Myujth

I have been refactoring my code and now I'm having trouble with the posts.

Whenever I add a new post to the collection view, it is being added in a random cell and out of order, instead of in the first post.

I know the reason is the fetchuser function and from what I'm being told due to the asynchronous loading, but don't know what to do in order to correct this.

Could someone help me figure out what to do so that my posts are added in the first cell?

 @objc func observePostsAdoption() 
 let postsRef = Database.database().reference().child("posts")
 postsRef.queryOrdered(byChild: "postType").queryEqual(toValue: "adopt").observe(.value) (snapshot) in
 var tempPost = [Posts]()
 for child in snapshot.children 
 if let childSnapshot = child as? DataSnapshot 
 let dict = childSnapshot.value as? [String: Any]
 let newAdoptiondPost = Posts.transformPost(dict: dict!)
 //This will look up all users at once
 self.fetchUser(userid: newAdoptiondPost.userid!, completed: 
 tempPost.insert(newAdoptiondPost, at: 0)
 DispatchQueue.main.async 
 self.postsadoption = tempPost
 self.adoptionCollectionView.reloadData()
 self.refresherAdoption.endRefreshing()
 
 )
 

 
 


func fetchUser(userid: String, completed: @escaping ()-> Void ) 

 Database.database().reference().child("users").child(userid).observeSingleEvent(of: .value) (snapshot) in
 if let dict = snapshot.value as? [String: Any] 
 let user = UserProfile.transformUser(dict: dict)
 self.users.insert(user, at: 0)
 completed()
 
 

Here's my Post Struct

class Posts 

//UserView
var uid: String?
var author: UserProfile?
var timestamp: Date?
var userid: String?

func getDateFormattedString() -> String 
 let formatter = DateFormatter()
 formatter.dateFormat = "MMM d, HH:mm"
 return formatter.string(from: self.timestamp!)


//Image
var photoUrl: URL?

//PostInformation View
var city: String?
var municipality: String?
var name: String?
var breed : String?
var phone : String?
var address : String?
var petType: String?
var genderType: String?
var comments: String?

extension Posts

static func transformPost(dict: [String: Any]) -> Posts 

 let post = Posts()

 //Post Picture
 let photoUrl = dict["photoUrl"] as? String
 post.photoUrl = URL(string: photoUrl!)

 //INFO POSTS
 post.userid = dict["userid"] as? String
 post.city = dict["city"] as? String
 post.municipality = dict["municipality"] as? String
 post.name = dict["name"] as? String
 post.breed = dict["breed"] as? String
 post.phone = dict["phone"] as? String
 post.address = dict["address"] as? String
 post.comments = dict["comments"] as? String
 post.petType = dict["petType"] as? String
 post.genderType = dict["gender"] as? String
 let timestamp = dict["timestamp"] as? Double
 post.timestamp = Date(timeIntervalSince1970: timestamp!/1000)

 return post

If you already have the posts ordered by post type you can just do sorting depending on the timestamp. For example

@objc func observePostsAdoption() 
 let postsRef = Database.database().reference().child("posts")
 postsRef.queryOrdered(byChild: "postType").queryEqual(toValue: "adopt").observe(.value) (snapshot) in
 var tempPost = [Posts]()
 for child in snapshot.children 
 if let childSnapshot = child as? DataSnapshot 
 let dict = childSnapshot.value as? [String: Any]
 let newAdoptiondPost = Posts.transformPost(dict: dict!)
 //This will look up all users at once
 self.fetchUser(userid: newAdoptiondPost.userid!, completed: 
 tempPost.insert(newAdoptiondPost, at: 0)
 DispatchQueue.main.async 
 self.postsadoption = tempPost
 self.postsadoption.sort (p1, p2) -> Bool in
 return p1.timeStamp?.compare(p2.timeStamp!) == .orderdDescending
 
 self.adoptionCollectionView.reloadData()
 self.refresherAdoption.endRefreshing()
 
 )
 

 
 
 

With that the posts adoption array will be sorted depending on the timestamp that you have.