sendData:toResourcePath:usingBlock

gistfile1.m

// Encode some arbitrary data and send it to the remote server. Object mapping will be performed on the results
- (RKObjectLoader *)sendData:(id)data toResourcePath:(NSString *)resourcePath usingBlock:(void (^)(RKObjectLoader *objectLoader))block {
    RKObjectLoader* loader = [self objectLoaderWithResourcePath:resourcePath delegate:nil];
    
    id<RKParser> parser = [[RKParserRegistry sharedRegistry] parserForMIMEType:self.serializationMIMEType];
    NSString* string = [parser stringFromObject:serializedObject error:error];

    NSData* data = [string dataUsingEncoding:NSUTF8StringEncoding];
    loader.params = [RKRequestSerialization serializationWithData:data MIMEType:self.serializationMIMEType];
    loader.method = RKRequestMethodPOST;

    // Yield to the block for setup
    block(loader);
    
    [loader send];
    return loader;
}