gistfile1.m

//POSTing a message to the server and checking the response.


//POST the message to the server
NSData *responseData = [NSURLConnection sendSynchronousRequest:request 
                                             returningResponse:&response error:&error];
                                             
//Extract the JSON string from the response
NSString *jsonString = [[NSString alloc] initWithData:responseData 
                                             encoding:NSUTF8StringEncoding];

/*
The returned JSON string will look like this:
{
    "message": {
        "user_first_name": "bob",
        "user_last_name": "smith",
        "kind": "message",
        "created_at": "2009-10-27T04:11:47Z",
        "body": "email@example.com",
        "updated_at": "2009-10-27T04:11:47Z",
        "id": 1,
        "user_id": 1 
    } 
}

- You will need to convert it to an Objective-C dictionary first.

- Then you have to extract the inner dictionary.

- You can now get the returned ID and check it.
*/

//Create a dictionary from the reponse from the server - Using TouchJSON
NSDictionary *messageDictionary = [[CJSONDeserializer deserializer] 
                                   deserializeAsDictionary:responseData 
                                   error:nil];

//Extract the inner dictionary
NSDictionary *innerDictionaray = [messageDictionary objectForKey:@"message"];
  
//Get the message id and inspect it    
NSString *messageId = [innerDictionaray objectForKey:@"id"];

if (messageId) {

    // Now you can add the new message to Core Data
}