Using POST for flight API - ios

Question

I have been trying to implement the Wego flights API from http://support.wan.travel/hc/en-us/articles/200191669 which uses HTTP POST requests. I've only really ever used GET requests, so I did some reading on POST and so far I have not been able to find a way to post a request with a dictionary of flight data (in objective-c) as shown in the link above:
POST api.wego.com/flights/api/k/2/searches
{
"trips": [
{
"departure_code": "SYD",
"arrival_code": "LON",
"outbound_date": "2014-01-24",
"inbound_date": "2014-01-29"
}
],
"adults_count": 1
}
Do I have to create the NSDictionary myself and then (assign?) it to the request, or is there a way to format the dictionary into a string? Thanks in advance for any help :)

Answer 1

You have to create the POST data as follows:
NSDictionary *trips = [NSDictionary dictionaryWithObjectsAndKeys:
#"SYD", #"departure_code",
#"LON", #"arrival_code",
#"2014-01-24", #"outbound_date",
#"2014-01-29", #"inbound_date",
nil];
NSDictionary *postDict = [NSDictionary dictionaryWithObjectsAndKeys:
trips, #"trips",
#"1", #"adults_count",
nil];
NSError *jsonError = nil;
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:postDict options:NSJSONWritingPrettyPrinted error:&jsonError];
And then make the POST request:
NSURL *url = [[NSURL alloc] initWithString:#"http://api.wego.com/flights/api/k/2/searches"];
NSMutableURLRequest *urlRequest = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:15];
[urlRequest setHTTPMethod:#"POST"];
const char *parameters = [jsonData bytes];
NSData *postData = [[NSData alloc] initWithBytes:parameters length:strlen(parameters)];
[urlRequest setHTTPBody:postData];
NSURLResponse *response = nil;
NSError *requestError = nil;
NSData * data = [NSURLConnection sendSynchronousRequest:urlRequest returningResponse:&response error:&requestError];
NSLog(#"%#", [NSString stringWithUTF8String:[data bytes]]);