Decoding query documents

Kassymkhan.swift

Firestore.firestore().collection("Portfolio").getDocuments() { query, error in
    if let documents = query.documents {
      let portfolios: [HistoryCompany] = documents.map { document in
        return try! FirestoreDecoder().decode(HistoryCompany.self, from: document.data()
      }
    } else {
        print("Document does not exist")
    }
}