Tag Friends in Facebook Photo Upload

Question

I'd like to be able to tag existing friends using the graph api:

Here's the code I have at the moment. The photo is being uploaded, but the photo isn't tagging the user specified in the user_id:

        UIImage *testImage = [UIImage imageNamed:@"sendingTo"];
        NSMutableDictionary *params = [NSMutableDictionary dictionaryWithObjectsAndKeys:kFacebookFBConnectAppID, @"app_id",
                                       testImage, @"source",
                                       @"1381470076", @"message_tags",
                                       @"TEST!", @"message", nil];


        [self.socialIntegration.facebook requestWithGraphPath:[NSString stringWithFormat:@"/me/photos?access_token=%@", self.socialIntegration.facebook.accessToken]
                                                    andParams:params 
                                                andHttpMethod:@"POST" andDelegate:self];

Is the message_tags attribute not the correct attribute to use?

Thanks!

EDIT From what I see here (https://developers.facebook.com/docs/reference/api/photo/#tags), it looks like I need to make three calls in total:

1. Post the Photo with the code I already have
2. Ask Facebook to give me the ID of this photo (which i can probably get from the FBRequestDelegate)
3. Tag People after posting.

Answer 1

ok, figured it out.

Here's how you do it.

First, you upload the image.

        UIImage *testImage = [UIImage imageNamed:@"sendingTo"];
        NSMutableDictionary *params = [NSMutableDictionary dictionaryWithObjectsAndKeys:kFacebookFBConnectAppID, @"app_id",
                                       testImage, @"source",
                                       @"TEST!", @"message", nil];


        [self.socialIntegration.facebook requestWithGraphPath:[NSString stringWithFormat:@"/me/photos?access_token=%@", self.socialIntegration.facebook.accessToken]
                                                    andParams:params 
                                                andHttpMethod:@"POST" andDelegate:self];

Next, upon successful upload, the - (void)request:(FBRequest *)request didLoad:(id)result method will return a dictionary result with 1 key id. That ID is the photoID of the photo you just uploaded, which you save into a string:

NSString *photoID = [NSString stringWithFormat:@"%@", [(NSDictionary*)result valueForKey:@"id"]];

Then make another GraphAPI request to tag your friends. In the code below I am tagging one specific friends, but to tag multiple friends use CSV string or array:

[self.socialIntegration.facebook requestWithGraphPath:[NSString stringWithFormat:@"%@/tags/%@?access_token=%@", photoID, @"1381470076", self.socialIntegration.facebook.accessToken]
                                                    andParams:nil 
                                                andHttpMethod:@"POST" andDelegate:self];