trying to access a specific field in Firestore, but can't seem to figure it out. In my document, I have a map like this:
The below is my code. Hour just returns nil for some reason. I've tried a number of different things including ["notificationTime"]["hour"], but can't seem to figure it out. Any idea? Thanks!
self.db.collection("routines").whereField("name", isEqualTo: routineName).getDocuments() { (querySnapshot, err) in
if let err = err {
print ("Error getting documents: \(err)")
} else {
for document in querySnapshot!.documents {
let hour = document.data()["notificationTime.hour"]
print(hour)
return
}
}
}
To read data from a map, use the following approach:
let db = Firestore.firestore()
db.collection("routines").whereField("name", isEqualTo: routineName).getDocuments() { (querySnapshot, err) in
if let err = err {
print("Error getting documents: \(err)")
}
else if let querySnapshot = querySnapshot {
for document in querySnapshot.documents {
let results = document.data()
if let notificationTime = results["notificationTime"] as? [String: Any] {
let hour = notificationTime["hour"] as? Int ?? 0
let minute = notificationTime["minute"] as? Int ?? 0
// ... further handling of your data
}
}
}
}
That being said, I'd like to suggest looking into Timestamps for storing date-time related data. See the documentation for more details.
Related
I have the fetch Data code here, but I don't understand how I am supposed to delete documents without setting the ID to the Document's ID. I was following this tutorial here. https://medium.com/swift-productions/swiftui-easy-to-do-list-with-firebase-2637c878cf1a I'm assuming I need to do so in the data mapping but I don't understand how with this code. I want to remove a todo from a SwiftUI list and also delete it's entire Firestore Document.
func fetchData() {
db.collection("todos").addSnapshotListener { (querySnapshot, error) in
guard let documents = querySnapshot?.documents else {
print("No documents")
return
}
self.todos = documents.map { (QueryDocumentSnapshot) -> Todo in
let data = QueryDocumentSnapshot.data()
let todoDetails = data["todo"] as? String ?? ""
return Todo(todoDetais: todoDetails)
}
}
}
View Model
struct Todo: Codable, Identifiable {
var id: String = UUID().uuidString
var todoDetais: String?
}
I recommend using Codable to map your Firestore documents to Swift structs. This will make your code easier to write, less prone to errors, and more type-safe.
Specifically, it will also enable you to use #DocumentID to map the Firestore document ID to the id attribute of your Swift struct.
Here's a quick example:
struct Book: Codable {
#DocumentID var id: String?
var title: String
var numberOfPages: Int
var author: String
}
func fetchBook(documentId: String) {
let docRef = db.collection("books").document(documentId)
docRef.getDocument { document, error in
if let error = error as NSError? {
self.errorMessage = "Error getting document: \(error.localizedDescription)"
}
else {
if let document = document {
do {
self.book = try document.data(as: Book.self)
}
catch {
print(error)
}
}
}
}
}
For more details, see this comprehensive guide I wrote about mapping Firestore documents to Swift structs (and back).
For more information about how to delete a Firestore document from a SwiftUI app, check out this article
I want to read out the Value of an Field of my document (in Firebase Firestore with SwiftUI).
What I already have I this:
let value = myDataBase
// My Database instance
//
value.collection("My Collection").whereField("Code", isEqualTo: codeTextInput)
.getDocuments() { (querySnapshot, err) in
if let err = err {
print("Error getting documents: \(err)")
} else {
for document in querySnapshot!.documents {
print("\(document.documentID) => \(document.data())")
}
}
}
(This Code works fine)
And now I want to store the Value of all Documents, which are in my collection and have for the key "Code" the value, which is typed in. But I want to store the Data for the key "Wert"
When I've saved it, I want to use it as an User-Default...
Btw. I don’t want collect more then 1 item with this code, I just want that this item which I collect is the right.
Let sum it up:
You want all documents in your collection with a certain value to be fetched
You want to save all of these values and be able to access them.
I can only recommend working with objects in this scenario. Let's make an example:
Lets import all modules
import Foundation
import Firebase
import FirebaseFirestoreSwift
import FirebaseStorage
import Combine
First we declare the structure:
https://firebase.google.com/docs/firestore/manage-data/add-data#custom_objects
public struct MyObject: Codable {
let id: String
let code: String?
// Needed to identify them in Firestore
enum CodingKeys: String, CodingKey {
case id
case code = "code"
}
}
Now we access it and generate an Object for each document we can fetch that contains your desired value:
https://firebase.google.com/docs/firestore/query-data/get-data#custom_objects
var myArray: Array<MyObject> = [] // Empty array where we will store all objects in
var codeTextInput = "Test"
// Fetch only desired documents
let db = Firestore.firestore()
let docRef = db.collection("My Collection").whereField("Code", isEqualTo: codeTextInput)
func getDocumentsAsObjects() { // docRef.getDocuments Needs to be in function or else: Expressions are not allowed at the top level
docRef.getDocuments { (querySnapshot, err) in //getDocuments (s) as in multiple
if let err = err {
print("Error getting documents: \(err)")
} else {
for document in querySnapshot!.documents { // iterate them and add them to your array
let result = Result {
try document.data(as: MyObject.self)
}
switch result {
case .success(let myObject):
if let myObject = myObject {
myObject.id = document!.documentID // Get the ID of the Document as we might need it later
myArray.append(myObject) // Save the document into your array
} else {
// A nil value was successfully initialized from the DocumentSnapshot,
// or the DocumentSnapshot was nil.
print("Document does not exist")
}
case .failure(let error):
// A `MyObject` value could not be initialized from the DocumentSnapshot.
