Restkit MultiForm Post with an Image

Question

问题

我一直在尝试向服务器发布一个包含图像附件的多种形式的请求。我没有遇到将图像发送到服务器的问题，这是其他信息发送不正确。

详细信息

当从服务器接收对象时，我使用对象映射来配置几个不同的属性：

//Using a custom class to map object I receive to
RKObjectMapping * memoryMapper = [RKObjectMapping mappingForClass:[MemoContent class]];
[memoryMapper mapAttributes:@"created", @"user", @"participants", @"tags", @"text", @"kind", @"video", @"location", nil];
[memoryMapper mapKeyPath:@"_id" toAttribute:@"memoryID"];
//MediaMapper handles the data needed for the Image attachments
RKObjectMapping * mediaMapper = [RKObjectMapping mappingForClass:[MemoMedia class]];
[mediaMapper mapKeyPath:@"processed" toAttribute:@"processed"];
[mediaMapper mapKeyPath:@"original" toAttribute:@"original"];
[mediaMapper mapKeyPath:@"mime" toAttribute:@"mimeType"];
[memoryMapper mapKeyPath:@"media" toRelationship:@"rawMedia" withMapping:mediaMapper];
//
[[RKObjectManager sharedManager].mappingProvider setMapping:memoryMapper forKeyPath:@"memories"];
[RKObjectManager sharedManager].serializationMIMEType = RKMIMETypeFormURLEncoded;
[RKObjectManager sharedManager].acceptMIMEType = RKMIMETypeJSON;

然后，当发布照片的时候，我更新配置如下：

RKObjectMapping * memoryMapper = [RKObjectMapping mappingForClass:[MemoContent class]];
[memoryMapper mapAttributes:@"created", @"participants",  nil];
[[RKObjectManager sharedManager].mappingProvider setSerializationMapping:memoryMapper forClass:[MemoContent class]];
[[RKObjectManager sharedManager].mappingProvider setMapping:memoryMapper forKeyPath:@"memory"];

参与者是带有照片标签的人。以下是我发布的方式，类似于此https://github.com/RestKit/RestKit/wiki/Attach-a-File-to-an-RKObjectLoader

[[RKObjectManager sharedManager] postObject:theMemory usingBlock:^(RKObjectLoader * loader){
RKObjectMapping* serializationMapping = [[[RKObjectManager sharedManager] mappingProvider] serializationMappingForClass:[MemoContent class]];
NSLog(@"serializationMapping: %@", serializationMapping);
loader.delegate = APP; //main app delegate posting, updating
NSError* error = nil;
RKObjectSerializer * serializer = [[RKObjectSerializer alloc] initWithObject:theMemory mapping:serializationMapping];
NSDictionary * dictionary = [serializer serializedObject:&error];  
RKParams * params = [RKParams paramsWithDictionary:dictionary];
NSData * imageData = UIImagePNGRepresentation(theMemory.photo); //image data
[params setData:imageData MIMEType:@"image/png" forParam:@"attachment"];
loader.params = params;
loader.serializationMIMEType = RKMIMETypeFormURLEncoded;
}];

服务器正在按计划接收图像，实际上确实接收到了"创建的"one_answers"参与者"。不幸的是，它的格式很奇怪，服务器不理解。它包括换行符和participants (n 19843589323 n created: n 3-31-2012 00:00(类似的东西，我会在访问日志时更新。

我会给你任何你需要的额外信息。如果我有足够的能力，我会为它提供声誉；)

Answer 1

在RestKit 0.20.0-pre3中，RKObjectManager确实有方法multipartFormRequestWithObject:method:path:parameters:constructingBodyWithBlock:

Answer 2

此任务的示例可以在RestKit Github页面上找到：

Article *article = [Article new];
UIImage *image = [UIImage imageNamed:@"some_image.png"];
// Serialize the Article attributes then attach a file
NSMutableURLRequest *request = [[RKObjectManager sharedManager] multipartFormRequestWithObject:article method:RKRequestMethodPOST path:nil parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
[formData appendPartWithFileData:UIImagePNGRepresentation(image)
name:@"article[image]"
fileName:@"photo.png"
mimeType:@"image/png"];
}];
RKObjectRequestOperation *operation = [[RKObjectManager sharedManager] objectRequestOperationWithRequest:request success:nil failure:nil];
[[RKObjectManager sharedManager] enqueueObjectRequestOperation:operation]; // NOTE: Must be enqueued rather than started