Correct Ordering Descending Firebase

DescendingFirebase.swift

/*
*   Custom Ordering Field: Descending
*   - Trust me, this is the simplest way to do this with Firebase. 🤘
*/
imageObj["order"] = -image.uploadedAt.timeIntervalSince1970


/* */
FirebaseDatabaseReference.photos
            .child(eventKey)
            .queryOrdered(byChild: "order")
            .observe(.childAdded, with: { snapshot in
                do {
                    let image = try Image(snapshot: snapshot)
                    
                    // Note to self: Need to do this also to maintain descending ordering after first init from .queryOrdered(byChild: "order").
                    // Now you're thinking why not just do self.images.insert(image, at: 0) right? Well that fucks up initial ordering so just don't. Trust me.
                    self.images.append(image)
                    self.images.sort(by: {$0.uploadedAt > $1.uploadedAt})
                    
                    // Update UI
                    self.imagesCollectionView.insertItems(at: [IndexPath(row: self.images.count - 1, section: 0)])
                    self.imagesCollectionView.scrollToItem(at: IndexPath.zero, at: .right, animated: true)
                    
                    // Important! Reload Data off the main queue.
                    DispatchQueue.main.async(execute: self.imagesCollectionView.reloadData)
                }
                catch let error {
                    print("Database error at \(FirebaseDatabaseReference.photos.child(eventKey)): \(error.localizedDescription)")
                }
            })