Grab all Child nodes of a child in Firebase?

Question

I am struggling with something I want to do in Firebase. I can't seem to figure out how to do this. I've found the answer of I want to do with a Javascript-approach but can't seem to do this with iOS. What I have is a set of data that looks something like this:

events
  -JFSDFHdsf89498432
    eventCreator: "Stephen"
    eventCreatorId: 1764137
  -JOeDFJHFDSHJ14312
    eventCreator: "puf"
    eventCreatorId: 892312
event_attendees
  -JFSDFHdsf89498432
    -JSAJKAS75478
      name: "Johnny Appleseed"
      objectID: "1"
    -JSAJKAS75412
      name: "use1871869"
      objectID: "2"
  -JOeDFJHFDSHJ14312
    -JaAasdhj1382
      name: "Frank van Puffelen"
      objectID: "3"
    -Jo1asd138921
      name: "use1871869"
      objectID: "4"

What I want to do is grab every child's child's information within the event_attendees reference and store that information into a database. For example, I want to grab event_attendees -> JFSDFHdsf89498432 -> JSAJKAS75478 -> name: Johnny Appleseed and objectID: "1" and store this information into some sort of dictionary. I want to do this pattern for every child within the JFSDFHdsf89498432 child. At the end, my array would look something like this:

Array = [
 {name: "Johnny Appleseed", objectID: "1"},
 {name: "use1871869", objectID: "2"}
]

Upon doing so, the function would return this array via a completion handler, thus finishing the function. However, I can't seem to find a way to do this. The following is my attempt:

func getAttendees(child: String, completion: (result: Bool, name: String?, objectID: String?) -> Void){
    //Get event attendees of particular event
    var attendeesReference = self.eventAttendeesRef.childByAppendingPath(child)
    var newArrayOfAttendees = [AnyObject]()

    println("Loading event attendees")
    //Get all event attendees

    attendeesReference.observeEventType(FEventType.Value, withBlock: { (snapshot) -> Void in

        for i in snapshot.children {
            newArrayOfAttendees.append(i)
            //This returns an entire snapshot which I'm not sure how to parse that looks like so:
            /*
                Snap (JFSDFHdsf89498432) {
                   name = "Johnny Appleseed";
                   objectID = "1";
                  }
            */
            //I also cannot seem to access i.value
            //because i.value gives me an error saying 
            //Could not find member 'init'
            //But the JavaScript version says you can do that via: https://www.firebase.com/docs/web/api/datasnapshot/foreach.html
            //But i.key returns me JFSDFHdsf89498432 which is correct.
        }
        completion(result: true, attendees: newArrayOfAttendees)
        }) { (error) -> Void in
            println(error.description)
    }

And I just can't seem to figure out how to get all the children of a child node, store that into an array, and pass that array through a completion handler. If anyone could help me out that would be great. Thank you so much.

Please don't use generic terms like "child" when you have something meaningful, like "event" and "attendee". So instead of "I want all the child childs of child" you can say, I want all attendees of event -JFSDFHdsf89498432`. When you update the question with that, please also show how you invoke `getAttendees` and what value of `child` you're passing in. — Frank van Puffelen, Jul 11 '15 at 02:44
In my comment (http://stackoverflow.com/questions/31305915/more-efficient-way-to-retrieve-firebase-data#comment50604873_31307494) I used `child_added` for getting the attendees. On iOS `child_added` translates to `FEventTypeChildAdded` and is documented here: https://www.firebase.com/docs/ios/guide/retrieving-data.html#section-event-types — Frank van Puffelen, Jul 11 '15 at 02:47
If you want to use `.Value`, this question seems to have an example where iterating over the children works: http://stackoverflow.com/questions/27341888/iterate-over-snapshot-children-in-swift-firebase — Frank van Puffelen, Jul 11 '15 at 02:52

Grab all Child nodes of a child in Firebase?

0 Answers0