I'm trying to retrieve string key which I have saved it in the object
func retrieveData() {
let refAll = Database.database().reference().child("Playground")
refAll.observe(.value) { (snapshot) in
if let snapshotValue = snapshot.value as? [String:Any] {
var playgroundSnapshot = snapshotValue
let playgroundKeys = Array(playgroundSnapshot.keys)
self.playgroundArray.removeAll()
for key in playgroundKeys {
guard
let value = playgroundSnapshot[key] as? [String : Any]
else {
continue
}
let title = value["title"] as! String
let city = value["city"] as! String
let location = value["location"] as! String
let price = value["price"] as! String
let playground = Playground(title: title, price: price, location: location, city: city, availblePlayground: true)
self.playgroundArray.append(playground)
}
self.tabeView.reloadData()
}
}
}
and in the playgroundArray there is key for each object
keySelected = playgroundArray[indexPath.row].key
but I don't know why keySelected is nil even tho playgroundArray has objects
playgroundArray does not contain "key" . You have to set the Playground Struct. Add var key:String? and also add this to init() func.
let playground = Playground(title: title, price: price, location: location, city: city, availblePlayground: true)
to
let playground = Playground(title: title, price: price, location: location, city: city, availblePlayground: true, key: key)
self.playgroundArray.append(playground)
Related
I have a project in swift with Firestore for the database. My firestore dataset of a user looks like this. User details with an array that contains objects.
I have a function that gets the specifick user with all firestore data:
func fetchUser(){
db.collection("users").document(currentUser!.uid)
.getDocument { (snapshot, error ) in
do {
if let document = snapshot {
let id = document.documentID
let firstName = document.get("firstName") as? String ?? ""
let secondName = document.get("secondName") as? String ?? ""
let imageUrl = document.get("imageUrl") as? String ?? ""
let joinedDate = document.get("joinedDate") as? String ?? ""
let coins = document.get("coins") as? Int ?? 0
let challenges = document.get("activeChallenges") as? [Challenge] ?? []
let imageLink = URL(string: imageUrl)
let imageData = try? Data(contentsOf: imageLink!)
let image = UIImage(data: imageData!) as UIImage?
let arrayWithNoOptionals = document.get("activeChallenges").flatMap { $0 }
print("array without opt", arrayWithNoOptionals)
self.user = Account(id: id, firstName: firstName, secondName: secondName, email: "", password: "", profileImage: image ?? UIImage(), joinedDate: joinedDate, coins: coins, activeChallenges: challenges)
}
else {
print("Document does not exist")
}
}
catch {
fatalError()
}
}
}
This is what the user model looks like:
class Account {
var id: String?
var firstName: String?
var secondName: String?
var email: String?
var password: String?
var profileImage: UIImage?
var coins: Int?
var joinedDate: String?
var activeChallenges: [Challenge]?
init(id: String, firstName: String,secondName: String, email: String, password: String, profileImage: UIImage, joinedDate: String, coins: Int, activeChallenges: [Challenge]) {
self.id = id
self.firstName = firstName
self.secondName = secondName
self.email = email
self.password = password
self.profileImage = profileImage
self.joinedDate = joinedDate
self.coins = coins
self.activeChallenges = activeChallenges
}
init() {
}
}
The problem is I don't understand how to map the activeChallenges from firestore to the array of the model. When I try : let challenges = document.get("activeChallenges") as? [Challenge] ?? []
The print contains an empty array, but when i do: let arrayWithNoOptionals = document.get("activeChallenges").flatMap { $0 } print("array without opt", arrayWithNoOptionals)
This is the output of the flatmap:
it returns an optional array
System can not know that activeChallenges is array of Challenge object. So, you need to cast it to key-value type (Dictionary) first, then map it to Challenge object
let challengesDict = document.get("activeChallenges") as? [Dictionary<String: Any>] ?? [[:]]
let challenges = challengesDict.map { challengeDict in
let challenge = Challenge()
challenge.challengeId = challengeDict["challengeId"] as? String
...
return challenge
}
This is the same way that you cast snapshot(document) to Account object
I am new to Swift, but have some basic experience with Objective-C programming, and Swift seems much simpler.
However, I can't quite understand the struct thing. I followed a tutorial on how to use Firebase Realtime Database, and this tutorial were using a model to store the data.
