How to call a JSON Method in iOS

Question

There is a JSON call which when i call via curl like below:

curl -H "Content-Type:application/json" -H "Accept:application/json" -d "{\"checkin\":{\"message\":\"this is a test\"}}" http://gentle-rain-302.heroku.com/checkins.json

I get this result:

{"checkin":{"created_at":"2011-01-29T13:52:49Z","id":3,"message":"this is a test","updated_at":"2011-01-29T13:52:49Z"}}

But when i call in my iPhone App like below:

- (void)doCheckIn:(NSString *)Str
{
    NSString *path = [[NSBundle mainBundle] bundlePath];
    NSString *finalPath = [path stringByAppendingPathComponent:@"inStore-settings.plist"];
    NSDictionary *plistDictionary = [[NSDictionary dictionaryWithContentsOfFile:finalPath] retain];

    NSString *appURL = [plistDictionary objectForKey:@"apiurl"];
    appURL = [appURL stringByAppendingString:@"checkins.json"];
    ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:[NSURL URLWithString:appURL]];
    [request setPostValue:@"{\"checkin\":{\"message\":\"test\"}}" forKey:@"message"];
    [request startSynchronous];
    NSError *error = [request error];
    if (!error) {
        NSString *response = [request responseString];
        NSLog(response);
    }
}

I get a result saying :

"The change you wanted was rejected (422)"

Any help is highly appreciated.

Answer 1

Looking at your curl command, I don't think you want to be doing http multipart post, which the ASIFormDataRequest is specifically set to handle. You just want to set the post body of a request to your json string. Try using the normal ASIHTTPRequest class and adding data to the post body via a method like appendPostData: or the like. This should build the appropriate HTTP request for you.

Answer 2

Did you try setting the Accept and Content-Type headers in your ASIFormDataRequest instance?

Answer 3

This piece of code worked:

- (void)doCheckIn:(NSString *)Str
{
    NSString *path = [[NSBundle mainBundle] bundlePath];
    NSString *finalPath = [path stringByAppendingPathComponent:@"inStore-settings.plist"];
    NSDictionary *plistDictionary = [[NSDictionary dictionaryWithContentsOfFile:finalPath] retain];

    NSString *appURL = [plistDictionary objectForKey:@"apiurl"];
    appURL = [appURL stringByAppendingString:@"checkins.json"];
    ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:[NSURL URLWithString:appURL]];
    [request appendPostData:[@"{\"checkin\":{\"message\":\"test by Zuzar\"}}" dataUsingEncoding:NSUTF8StringEncoding]];
    [request addRequestHeader:@"Content-Type" value:@"application/json"];
    [request addRequestHeader:@"Accept" value:@"application/json"];
    [request setRequestMethod:@"POST"];
    [request startSynchronous];
    NSError *error = [request error];
    if (!error) {
        NSString *response = [request responseString];
        NSLog(@"%@", response);
    }

}