After logging into the app, in a settings page, SettingsViewController, I would like for the user to be able to see their information in a text view. However, no matter the approach to reading the data, i always get the Swift Compiler Warning:
Cast from '[String]' to unrelated type 'String' always fails
This is my code:
func textViewFill() {
let db = Firestore.firestore()
db.collection("users").getDocuments() { (querySnapshot, err) in
if let err = err {
print("Error getting documents: \(err)")
} else {
for document in querySnapshot!.documents {
print("\(document.documentID) => \(document.data())")
let firstName = ["firstName"] as? String ?? ""
let lastName = ["lastName"] as? String ?? ""
let email = ["email"] as? String ?? ""
self.firstNameTextView.text = firstName
self.lastNameTextView.text = lastName
self.emailTextView.text = email
}
}
}
}
The warning appears for when I am trying to define the documents as strings:
let firstName = ["firstName"] as? String ?? ""
let lastName = ["lastName"] as? String ?? ""
let email = ["email"] as? String ?? ""
Is there no way to display it as text?
You're trying to cast an Array as String here. Here's what you need:
let firstName = document.get("firstName") as? String ?? ""
let lastName = document.get("lastName") as? String ?? ""
let email = document.get("email") as? String ?? ""
You can use if let to unwrap optionals and dont cast Array as string .. it will always fails..
func textViewFill() {
let db = Firestore.firestore()
db.collection("users").getDocuments() { (querySnapshot, err) in
if let err = err {
print("Error getting documents: \(err)")
} else {
if let document = querySnapshot!.documents.first {
print("\(document.documentID) => \(document.data())")
if let firstName = document.get("firstName") as? String ,
let lastName = document.get("lastName") as? String,
let email = document.get("email") as? String {
self.firstNameTextView.text = firstName
self.lastNameTextView.text = lastName
self.emailTextView.text = email
}
}
}
}
}
Related
Please help! I am experiencing an app crash.
public enum memberships {
case noMembership
case paid
case freeTrial
case trialExpired
}
public class DataManager {
private static let uuid = UIDevice.current.identifierForVendor!.uuidString
private static let user = Auth.auth().currentUser
private static let userRef = Database.database().reference().child("Users").child(user?.uid ?? "")
static var currentStatus: memberships? = nil
/**
Get's the current user's info from Firebase
and returns the info as a User object
*/
class func getUser(completion: #escaping (User?) -> ()) {
userRef.observeSingleEvent(of: .value, with: { (snapshot) in
if let value = snapshot.value as? [String: Any] {
// UIPasteboard.general.string = uuid
let uuid = snapshot.key
let name = value["name"] as? String ?? ""
let email = value["email"] as? String ?? ""
let dateJoined = value["dateJoined"] as? String ?? ""
let membershipString = value["membership"] as? String
let alertsStartTime = value["alertsStartTime"] as? String ?? ""
let alertsEndTime = value["alertsEndTime"] as? String ?? ""
let alertsFrequency = value["alertsFrequency"] as? Int ?? 1
let alertsType = value["alertsType"] as? String ?? ""
let isEnable = value["isEnable"] as? Bool ?? true
//Gets users current membership
var membershipStatus: memberships!
if membershipString == "Paid" {
membershipStatus = .paid
}else if membershipString == "NoMembership" {
membershipStatus = .noMembership
}else{
membershipStatus = Utils.getUserMembershipStatus(dateJoined: dateJoined)
}
let user = User(uuid: uuid, name: name, email: email, dateJoined: dateJoined, membership: membershipStatus, alertsStartTime: alertsStartTime, alertsEndTime: alertsEndTime, alertsType: alertsType, alertsFrequency: alertsFrequency, isEnable: isEnable)
completion(user)
}else{
completion(nil)
}
}) { (error) in
print(error.localizedDescription)
completion(nil)
}
}
Your user object is empty. So user?.uid is nil. Which means child(user?.uid ?? "") -> child("").
Firebase does not accept empty strings as key values (It also does not accepts strings which includes '.' '#' '$' '[' or ']'' as keys).
So in your case make sure user is logged or use different key value.
I am trying to get data from firestore collection and assign it to an array of dictionaries. for this part of the code below... i get the error "Cast from 'QuerySnapshot?' to unrelated type '[[String : Any]]' always fails" and the console prints "is not working".
guard let snap = snapshot as? [[String:Any]] else {
print("is not working")
completion(.failure(DatabaseError.failedToFetch))
return
}
Here is the full code.
