> So I know there is a RKObjectMapperDelegate which if adopted would allow
> me to be notified of failed mappings. But I am not sure how to get access
> to the actual ObjectMapper when the mappings happen.

> Here is how I make my requests.

> - (void) fetchThingsWithDelegate:(id)aDelegate {
>     if (nil != self) {

>         [self.objectManager setClient:[RKClient sharedClient]];
>         [[RKClient sharedClient] setUsername:[self.prefs
> objectForKey:kUserDefaultsCurrentUsername]];
>         [[RKClient sharedClient] setPassword:[self.prefs
> objectForKey:kUserDefaultsCurrentPassword]];
>         [[RKClient sharedClient] setServiceUnavailableAlertEnabled:YES];

>         NSString *path = [NSString
> stringWithFormat:@"/attributes/things?login_id=%@&password=%@",
>                           [self.prefs
> objectForKey:kUserDefaultsCurrentUsername], [self.prefs
> objectForKey:kUserDefaultsCurrentPassword]];

>         self.loader = [self.objectManager loaderWithResourcePath:path];
>         loader.delegate= aDelegate;
>         loader.userData = kUserDefaultsRooms;
>         loader.method = RKRequestMethodGET;

>         [loader send];