CRUD.swift

////
////  CRUD.swift
////  Demo
////
////  Created by iMac on 30/04/20.
////  Copyright © 2020 iMac. All rights reserved.
////
//
import Foundation
//
////
////  ViewController.swift
////  crud-demo
////
////  This source code is for this tutorial: https://youtu.be/qA9L3_cK9Z0
////  Before using, connect your own Firestore database instead of using mine.
////  I've removed my config file so you'll have to sign up for Firebase and add your own GoogleService-Info.plist to Xcode.
////
//
//import UIKit
//import Firebase
//
//class ViewController: UIViewController {
//
//    override func viewDidLoad() {
//        super.viewDidLoad()
//        // Do any additional setup after loading the view.
//
//        let db = Firestore.firestore()
//
//        // Adding a document
//        // See: https://firebase.google.com/docs/firestore/manage-data/add-data
//        db.collection("wine")
//            .addDocument(data: ["year":2017,
//                                "type":"pinot-noir",
//                                "label":"Peller Estates"])
//
//        // Getting the document ID
//        let newDocument = db.collection("wine").document()
//        newDocument.setData(["year":2017,
//                             "type":"pinot-noir",
//                             "label":"Peller Estates",
//                             "id":newDocument.documentID])
//
//
//        // Adding a document with a specific document ID / Or Replacing the data for a specific document ID
//        db.collection("wine")
//            .document("pinot-noir-2017")
//            .setData(["hello":"new data",
//                      "newKey":"newValue"], merge: true)
//
//        // Updating a specific document ID
//        db.collection("wine")
//            .document("stoneypath-cab-2017")
//            .setData(["year":2017,
//                      "type":"cab",
//                      "label":"Stoney Path"], merge:true)
//
//        // Detecting errors (Use the completion handler)
//        db.collection("wine")
//            .addDocument(data: ["test":"test"]) { (error) in
//
//                if error != nil {
//                // There was an error
//            }
//            else {
//                // error is nil.. so operation completed successfully
//            }
//        }
//
//        // Delete a document
//        // See: https://firebase.google.com/docs/firestore/manage-data/delete-data
//        db.collection("wine")
//            .document("stoneypath-cab-2017").delete()
//
//        // Delete a field
//        db.collection("wine")
//            .document("stoneypath-cab-2017")
//            .updateData(["type":FieldValue.delete()])
//
//        // Detect for errors, use completion parameter
//        db.collection("wine")
//            .document("pinot-noir-2017")
//            .delete { (error) in
//
//            if error != nil {
//                // We have an error
//            }
//            else {
//                // Delete was sucessful
//            }
//        }
//
//        // Read a specific document
//        // See: https://firebase.google.com/docs/firestore/query-data/get-data
//        db.collection("wine")
//            .document("pinot-noir-2017")
//            .getDocument { (document, error) in
//
//            // Check for error
//            if error == nil {
//
//                // Check that this document exists
//                if document != nil && document!.exists {
//
//                    let documentData = document!.data()
//
//                }
//
//            }
//
//        }
//        // Getting all documents from a collection
//        db.collection("wine")
//            .getDocuments { (snapshot, error) in
//
//            if error == nil && snapshot != nil {
//
//                for document in snapshot!.documents {
//
//                    let documentData = document.data()
//
//                }
//
//            }
//        }
//
//        // Getting a subset of documents
//        db.collection("wine").whereField("year", isEqualTo: 2017).getDocuments { (snapshot, error) in
//            <#code#>
//        }
//    }
//
//
//}
//