我正在创建一个具有离线模式的任务应用程序。我几乎使用RestKit成功创建了在线模式。
在离线模式下，我为每个对象设置isSync属性为false，这样当网络可用时，我可以使用谓词获取这些未同步的对象并将它们发送到服务器。
不幸的是，我无法使用RestKit一次性找到POST这些对象数组到服务器的方法。
RestKit是否支持此功能？或者有没有更好的方法来使用RestKit实现离线支持？
更新
我找到了一种方法here，创建一个中间Entity（有自己的映射），其属性为NSArray，可以POST到服务器。
但我有许多需要离线功能的实体（笔记，任务，评论......等），我是否必须为每个原始实体创建一个额外的中间实体？ （这样每个人的响应都可以在我原来的实体中正确映射）
更新2：
访问here后，我发现在RestKit 0.20.0中支持POST支持多个对象的数组。但是每当我有POST一个对象数组时，就没有参数发送到服务器。这就是我在做的事情：
[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);
}];
}
}
以下是映射：
- (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但使用调用inverseMapping方法。
现在我用数组调用postObject：
[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);
}
}];
几乎以前的方法：
+ (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);
}];
}
申请已终止
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？
答案 0 :(得分：1)
问题与发送阵列无关，这是由于您的核心数据堆栈设置。你的两个案件之间有很大的不同。工作的那个使用魔法记录的默认上下文。不使用对象管理器及其关联对象存储的那个 - 似乎没有配置。
从代码和错误中，发布没有附件的单个任务也应该失败。
检查核心数据堆栈的创建以及与对象管理器的关联。