How to Update CollectionView Model with Firebase? - swift

Question

I am trying to intitialize my Collection View Model which holds a list of [Users] with a firebase snap that holds data.
Here is the Collection View Model code:
typealias JSON = [String:Any]
class HomeDataSource: Datasource {
var users: [User]
init?(with snapshot:DataSnapshot) {
var users = [User]()
guard let snapDict = snapshot.value as? [String: [String:Any]] else {return nil}
for snap in snapDict {
guard let user = User(dict: snap.value) else {continue}
users.append(user)
}
self.users = users
}
}
User Model:
struct User {
let name: String
let username: String
init?(dict: JSON) {
guard let name = dict["name"] as? String,
let email = dict["email"] as? String
else {return nil}
self.name = name
self.username = email
}
}
Firebase Snap:
Snap (users) {
8CVeHMNHI6hZAWj1zhGHEjPwYYz1 = {
email = "Silviu#isidors.sjsj";
name = Bshdjdj;
};
9CuqgR4Es7TOPPJQEpSnQXlfYnm1 = {
email = "Test#silviu.com";
name = "Test#silviu.com";
};
DBqGWlpdJKME570euqUz2rqI5Z83 = {
email = "Test#test.test";
name = Test;
};
}
Fetch Function:
func fetchUser() {
let ref = Database.database().reference().child("users")
ref.observe(.childAdded, with: { (snapshot) in
let user = User(dict: snapshot.value as! JSON)
self.users.append(user!)
print(self.users)
let new = HomeDataSource(with: snapshot)
print(new)
DispatchQueue.main.async(execute: {
self.datasource = new
self.collectionView?.reloadData()
})
}, withCancel: nil)
}
Right now, I am getting an array of Users from Firebase, however my collection view won't update.
My question is how should I update my Collection View Model and Fetching Function so it can fetch data from Firebase and Populate the Collection View Correctly?

Answer 1

So the problem was the node I was targeting. Removed "child("users")" form fetching function and targeted the whole users node with uids. Then I was looping the snapshot.value while I casted it in [String:[String:Any]], because each snapshot.valuelooked like this (key: "vijwUkzAlbgcqjAammfy0JuVMB33", value: ["name": Silviu, "email": Office#isidors.com]) Finally, I updated the HomeDataShource Class like this:
class HomeDataSource: Datasource {
var users: [User]
init(with snapshot:DataSnapshot) {
var users = [User]()
let snapDict = snapshot.value as? [String:[String:Any]]
for snap in snapDict! {
guard let user = User(snap: snap.value) else {continue}
users.append(user)
}
self.users = users
}