// fetches and returns all conversations for the user with passed in uid
public func getAllConversations(for uid: String, completion: #escaping(Result<[Conversation], Error>) -> Void) {
print("fetching all convos")
//NEW
let db = Firestore.firestore()
let CurrentUser = Auth.auth().currentUser?.uid
let ListRef = db.collection("users").document(CurrentUser!).collection("conversations")
// fetch the current users convo list
ListRef.getDocuments { snapshot, error in
if let err = error {
debugPrint("Error fetching documents: \(err)")
} else {
guard let snap = snapshot as? [[String:Any]] else {
print("is not working")
completion(.failure(DatabaseError.failedToFetch))
return
}
print("is working")
let conversations: [Conversation] = snap.compactMap({ dictionary in
guard let id = dictionary["id"] as? String,
let name = dictionary["name"] as? String,
let otherUserUID = dictionary["other_user-uid"] as? String,
let latestMessage = dictionary["latest-message"] as? [String:Any],
let date = latestMessage["date"] as? String,
let message = latestMessage["message"] as? String,
let isRead = latestMessage["is-read"] as? Bool else {
return nil
}
//save other user ID to a global var
self.test = otherUserUID
//assign data into an array of dictionaries
let latestConvoObject = LatestMessage(date: date, text: message, isRead: isRead)
return Conversation(id: id, name: name, otherUserUid: otherUserUID, latestMessage: latestConvoObject)
})
completion(.success(conversations))
}
}
}
There are a numbers of way to read that data, and the process can be simplified by conforming objects to the codable protocol but let me provide a straight forward example. I don't know what your Conversation object looks like so here's mine
class ConversationClass {
var from = ""
var to = ""
var msg = ""
var timestamp = 0
convenience init(withDoc: DocumentSnapshot) {
self.init()
self.from = withDoc.get("from") as? String ?? "no from"
self.to = withDoc.get("to") as? String ?? "no to"
self.msg = withDoc.get("msg") as? String ?? "no msg"
self.timestamp = withDoc.get("timestamp") as? Int ?? 0
}
}
and then here's the the code that reads in all the conversation documents from a Collection, stores each in a ConversationClass object, puts those in an array and returns it through an escaping completion handler
func getConversations(completion: #escaping( [ConversationClass] ) -> Void) {
let conversationCollection = self.db.collection("conversations")
conversationCollection.getDocuments(completion: { snapshot, error in
if let err = error {
print(err.localizedDescription)
return
}
guard let docs = snapshot?.documents else { return }
var convoArray = [ConversationClass]()
for doc in docs {
let convo = ConversationClass(withDoc: doc)
convoArray.append(convo)
}
completion(convoArray)
})
}
I wonder how to get an Dictionary from my Firestore. For normal Arrays I've done it like that:
func returnArray(){
let newpath = Firestore.firestore().collection(path)
newpath.addSnapshotListener { (querySnapshot, error) in
guard let documents = querySnapshot?.documents else {
return
}
self.Array = documents.map { (queryDocumentSnapshot) -> String in
let data = queryDocumentSnapshot.data()
let Name = data["myField"] as? String ?? ""
return Name
}
}
}
That works perfectly fine. My question is now how I have to change my code that its getting an Array out of the Firebase. I had an idea, but it doesn't work:
func returnDictionary(){
let newpath = Firestore.firestore().collection(path)
newpath.addSnapshotListener { (querySnapshot, error) in
guard let documents = querySnapshot?.documents else {
return
}
self.Dictionary = documents.map { (queryDocumentSnapshot) -> // I don't know what to fill here
in
let data = queryDocumentSnapshot.data()
let Name = data["AnzeigeName"] as? String ?? ""
let ID = data["selfID"] as? String ?? ""
return ID: Name
}
}
}
What can I try next?
.map is going to give you an array, but you can use Dictionary's init(uniqueKeysWithValues:) to turn this into a Dictionary:
let dictionary : Dictionary<String,String> = .init(uniqueKeysWithValues: documents.compactMap { queryDocumentSnapshot -> (String,String)? in
let data = queryDocumentSnapshot.data()
if let name = data["AnzeigeName"] as? String, let id = data["selfID"] as? String {
return (id, name)
}
return nil
})
It's important to know that uniqueKeysWithValues will crash if the keys are not in fact unique, so you'd want to check for that first (look at #New Dev's comment about init(_:uniquingKeysWith:) to handle this). I'm also using compactMap to get rid of nil values.
