Fetch posts by postId from firebase with swift 4 - swift

Question

All I'm trying to achieve is to have the posts inside my radius append to the collection view. Currently I'm getting all the postId when the user enters the radius but nothing is being append to the collection view and I can't figure out why. Any help is very much appreciated.
var posts = [Post]()
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
let userLocation: CLLocation = locations[0] as CLLocation
let currentUserLocation = userLocation
let circleQuery = geoFire?.query(at: currentUserLocation, withRadius: 100.0)
_ = circleQuery?.observe(.keyEntered, with: { (key, location) in
guard let user = self.user else { return }
let ref = Database.database().reference().child("posts").child(key)
ref.observeSingleEvent(of: .value, with: { (snapshot) in
guard let dictionaries = snapshot.value as? [String: Any] else { return }
var post = Post(user: user, dictionary: dictionaries)
post.id = key
self.posts.append(post)
self.posts.sort(by: { (post1, post2) -> Bool in
return post1.creationDate.compare(post2.creationDate) == .orderedDescending
})
}, withCancel: { (error) in
print("There was an error getting the posts:", error)
})
})
}
fileprivate func fetchPostUserIds() {
Database.database().reference().child("users").observe(.value, with: { (snapshot) in
guard let userIdsDictionary = snapshot.value as? [String: Any] else { return }
userIdsDictionary.forEach({ (key, value) in
let uidKey = key
self.geoFireRef = Database.database().reference().child("posts").child(uidKey)
self.geoFire = GeoFire(firebaseRef: self.geoFireRef)
})
}) { (err) in
print("Failed to get user Id", err)
}
}