Database.database().reference().child("rooms").child(self.matchGameMode).child(self.matchGender).child(self.matchAge).observeSingleEvent(of: DataEventType.value) { (snapshot) in
       print("1")
        if let snapshot = snapshot.children.allObjects as? [DataSnapshot] {
            print("2")
            for snap in snapshot {
                print("3")
                if let postDict = snap.value as? [String: AnyObject] {
                    print("4")
                    let post = postDict
                    self.rooms.insert(post as NSDictionary, at: 0)

                    print("OKay")
                    print(self.matchGameMode)
                    print(self.matchGender)
                    print(self.matchAge)
                    print("= Dictionary (self.rooms)")
                }
            }
        }
    }
    let when = DispatchTime.now() + 2
    DispatchQueue.main.asyncAfter(deadline: when, execute: {
        print("=== Dictionary (self.rooms)")

    })
}