Reskit POST操作无法正常工作（错误1016）

Question

我试图用Django-Tastypie创建的REST API绑定RestKit。 GET操作正常，但POST操作有奇怪的行为：在数据库上创建一行，但所有字段都为空。

我已经在版本0.20.3-dev

这里RestKit是我的代码（从here直接复制）：

RKObjectMapping *responseMapping = [RKObjectMapping mappingForClass:[User class]]; 
[responseMapping addAttributeMappingsFromArray:@[@"pseudo", @"email", @"password"]]; 
NSIndexSet *statusCodes = RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful); // Anything in 2xx 
RKResponseDescriptor *userDescriptor2 = [RKResponseDescriptor responseDescriptorWithMapping:responseMapping pathPattern:@"/user" keyPath:@"objects" statusCodes:statusCodes]; 

RKObjectMapping *requestMapping = [RKObjectMapping requestMapping]; // objectClass == NSMutableDictionary 
[requestMapping addAttributeMappingsFromArray:@[@"pseudo", @"email", @"password"]]; 

RKRequestDescriptor *requestDescriptor = [RKRequestDescriptor requestDescriptorWithMapping:requestMapping objectClass:[User class] rootKeyPath:@"objects"]; 

RKObjectManager *manager = [RKObjectManager managerWithBaseURL:[NSURL URLWithString:@"http://127.0.0.1:8000"]]; 
[manager addRequestDescriptor:requestDescriptor]; 
[manager addResponseDescriptor:userDescriptor2]; 

// Tastypie error without this line 
manager.requestSerializationMIMEType = RKMIMETypeJSON; 

// This line changes nothing 
[manager setAcceptHeaderWithMIMEType:RKMIMETypeJSON]; 

User *user = [User new]; 
user.pseudo = @"test"; 
user.email = @"test@gmail.com"; 
user.password = @"test"; 

[manager postObject:user path:@"/api/v1/user/" parameters:nil success:nil failure:nil]; 

这是我得到的错误：

2013-06-29 02:18:21.882 test_restkit[40395:c07] I restkit:RKLog.m:34 RestKit logging initialized... 2013-06-29 02:18:21.930 test_restkit[40395:c07] I restkit.network:RKObjectRequestOperation.m:180 GET 'http://127.0.0.1:8000/api/v1/post/' 2013-06-29 02:18:21.930 test_restkit[40395:c07] I restkit.network:RKObjectRequestOperation.m:180 POST 'http://127.0.0.1:8000/api/v1/user/' 2013-06-29 02:18:21.965 test_restkit[40395:4c03] E restkit.network:RKObjectRequestOperation.m:576 Object request failed: Underlying HTTP request operation failed with error: Error Domain=org.restkit.RestKit.ErrorDomain Code=-1016 "Expected content type {(
    "application/x-www-form-urlencoded", 
    "application/json")}, got text/html" UserInfo=0xa8437b0 {AFNetworkingOperationFailingURLRequestErrorKey=<NSMutableURLRequest http://127.0.0.1:8000/api/v1/user/>, NSErrorFailingURLKey=http://127.0.0.1:8000/api/v1/user/, NSLocalizedDescription=Expected content type {(
    "application/x-www-form-urlencoded", 
    "application/json")}, got text/html, AFNetworkingOperationFailingURLResponseErrorKey=<NSHTTPURLResponse: 0x95866b0>} 2013-06-29 02:18:21.966 test_restkit[40395:4c03] E restkit.network:RKObjectRequestOperation.m:243 POST 'http://127.0.0.1:8000/api/v1/user/' (201 Created/0 objects) [request=0.0304s mapping=0.0000s total=0.0402s]: Error Domain=org.restkit.RestKit.ErrorDomain Code=-1016 "Expected content type {(
    "application/x-www-form-urlencoded", 
    "application/json")}, got text/html" UserInfo=0xa8437b0 {AFNetworkingOperationFailingURLRequestErrorKey=<NSMutableURLRequest http://127.0.0.1:8000/api/v1/user/>, NSErrorFailingURLKey=http://127.0.0.1:8000/api/v1/user/, NSLocalizedDescription=Expected content type {(
    "application/x-www-form-urlencoded", 
    "application/json")}, got text/html, AFNetworkingOperationFailingURLResponseErrorKey=<NSHTTPURLResponse: 0x95866b0>} 2013-06-29 02:18:22.023 test_restkit[40395:1703] I restkit.network:RKObjectRequestOperation.m:250 GET 'http://127.0.0.1:8000/api/v1/post/' (200 OK/4 objects) [request=0.0816s mapping=0.0109s total=0.1023s] 

有人已经面临这种问题？

Thx寻求帮助。

编辑：

这里的很多记录与跟踪记录实现：

2013-06-29 13:03:28.554 test_restkit[42627:c07] D restkit.object_mapping:RKMappingOperation.m:1021 Finished mapping operation successfully... 
2013-06-29 13:03:28.562 test_restkit[42627:c07] T restkit.network:RKObjectRequestOperation.m:178 POST 'http://127.0.0.1:8000/api/v1/user/': 
request.headers={ 
    Accept = "application/json"; 
    "Accept-Language" = "en;q=1, fr;q=0.9, de;q=0.8, ja;q=0.7, nl;q=0.6, it;q=0.5"; 
    "Content-Type" = "application/json; charset=utf-8"; 
    "User-Agent" = "test_restkit/1.0 (iPad Simulator; iOS 6.1; Scale/1.00)"; 
} 
request.body={"objects":{"password":"test","pseudo":"test","email":"test@gmail.com"}} 

编辑2：

通过编辑这一行：

RKRequestDescriptor *requestDescriptor = [RKRequestDescriptor requestDescriptorWithMapping:requestMapping objectClass:[User class] rootKeyPath:@"objects"]; 

by

RKRequestDescriptor *requestDescriptor = [RKRequestDescriptor requestDescriptorWithMapping:requestMapping objectClass:[User class] rootKeyPath:nil]; 

行被创建并且字段被正确填充。但我仍然得到内容类型错误

Answer 1

错误只是告诉RestKit希望接收JSON，但服务器不发送JSON（或至少不设置正确的标头）。解决此问题的最佳方法是更改​​服务器响应中的标头，使其返回JSON。或者，告诉RestKit不要期望收到JSON。