Hello All,
I am new to the forum and super new to the Xcode & swift. I am trying to connect my backend with an examplar chat frontend. However, I am totally lost on how to connect my NLP API with postman link. Messages will be stored on firebase for the interaction analysis purposes for a test flight. It is my first project and I absolutely enjoy it but I need support! 
Any help is appreciated.
Best!
Kyoto
import Foundation
import FirebaseFirestore
import FirebaseFirestoreSwift
class MessagesManager: ObservableObject {
@Published private(set) var messages: [Message] = []
@Published private(set) var lastMessageId: String = “”
// Create an instance of our Firestore database
let db = Firestore.firestore()
// On initialize of the MessagesManager class, get the messages from Firestore
init() {
getMessages()
}
// Read message from Firestore in real-time with the addSnapShotListener
func getMessages() {
db.collection("messages").addSnapshotListener { querySnapshot, error in
// If we don't have documents, exit the function
guard let documents = querySnapshot?.documents else {
print("Error fetching documents: \(String(describing: error))")
return
}
// Mapping through the documents
self.messages = documents.compactMap { document -> Message? in
do {
// Converting each document into the Message model
// Note that data(as:) is a function available only in FirebaseFirestoreSwift package - remember to import it at the top
return try document.data(as: Message.self)
} catch {
// If we run into an error, print the error in the console
print("Error decoding document into Message: \(error)")
// Return nil if we run into an error - but the compactMap will not include it in the final array
return nil
}
}
// Sorting the messages by sent date
self.messages.sort { $0.timestamp < $1.timestamp }
// Getting the ID of the last message so we automatically scroll to it in ContentView
if let id = self.messages.last?.id {
self.lastMessageId = id
}
}
}
// Add a message in Firestore
func sendMessage(text: String) {
do {
// Create a new Message instance, with a unique ID, the text we passed, a received value set to false (since the user will always be the sender), and a timestamp
let newMessage = Message(id: "\(UUID())", text: text, received: false, timestamp: Date())
// Create a new document in Firestore with the newMessage variable above, and use setData(from:) to convert the Message into Firestore data
// Note that setData(from:) is a function available only in FirebaseFirestoreSwift package - remember to import it at the top
try db.collection("messages").document().setData(from: newMessage)
} catch {
// If we run into an error, print the error in the console
print("Error adding message to Firestore: \(error)")
}
}
}