But when I modified the struct with additional properties, the previously saved entries in the database is not showing up. I think it's because the model doesn't recognize the object in the database because it has different properties, but how can I make a property optional? So that old entries in the database with different structure (missing properties) are still valid and showing up?
Here is the model. The new property added is all the references to the description.
import Foundation
import Firebase
struct InsuranceItem {
let ref: DatabaseReference?
let key: String
let name: String
let timestamp: Int
let itemValue: Int
let description: String?
let userId: String?
init(name: String, timestamp: Int, itemValue: Int = 0, description: String = "", userId: String, key: String = "") {
self.ref = nil
self.key = key
self.name = name
self.timestamp = Int(Date().timeIntervalSince1970)
self.itemValue = itemValue
self.description = description
self.userId = userId
}
init?(snapshot: DataSnapshot) {
guard
let value = snapshot.value as? [String: AnyObject],
let name = value["name"] as? String,
let timestamp = value["timestamp"] as? Int,
let itemValue = value["itemValue"] as? Int,
let description = value["description"] as? String,
let userId = value["userId"] as? String else { return nil }
self.ref = snapshot.ref
self.key = snapshot.key
self.name = name
self.timestamp = timestamp
self.itemValue = itemValue
self.description = description
self.userId = userId
}
func toAnyObject() -> Any {
return [
"name": name,
"timestamp": timestamp,
"itemValue": itemValue,
"description": description!,
"userId": userId!
]
}
}
The problematic bit is your failable init, init?(snapshot: DataSnapshot). You fail the init even if an Optional property is missing, which is incorrect. You should only include the non-Optional properties in your guard statement, all others should simply be assigned with the optional casted value.
init?(snapshot: DataSnapshot) {
guard
let value = snapshot.value as? [String: Any],
let name = value["name"] as? String,
let timestamp = value["timestamp"] as? Int,
let itemValue = value["itemValue"] as? Int else { return nil }
self.ref = snapshot.ref
self.key = snapshot.key
self.name = name
self.timestamp = timestamp
self.itemValue = itemValue
// Optional properties
let description = value["description"] as? String
let userId = value["userId"] as? String
self.description = description
self.userId = userId
}
Unrelated to your question, but your toAnyObject function is unsafe, since you are force-unwrapping Optional values. Simply keep them as Optionals without any unwrapping and add as Any to silence the warning for implicit coersion.
func toAnyObject() -> Any {
return [
"name": name,
"timestamp": timestamp,
"itemValue": itemValue,
"description": description as Any,
"userId": userId as Any
]
}
I want to read all three data sourcing from "Arts & Humanities" and "Beauty & Style". Is this possible?
Let ref = Database.database().reference().child("posts")
//CODE A: Pulls 2 snapshot, but doesn't display anything
let ref = Database.database().reference().child("posts").child("Arts & Humanities")
//CODE B: only pulls up the two feeds but excludes beauty and style. Vice versa
//Below is the listener code I have. This works only works with CODE B above; but ideally id like to read the post under "Beauty & Style" as well.
postsRef.observeSingleEvent(of: .value, with: { snapshot in
var tempPosts = [PostModel]()
for child in snapshot.children {
print(snapshot.childrenCount)
if let childSnapshot = child as? DataSnapshot,
let dict = childSnapshot.value as? [String:Any],
let author = dict["author"] as? [String:Any],
let uid = author["uid"] as? String,
let username = author["username"] as? String,
let fullname = author["fullname"] as? String,
let patthToImage = author["patthToImage"] as? String,
let url = URL(string:patthToImage),
let pathToImage = dict["pathToImage"] as? String,
let likes = dict["likes"] as? Int,
let postID = dict["postID"] as? String,
let message = dict["message"] as? String,
let genre = dict["genre"] as? String,
let timestamp = dict["timestamp"] as? Double {
if childSnapshot.key != lastPost?.id {
let userProfile = UserProfile(uid: uid, fullname: fullname, username: username, patthToImage: url)
let post = PostModel(genre: genre, likes: likes, message: message, pathToImage: pathToImage, postID: postID, userID: pathToImage, timestamp: timestamp, id: childSnapshot.key, author: userProfile)
tempPosts.insert(post, at: 0)
if lastPost?.id != nil {
lastPostIdChecker = lastPost!.id
}
}
}
}
return completion(tempPosts)
})
Here is the output of "print(dict)"...
