pass native object in URL

I was following the tutorial here.

The code I have is:

- (void) didSelectObject:(id) object atIndexPath:(NSIndexPath*) indexPath    
{
    Group * group = (Group *)((RKMappableObjectTableItem *) object).object;
    [self.tableView deselectRowAtIndexPath:indexPath animated:YES];

    group.unread = 0;
    [self.tableView reloadData];

    TTURLAction *action =  [[[TTURLAction actionWithURLPath:@"tt://group"] 
                             applyQuery:[NSDictionary dictionaryWithObject:group forKey:@"kParameterUser"]]
                            applyAnimated:YES];
    [[TTNavigator navigator] openURLAction:action];

}

I have set the mapping as:

[map from:@"tt://group" toSharedViewController:[TopicsViewController class]];

and inside my TopicsViewController I have both tried:

- (id) initWithNavigatorURL:(NSURL*)URL query:(NSDictionary*)query {

but it didn't work. It's as if it can't find any mapping. Why is this? What am I doing wrong?

UPDATE:

Here's the updated code based on the suggestion:

 TTURLAction *action =  [[[TTURLAction actionWithURLPath:@"tt://group"] 
                                 applyQuery:[NSDictionary dictionaryWithObject:group forKey:@"kParameterUser"]]
                                applyAnimated:YES];
        [[TTNavigator navigator] openURLAction:action];

[map from:@"tt://group?" toSharedViewController:[TopicsViewController class] selector:@selector(initWithNavigationURL:)];

- (id) initWithNavigatorURL:(NSURL*)URL query:(NSDictionary*)qu开发者_运维百科ery 

what am I doing wrong here?

You are not telling it what selector to cal! First, add a ? to the end of your mapping: @"tt://group?"

When you add any query dictionaries, they are sent like normal params in a url (?foo=bar&apple=orange).

Next, if you aren't going to use the selector as part of the URL mapping, use the from:toSharedViewController:selector: method to set the selector to the selector you wish to call.

I don't know three20 very well, I think however you first need to create an URL to the object you'd like to pass, which can be mapped.

It appears like three20 provides a category on nsobject which allows you to call:
NSString* url = [myFooObject URLValueWithName:@"barName"];

This method should be inherited from NSObject by almost any Framework Class.

See NSObjects to URLs in the chapter URL mapping methods from the tutorial you posted.