print("Error decoding city: \(error)")
}
}
}
}
}
Now you have your Objects in your array and can access them
Trying to query a document and then update it in a function in my ViewModel. Trying something like the below, but it doesn't work. Any advice would be appreciated!
func addToFruits(name: String) {
db.collection("fruits").whereField("name", isEqualTo: name)
.getDocument()
.limit(to: 1)
.updateData(["fruits": FieldValue.arrayUnion([name])])
}
func addToRoutine(routine: String, habit: String) {
db.collection("routines").whereField("name", isEqualTo: routine).getDocuments() { (querySnapshot, err) in
if let err = err {
print("Error getting documents: \(err)")
} else {
for document in querySnapshot!.documents {
document.updateData(["habits": FieldValue.arrayUnion([habit])])
}
}
}
}
In the first one, error I get is "Value of type 'Query' has no member 'getDocument'" and not sure how to resolve this. Second one, error I get is "Value of type 'QueryDocumentSnapshot' has no member 'updateData'"
It's not exactly clear what you're attempting to update but here's some quick example code that will read in a user named 'Steve' and update his age to 50. Keep in mind this will read in the FIRST user named 'Steve' and update their age - then when it's run again, will read the NEXT Steve etc etc - that may be what your attempting to do.
func readUsersAndUpdateTheirAgeTo50() {
let users = self.db.collection("users") //self.db points to *my* firestore
users.whereField("name", isEqualTo: "Steve").limit(to: 1).getDocuments(completion: { querySnapshot, error in
if let err = error {
print(err.localizedDescription)
return
}
guard let docs = querySnapshot?.documents else { return }
for doc in docs {
let docId = doc.documentID
let name = doc.get("name")
print(docId, name)
let ref = doc.reference
ref.updateData(["age": 20])
}
})
}
If I just wanted to update all Steve's age to 50, remove the limit
.limit(to: 1)
Note this code is kind of sloppy as since there is a limit of 1, we wouldn't need the loop. Also note that not every Steve is 50 so there should be additional parameters to narrow down which Steve it is - like a uid for example.
Below is the code for my signup page. I want to make it so that when someone creates an account on the sign up page, I create a document in the users collection and include uuid in the document. However, session.session?.uid ends up being nil. Does anyone know why this is?
struct SignUpView: View {
#State var email = ""
#State var password = ""
#State var name = ""
#State var error = ""
#EnvironmentObject var session: SessionStore
func signUp() {
let db = Firestore.firestore()
let user = db.collection("users").document()
let test = db.collection("users").document(user.documentID).collection("routines").document()
session.signUp(email: email, password: password) { (result, error) in
if let error = error {
self.error = error.localizedDescription
print("This is the error \(error)")
return
} else {
self.email = ""
self.password = ""
}
}
user.setData(["id": user.documentID, "email": email]) { (err) in
if err != nil {
print((err?.localizedDescription)!)
return
}
}
print(session.session?.uid)
test.setData(["id:": test.documentID, "msg": "samwell Tarly", "uuid": session.session?.uid]) { (err) in
print("ummmmm test data?")
if err != nil {
print((err?.localizedDescription)!)
return
}
}
}
The Firebase APIs are asynchronous, simply because they access a remote system, across the internet, which takes a little time. The same applies for accessing the local disk, by the way. This blog post explains this in more detail.
Consequently, session.signUp is an asynchronous process. I.e. the call to print(session.session?.uid) is executed before session.signUp returns. Thus, session.session?.uid is still nil.
To work around this, you can nest your calls like this:
session.signUp(email: email, password: password) { (result, error) in
if let error = error {
self.error = error.localizedDescription
print("This is the error \(error)")
return
}
else {
self.email = ""
self.password = ""
user.setData(["id": user.documentID, "email": email]) { (err) in
if err != nil {
print((err?.localizedDescription)!)
return
}
}
}
}
Generally speaking, I would strongly recommend to not perform so much logic in your views, but instead keep your views as anaemic as possible - meaning: put all your logic into view models, and bind the view to the view models by using Combine. This will make your code much cleaner, easier to test, and maintainable.
See https://peterfriese.dev/replicating-reminder-swiftui-firebase-part2/ for how to do this.
I've a cloud firebase result item:
let mpUserRef = db?.collection(MPUser.PROPERTY_DB)
.whereField(MPUser.PROPERTY_FIREBASE_USER_ID, isEqualTo: firebaseUSer.uid)
.limit(to: 1).getDocuments() { (document, err) in
if let err = err {
print("Error getting documents: \(err)")
} else {
for document in document!.documents {
let mpUser = fromJsonToMpUser( userJson: "\(document.data())" )
if mpUser != nil{
delegate.mpUser = mpUser
}
}
}
}
And i want to decode result item in my business Object calling the method:
class func fromJsonToMpUser( userJson: String ) -> MPUser?{
let decoder = JSONDecoder()
do{
let json = userJson.data(using: .utf8)!
let mpUser = try decoder.decode(MPUser.self, from: json)
return mpUser
}catch{
print("Errore while ecode Club")
return nil
}
}
But this does not work, the error message that i have is:
"The given data was not valid JSON.", underlyingError: Optional(Error Domain=NSCocoaErrorDomain Code=3840 "Badly formed array around character 17." UserInfo={NSDebugDescription=Badly formed array around character 17.}))).
So, how can i converte cloud firestore item result in valid Json?
I've resolved my question using CodableFirebase library ( https://github.com/alickbass/CodableFirebase created by #alickbass )