json - 休息套件 : multipartFormRequestWithObject not json

Question

我正在使用 RestKit 2.0 通过“multipartFormRequestWithObject”方法将核心数据实体和图像发送到服务器。但是，当实体数据到达时，它不是 json 格式。如果我使用“postObject”发送没有图像的实体，则数据为 json 格式。我对这两种情况使用相同的 RKObjectMapping。我需要做什么才能使对象序列化为 json？我试过了

[request setValue:@"application/json" forHTTPHeaderField:@"content-type"]; 

但这没有帮助，我已经有了我的对象管理器设置:

[objectManager setRequestSerializationMIMEType:RKMIMETypeJSON];
[objectManager setAcceptHeaderWithMIMEType:RKMIMETypeJSON];

我的标题内容类型是 multipart/form-data 但我想这是必需的。

request.headers={
Accept = "application/json";
"Accept-Language" = "en;q=1, fr;q=0.9, de;q=0.8, zh-Hans;q=0.7, zh-Hant;q=0.6, ja;q=0.5";
"Accept-Version" = 1;
"Content-Length" = 19014;
"Content-Type" = "multipart/form-data; boundary=Boundary+0xAbCdEfGbOuNdArY";
"User-Agent" = "app/1.0 (iPhone Simulator; iOS 7.0; Scale/2.00)";

}

我的完整代码用于映射和操作如下。像往常一样，任何反馈都会很棒。谢谢。铝

- (void)loginMainUser:(NSDictionary*)paramsDict path:(NSString *)apiPath{

RKObjectManager *manager = [RKObjectManager sharedManager];

// Response Mapping
RKObjectMapping *mapping = [RKObjectMapping mappingForClass:[self class]];
[mapping addAttributeMappingsFromDictionary:@{@"token" : @"token",
                                              @"_links" : @"links"}];

[manager addResponseDescriptorsFromArray:@[[RKResponseDescriptor responseDescriptorWithMapping:mapping
                                                                                        method:RKRequestMethodAny
                                                                                   pathPattern:nil
                                                                                       keyPath:nil
                                                                                   statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)]]];
// Request Mapping
RKObjectMapping *userRequestMapping = [RKObjectMapping requestMapping];
[userRequestMapping addAttributeMappingsFromDictionary:@{@"name" : @"first_name",
                                                         @"surname" : @"last_name",
                                                         @"email" : @"email",
                                                         @"password" : @"password"}];

RKRequestDescriptor *requestDescriptor = [RKRequestDescriptor requestDescriptorWithMapping:userRequestMapping
                                                                               objectClass:[self class]
                                                                               rootKeyPath:nil
                                                                                    method:RKRequestMethodAny];
[manager addRequestDescriptor:requestDescriptor];


UIImage *image = [UIImage imageNamed:@"logo.png"];

// Serialize the Article attributes then attach a file
NSMutableURLRequest *request = [manager multipartFormRequestWithObject:self
                                                                method:RKRequestMethodPOST
                                                                  path:apiPath
                                                            parameters:nil
                                             constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
                                                 [formData appendPartWithFileData:UIImagePNGRepresentation(image)
                                                                             name:@"logo"
                                                                         fileName:@"logo.png"
                                                                        mimeType:@"image/png"];
                                                                     }];

RKObjectRequestOperation *operation = [manager objectRequestOperationWithRequest:request
                                                                         success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
                                                                             NSLog(@"Success");
                                                                         } failure:^(RKObjectRequestOperation *operation, NSError *error) {
                                                                             NSLog(@"Failed");
                                                                         }];

[manager enqueueObjectRequestOperation:operation];
}

Answer 1

multipartFormRequestWithObject 明确不是 JSON。这是设计使然。更改的是 HTTP 内容类型，因此 JSON 和多部分形式是互斥的。

因此，您需要改变对想要实现的目标的想法。

一种选择是使用映射操作为您的对象创建 JSON，然后在调用 multipartFormRequestWithObject 时提供该 JSON。这将为您提供一条多部分表单消息，该消息与可以在服务器上反序列化的 JSON 部分一起发送。