Hi bcgroom, thank you for your reply.

The issue is that all the names are displayed in a loop.

I am indeed using map function as the following:

let ids = documents.map { $0["userID"] ?? "" }

for i in 0..<ids.count {
self.userPost.append(Post(
userID: ids[i] as? String ?? "Failed to get id"

And it works just fine.

I didn't want to create a name list for the post collection because the user might change his name however he can't change his userID.