isPrimitive = 0;
        keyValueCodingClass = NSSet;
        name = "additional_owners";
    };
    attachments =     {
        isPrimitive = 0;
        keyValueCodingClass = NSSet;
        name = attachments;
    };
    "completed_at" =     {
        isPrimitive = 0;
        keyValueCodingClass = NSDate;
        name = "completed_at";
    };
    "created_at" =     {
        isPrimitive = 0;
        keyValueCodingClass = NSDate;
        name = "created_at";
    };
    "due_date" =     {
        isPrimitive = 0;
        keyValueCodingClass = NSDate;
        name = "due_date";
    };
    from =     {
        isPrimitive = 0;
        keyValueCodingClass = NSString;
        name = from;
    };
    id =     {
        isPrimitive = 0;
        keyValueCodingClass = NSNumber;
        name = id;
    };
    note =     {
        isPrimitive = 0;
        keyValueCodingClass = NSString;
        name = note;
    };
    owner =     {
        isPrimitive = 0;
        keyValueCodingClass = DBContacts;
        name = owner;
    };
    "parent_id" =     {
        isPrimitive = 0;
        keyValueCodingClass = NSNumber;
        name = "parent_id";
    };
    private =     {
        isPrimitive = 0;
        keyValueCodingClass = NSNumber;
        name = private;
    };
    "send_email" =     {
        isPrimitive = 0;
        keyValueCodingClass = NSNumber;
        name = "send_email";
    };
    shouldBeDeleted =     {
        isPrimitive = 0;
        keyValueCodingClass = NSNumber;
        name = shouldBeDeleted;
    };
    status =     {
        isPrimitive = 0;
        keyValueCodingClass = NSNumber;
        name = status;
    };
    tags =     {
        isPrimitive = 0;
        keyValueCodingClass = NSSet;
        name = tags;
    };
    title =     {
        isPrimitive = 0;
        keyValueCodingClass = NSString;
        name = title;
    };
    topic =     {
        isPrimitive = 0;
        keyValueCodingClass = DBTopics;
        name = topic;
    };
    "total_attachments" =     {
        isPrimitive = 0;
        keyValueCodingClass = NSNumber;
        name = "total_attachments";
    };
    "total_comments" =     {
        isPrimitive = 0;
        keyValueCodingClass = NSNumber;
        name = "total_comments";
    };
    type =     {
        isPrimitive = 0;
        keyValueCodingClass = NSString;
        name = type;
    };
    "updated_at" =     {
        isPrimitive = 0;
        keyValueCodingClass = NSDate;
        name = "updated_at";
    };
    url =     {
        isPrimitive = 0;
        keyValueCodingClass = NSString;
        name = url;
    };
    "user_id" =     {
        isPrimitive = 0;
        keyValueCodingClass = NSNumber;
        name = "user_id";
    };
}
2014-05-05 16:18:30.698 MyApp[8195:340b] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** setObjectForKey: key cannot be nil'
*** First throw call stack:
(
    0   CoreFoundation                      0x034721e4 __exceptionPreprocess + 180
    1   libobjc.A.dylib                     0x02be48e5 objc_exception_throw + 44
    2   CoreFoundation                      0x034fbeb8 -[__NSDictionaryM setObject:forKey:] + 888
    3   MyApp                         0x002dad3a __61-[RKPropertyInspector(CoreData) propertyInspectionForEntity:]_block_invoke61 + 154
    4   libdispatch.dylib                   0x04ce17b8 _dispatch_call_block_and_release + 15
    5   libdispatch.dylib                   0x04cf64d0 _dispatch_client_callout + 14
    6   libdispatch.dylib                   0x04ce4047 _dispatch_queue_drain + 452
    7   libdispatch.dylib                   0x04ce3e42 _dispatch_queue_invoke + 128
    8   libdispatch.dylib                   0x04ce4de2 _dispatch_root_queue_drain + 78
    9   libdispatch.dylib                   0x04ce5127 _dispatch_worker_thread2 + 39
    10  libsystem_pthread.dylib             0x05025dab _pthread_wqthread + 336
    11  libsystem_pthread.dylib             0x05029cce start_wqthread + 30
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)

有什么建议我做错了吗？

最佳答案

问题与发送数组无关，这是由于您的核心数据堆栈设置所致。你的两个案例有很大的不同。有效的方法使用魔法记录中的默认上下文。一个不使用对象管理器及其关联的对象存储的对象 - 似乎没有配置。

从代码和报错看，单发任务不带附件应该也会失败。

检查您的核心数据堆栈创建以及与对象管理器的关联。

关于ios - RestKit 0.20 - POST 多个对象，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/23380725/

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