Showing post from currentUsers wall - Firebase / Swift - ios

Question

I am trying to create a wall/timeline that shows posts from all the users that currentUser is following. All users that currentUser is following is showed under Users -> UserID -> Following. Whenever one of their followers is making a post it will be added under feed-items with an autoID - the key (the autoID) is added to currentUsers Users -> UserID -> Wall at the same time.
Here is an image of an example from my Firebase database:
Under Wall as you can see, one of this users followers has made a post (the whole post is saved under feed-items) and the autoID of that post has made it to the users Wall.
Now I am trying to figure out how to show all the posts in feed-items, based on the autoID's stored under currentUsers Wall.
I have tried the following code, but nothing shows and when it reaches this line print(self.updates.count) it is printing 0.
func startObersvingDB(userID: String) {
FIRDatabase.database().reference().child("Users").child(userID).child("Wall").observeEventType(.ChildAdded, withBlock: { snapshot in
if let posts = snapshot.value!["Post"] as? String {
self.postArray.append(posts)
for i in 0..<self.postArray.count {
let post = self.postArray[i]
print(post)
FIRDatabase.database().reference().child("feed-items").queryEqualToValue(post).observeEventType(.Value, withBlock: { (snapshot: FIRDataSnapshot) in
var newUpdates = [Sweet]()
for update in snapshot.children {
let updateObject = Sweet(snapshot: update as! FIRDataSnapshot)
newUpdates.append(updateObject)
}
self.updates = newUpdates.reverse()
print(self.updates.count)
self.tableView.reloadData()
}) { (error: NSError) in
print(error.description)
}
}
}
})
}

Answer 1

If I am guessing right, your structure for feed-items is something like this.
feed-items
-UniquePostID
-Post Data (key-value pair(s))
If this is the case then to retrieve data for a post use .child(post) instead of .queryEqualToValue(post). Also since this will return DataSnapshot for single post you can directly create your Sweet object and append it in existing updates array.
One more thing I don't think you need to iterate entire postArray each time a new post is added. You should retrieve data for new post only.
Hope this helps!!