(Note: In Swift, generally variable names are lowercased and type names are uppercased. Going against that pattern can make your code challenging to read for others)
Firestore Example
{
name: "Anonymous"
pet {
name: "Max"
age: "3"
}
}
Query
Firebase.firestore().collection(path).getDocuments { querySnapshot, error in
if let error = error {
print(error.localizedDescription)
} else {
for document in querySnapshot!.documents {
let data = document.data()
let name = data["name"]
let pet = data["pet"] as! Dictionary<String, String>
print("Name: \(name)")
print("Pet-name: \(pet["name"]!)")
print("Pet-age: \(pet["age"]!)")
}
Completion Func to get data from firestore
struct User {
let docID: String
let firstName: String
}
var userArray = [User]()
// ...
//....
func getUserData(completion: #escaping ([User]) -> Void) {
var result = [User]()
guard let userID = Auth.auth().currentUser?.uid else {return}
let db = Firestore.firestore()
db.collection("users").whereField("uid", isEqualTo: userID)
.getDocuments() { (querySnapshot, err) in
if let err = err {
print("Error getting documents: \(err)")
completion(result)
return
}
else {
if let snapshot = querySnapshot {
for document in snapshot.documents {
let data = document.data()
let docid = data["docID"] as? String ?? ""
let firstName = data["firstName"] as? String ?? ""
let lastName = data["lastName"] as? String ?? ""
let email = data["email"] as? String ?? ""
let UData = User(docID: docid, firstName: firstName)
result.append(UData)
print(result)
}
}
} //end ELSE
completion(result)
}
}
Calling it here in viewWillAppear
override func viewWillAppear(_ animated: Bool) {
getUserData{ (result) in
self.userArray.append(contentsOf: result)
print(self.userArray)
}
}
Prints the following
[DaDoc.HomeViewController.User(docID: "avGhsRI1x0c", firstName: "Raul")]
Question
Why is "DaDoc.HomeViewController.User" This being appended to the array?
i can't unwrap it with "!" throws an error "Cannot force unwrap value of non-optional type '[HomeViewController.User]'"
How can i access keys in here (docID, firstName)
[DaDoc.HomeViewController.User(docID: "avGhsRI1x0c", firstName: "Raul")]
Anyhelp is appreciated!
UPDATE:
Thanks for the suggestions #jawadAli - Moving struct outside the class worked
Even thought my result still printed as below
[DaDoc.User(docID: "avGhsRI1x0c", firstName: "Raul")].
I was able to access keys to add to values to a tableView like below:
cell.firstNameLabel?.text = userArray[indexPath.row].firstName
I have two structs, one nested within the other:
struct User {
let uid: String
let name: String
var pack: [Doggo]
}
struct Doggo {
let dogUid: String
let dogName: String
let dogBreed: String
let dogBorn: String
let dogProfileImageURL: String
}
Is the following code the proper way to access the firebase data for each?
guard let userUid = Auth.auth().currentUser?.uid else { return }
let userRef = self.db.collection("users").document(userUid)
let packRef = self.db.collection("users").document(userUid).collection("pack")
userRef.getDocument { (document, error) in
if let document = document, document.exists {
let data = document.data()
let name = data?["name"] as? String ?? "Anonymous"
packRef.getDocuments(completion: { (snapshot, error) in
if let err = error {
debugPrint("Error fetchings docs: \(err)")
} else {
guard let snap = snapshot else { return }
for document in snap.documents {
let data = document.data()
let dogUid = data["dogUid"] as? String ?? "No dogUid"
let dogName = data["dogName"] as? String ?? "No dogName"
let dogBreed = data["dogBreed"] as? String ?? "No dogBreed"
let dogBorn = data["dogBorn"] as? String ?? "No dogBorn"
let dogProfileImageURL = data["dogProfileImageURL"] as? String ?? "No dogProfileImageURL"
let newDoggo = Doggo(dogUid: dogUid, dogName: dogName, dogBreed: dogBreed, dogBorn: dogBorn, dogProfileImageURL: dogProfileImageURL)
self.doggos.append(newDoggo)
print(newDoggo)
}
}
self.user = User(uid: userUid, name: name, pack: self.doggos)
print(self.user)
self.configureHomeController()
self.configureMenuController()
})
} else {
print("Document does not exist")
}
}
It appears to work the way I'd like it to, but I don't want to run into issues down the line as it's quite foundational to the rest of the app.