Implementing object mapping using RestKit in Objective-C - objective-c

Question

I am having trouble mapping a JSON response to objects using RestKit and Objective-C.
I have already set up my RKObjectManager and mappings in my AppDelegate as suggested in my previous post by mja.
I call my backend in my controller as per the example below.
There are two issues I'm having trouble with:
[[RKObjectManager sharedManager] postObject:request mapResponseWith:responseMapping delegate:self]; } <-- This results in a "self" is incompatible with type id. What do I need to send to this?
How do I cast the result in didLoadObject to the Translation object I've defined (translationText)
Any help would be much appreciated.
#synthesize inputtext = _text;
#synthesize translation = _translation;
#synthesize translatedText = _translatedText;
- (Translation *)translatedText {
if (!_translatedText) _translatedText = [[Translation alloc] init];
return _translatedText; }
- (IBAction)translatePressed {
//create TranslationRequest
TranslationRequest *request = [[TranslationRequest alloc] init];
[request setSourceId:#"1"];
[request setRegionTag:#"Hello"];
[request setInputString:self.inputtext.text];
//fetch the desired mapping to map response with
RKObjectMapping * responseMapping = [[RKObjectManager sharedManager].mappingProvider objectMappingForClass:[Translation class]];
[[RKObjectManager sharedManager] postObject:request mapResponseWith:responseMapping delegate:self]; }
- (void)objectLoader:(RKObjectLoader*)objectLoader didLoadObject:(id)object {
self.translation.text = [object translatedText].translation;
}
- (void)objectLoader:(RKObjectLoader*)objectLoader didFailWithError:(NSError*)error {
NSLog(#"Hit error: %#", error);
}

Answer 1

to rectify the first issue, declare your controler in the .h file as follows:
#import "RestKit/RestKit.h"
...
#interface MyController : UIViewController<RKObjectLoaderDelegate>
You cast it just like this:
- (void)objectLoader:(RKObjectLoader*)objectLoader didLoadObject:(id)object {
Translation *myTranslation = (Translation*)object;
...
}
or you can avoid the cast by calling appropriate selector
- (void)objectLoader:(RKObjectLoader*)objectLoader didLoadObject:(id)object {
self.translation.text = [[object translatedText] translation];
}
you may update your question with the definition of #properties in your Translation object in order to be sure this answer is correct.