["2018-10-17 11:19:51": {
firstname = Brooke;
id = 40vI7hApqkfX75SWsqIR6cdt7xV2;
lastname = Alvarez;
message = hshahyzhshbsbvash;
username = poiii;
}]
["2018-10-17 11:20:31": {
firstname = Trevor;
id = 40vI7hApqkfX75SWsqIR6cdt7xV2;
lastname = Bellai;
message = hey;
username = br9n;
}]
["2018-10-17 11:20:44": {
firstname = Amy;
id = 40vI7hApqkfX75SWsqIR6cdt7xV2;
lastname = Ikk;
message = hey;
username = nine9;
}]
My code...
Database.database().reference().child("recent-msgs").child(uid!).observe(.childAdded) { (snapshot: DataSnapshot) in
if let dict = snapshot.value as? [String: Any] {
print(dict)
// Store data in user.swift model
let firstnameData = dict[0]["firstname"] as! String
let idData = dict["id"] as! String
let lastnameData = dict["lastname"] as! String
let messageData = dict["message"] as! String
let usernameData = dict["username"] as! String
let rankData = dict["rank"] as! String
let propicrefData = dict["propicref"] as! String
let convoinfo = RecentConvo(firstnameString: firstnameData, idString: idData, lastnameString: lastnameData, messageString: messageData, usernameString: usernameData, rankString: rankData, propicrefString: propicrefData)
self.recentconvos.append(convoinfo)
print(self.recentconvos)
self.tableView.reloadData()
}
}
I'm trying to retrieve the dictionary within the first dictionary which is the value to the key which is the date associate with it. For example: 2018-10-17 11:19:51. However I cannot use this exact string to call it because I must do this without the knowledge of that string.
I tried this:
let firstnameData = dict[0]["firstname"] as! String
But it returns an error:
Cannot subscript a value of type '[String : Any]' with an index of type 'Int'
The error noted above is showing up because you were trying to access the element at a certain position (0) from the dictionary. Dictionaries are not ordered lists, and hence won't have a fixed order of elements to be accessed.
The logged dictionary doesn't really look like a dictionary. Assuming that it is a dictionary, and its keys are the date strings, you can use the following code snippet to parse the dictionary.
class RecentConversation {
var id: String?
var firstName: String?
var lastName: String?
var message: String?
var username: String?
var rank: String?
var propicref: String?
init?(dictionary: [String: Any]?) {
guard let dict = dictionary else {
// Return nil in case the dictionary passed on is nil
return nil
}
id = dict["id"] as? String
firstName = dict["firstname"] as? String
lastName = dict["lastname"] as? String
message = dict["message"] as? String
username = dict["username"] as? String
rank = dict["rank"] as? String
propicref = dict["propicref"] as? String
}
}
Usage:
let dateStrings = dict.keys.sorted {
// Sort in chronological order (based on the date string; if you need to sort based on the proper date,
// convert the date string to Date object and compare the same).
//
// Swap the line to $0 > $1 to sort the items reverse chronologically.
return $0 < $1
}
var conversations: [RecentConversation] = []
for date in dateStrings {
if let conversation = RecentConversation(dictionary: (dict[date] as? [String: Any])) {
conversations.append(conversation)
}
}
You were all very helpful, so I would like to start off by saying thank you. I went ahead and applied the method that lionserdar explained. (.allKeys)
// Fetch Recent Messages
func fetchRecentMsgs() {
// Direct to database child
Database.database().reference().child("recent-msgs").child(uid!).observe(.childAdded) { (snapshot: DataSnapshot) in
if let dict = snapshot.value as? NSDictionary {
print(dict)
print(dict.allKeys)
let keys = dict.allKeys
for key in keys {
print(key)
if let nestedDict = dict[key] as? [String: Any] {
print(nestedDict)
let firstnameData = nestedDict["firstname"] as! String
let idData = nestedDict["id"] as! String
let lastnameData = nestedDict["lastname"] as! String
let messageData = nestedDict["message"] as! String
let usernameData = nestedDict["username"] as! String
Worked for me so I hope this will help others too!
Is possible to avoid duplicating of cell with content of the same name during import customer from database to tableview? In my example if customer Ben Smith has two children with values I want only one cell with his name.
This is my database structure...
