Get Facebook friends at an event?

Question

How can I see which of my friends are attending a Facebook event? I can get a list of all members using the Facebook SDK using GraphPath: @ "eventId / attendending /".

Is it possible that I want to use the Graph API? I read a few answers on how to achieve this using FQL, but I don’t know how to implement it in iOS. The only option I came across was to gather all the friends and all the participants and cross-reference them against each other, but this is very inconvenient.

So, how do I get only friends from Facebook to Facebook?

Answer 1

Ok, so I found a solution to my problem ... The only way to achieve what I want is through FQL. Basically, these are cross-references of your friends with participants, but on Facebook servers, and you only get the data that you request (in my case, user ID, name, image). I did not understand how to set the limit and offset, but I do not require this, and I think it is possible through FQL ...

Here is my code:

-(void)getFriendsAttending{ NSLog(@"getting friends"); NSString *fql = [NSString stringWithFormat:@"SELECT uid, name, pic FROM user WHERE uid IN (SELECT uid FROM event_member WHERE eid = %@ AND rsvp_status = 'attending' AND uid IN (SELECT uid2 FROM friend WHERE uid1 = me()))", fbID]; NSMutableDictionary *params = [NSMutableDictionary dictionaryWithObject:fql forKey:@"q"]; [FBRequestConnection startWithGraphPath:@"/fql" parameters:params HTTPMethod:@"GET" completionHandler:^(FBRequestConnection *connection, id result, NSError *error) { if (error) { NSLog(@"Error: %@", [error localizedDescription]); } else { NSLog(@"Friends at event %@: %@", fbID, result); } }]; } 

And here is a clean FQL query for clarity (123456789 is the event identifier):

 SELECT uid, name, pic FROM user WHERE uid IN (SELECT uid FROM event_member WHERE eid = 123456789 AND rsvp_status = 'attending' AND uid IN (SELECT uid2 FROM friend WHERE uid1 = me())) 

Answer 2

This is from a tutorial provided by Facebook.

You can check whether a specific user answered “yes” to the HTTP GET event on / EVENT_ID / visit / USER_ID. These operations require the permission of user_events or friends_events for non-public events and return an array of objects with the name id and rsvp_status. When checking one user, empty data will be returned if the user did not answer “yes” to the event.

You can verify this by checking the event category at this link:

http://developers.facebook.com/docs/reference/api/event/

Use / EVENT_ID / attending / USER_ID to find out which friend is attending an event

Answer 3

Just use {event id} / attending, and then filter it based on your actual friends list.

Answer 4

Using FQL Query try:

 SELECT uid FROM event_member WHERE eid = YOU_EVENT_ID_HERE AND rsvp_status = 'attending' 

Using the Graph API:

 /YOU_EVENT_ID_HERE/attending 

This returns the visited friends user id (uid).

ASH