Non-deprecated means of setting object mapping - objective-c

Question

I have a Ruby On Rails local server running which serves me the following JSON:
[ { "content" : "Here is content",
"created_at" : "2012-10-07T01:06:51Z",
"id" : 4,
"name" : "Joe",
"title" : "Title 1",
"updated_at" : "2012-10-07T01:06:51Z"
},
{ "content" : "Here is content",
"created_at" : "2012-10-07T01:07:09Z",
"id" : 5,
"name" : "John",
"title" : "Title2",
"updated_at" : "2012-10-07T01:07:09Z"
}
]
I am using RestKit to parse this into Post model objects like so:
- (void)loadObjects
{
RKObjectMapping *objectMapping = [RKObjectMapping mappingForClass:[Post class]];
[objectMapping mapKeyPath:#"id" toAttribute:#"postId"];
[objectMapping mapKeyPath:#"created_at" toAttribute:#"createdAt"];
[objectMapping mapKeyPath:#"content" toAttribute:#"content"];
[objectMapping mapKeyPath:#"title" toAttribute:#"title"];
[objectMapping mapKeyPath:#"name" toAttribute:#"name"];
[objectMapping mapKeyPath:#"updated_at" toAttribute:#"updatedAt"];
RKObjectManager* manager = [RKObjectManager objectManagerWithBaseURLString:#"http://localhost:3000/"];
[manager loadObjectsAtResourcePath:#"/posts" objectMapping:objectMapping delegate:self];
}
- (void)objectLoader:(RKObjectLoader *)objectLoader didLoadObjects:(NSArray *)objects {
NSLog(#"%#", objects);
}
This works fine, however the loadObjectsAtResourcePath:objectMapping:delegate: is deprecated. I assume I should therefore be using loadObjectsAtResourcePath:delegate:, but I cannot figure out a way to set the objectMapping. Any thoughts?
Update
I am now setting the delegate like so:
[manager loadObjectsAtResourcePath:#"/posts" usingBlock:^(RKObjectLoader *loader) {
loader.objectMapping = objectMapping;
loader.delegate = self;
}];

Answer 1

The restkit documentation says that if you use loadObjectsAtResourcePath:usingBlock: you can set the objectMapping from inside the a block.
- (void)loadObjectUsingBlockExample {
[[RKObjectManager sharedManager] loadObjectsAtResourcePath:#"/monkeys.json" usingBlock:^(RKObjectLoader *loader) {
loader.objectMapping = [[RKObjectManager sharedManager].mappingProvider objectMappingForClass:[Monkey class]];
}];
}