And result in tableview:
let userID = Auth.auth().currentUser!.uid
let usersDatabaseRef = Database.database().reference().child("usersDatabase").child(userID).child("Customers")
usersDatabaseRef.observe(.value, with: { snapshot in
print("there are \(snapshot.childrenCount) users")
for child in snapshot.children {
let childSnap = child as! DataSnapshot
print("user: \(childSnap.key)")
let userCustomerSnap = childSnap
for customer in userCustomerSnap.children.allObjects as! [DataSnapshot] {
let customerSnap = customer
let dict = customerSnap.value as! [String: Any]
let name = dict["Name and surname"]
let phone = dict["Phone"]
let company = dict["Company name"]
let customerID = dict["ID"]
let email = dict["Email"]
let nip = dict["Nip1"]
let postal = dict["Postal code"]
let street = dict["Street"]
let town = dict["Town"]
let myCustomer = CustomerModel(name: name as? String, phone: phone as? String, company: company as? String, customerID: customerID as? String, email: email as? String, nip: nip as? String, postal: postal as? String, street: street as? String, town: town as? String)
self.candies.append(myCustomer)
self.filteredCandies.append(myCustomer)
}
self.tableViewCustomer.reloadData()
You're adding an item to the list each time you find an order (or whatever the level under "Ben Smith" represents in your data) from that customer. So your list is a list of orders, not a list of customers.
In general in NoSQL/Firebase, it is recommended to model your database for what you want to display. So if you want a list of customers, that's what I'd store in the database. But given your data structure, you can also fix it in code:
usersDatabaseRef.observe(.value, with: { snapshot in
print("there are \(snapshot.childrenCount) users")
for child in snapshot.children {
let childSnap = child as! DataSnapshot
let myCustomer = CustomerModel(name: child.key, phone: "", company: "", customerID: "", email: "", nip: "", postal: "", street: "", town: ")
self.candies.append(myCustomer)
self.filteredCandies.append(myCustomer)
}
self.tableViewCustomer.reloadData()
})
Or alternatively, only add the new customer when their name is different from the previous order you saw:
var previousName: String = ""
usersDatabaseRef.observe(.value, with: { snapshot in
print("there are \(snapshot.childrenCount) users")
for child in snapshot.children {
let childSnap = child as! DataSnapshot
print("user: \(childSnap.key)")
let userCustomerSnap = childSnap
for customer in userCustomerSnap.children.allObjects as! [DataSnapshot] {
let customerSnap = customer
let dict = customerSnap.value as! [String: Any]
let name = dict["Name and surname"]
if name != previousName {
let phone = dict["Phone"]
let company = dict["Company name"]
let customerID = dict["ID"]
let email = dict["Email"]
let nip = dict["Nip1"]
let postal = dict["Postal code"]
let street = dict["Street"]
let town = dict["Town"]
let myCustomer = CustomerModel(name: name as? String, phone: phone as? String, company: company as? String, customerID: customerID as? String, email: email as? String, nip: nip as? String, postal: postal as? String, street: street as? String, town: town as? String)
self.candies.append(myCustomer)
self.filteredCandies.append(myCustomer)
previousName = name
}
}
}
self.tableViewCustomer.reloadData()
You really don't need that for loop. That might be what's causing you issue. The code is called for the same number of times that you have children anyway so you don't need that loop. Try the code below. If that doesn't work, you might need to try .childAdded instead of .value
guard let userID = Auth.auth().currentUser?.uid else { return }
let usersDatabaseRef = Database.database().reference().child("usersDatabase").child(userID).child("Customers")
usersDatabaseRef.observe(.childAdded, with: { snapshot in
guard let dict = snapshot.value as? [String: Any] else { return }
let name = dict["Name and surname"] as? String
let phone = dict["Phone"] as? String
let company = dict["Company name"] as? String
let customerID = dict["ID"] as? String
let email = dict["Email"] as? String
let nip = dict["Nip1"] as? String
let postal = dict["Postal code"] as? String
let street = dict["Street"] as? String
let town = dict["Town"] as? String
let myCustomer = CustomerModel(name: name, phone: phone, company: company, customerID: customerID, email: email, nip: nip, postal: postal, street: street, town: town)
self.candies.append(myCustomer)
self.filteredCandies.append(myCustomer)
DispatchQueue.main.async {
self.tableViewCustomer.reloadData()
}
}, withCancel: nil)