I'm trying to observe information from my firebase database and store it in a dictionary, the problem is when I try to show these data on a label it takes a lot of time about 30 seconds, can you solve it please.
#objc func fetchUser() {
let user = Auth.auth().currentUser
if let user = user {
let uid = user.uid
let email = user.email
ref?.child("users").child(uid).observeSingleEvent(of: .value, with: { (snapshot) in
if let dictionary = snapshot.value as? [String : AnyObject] {
print(dictionary)
self.disName.text! = dictionary["DisplayName"] as! String
}
})
disUID.text = uid
disEmail.text = email
}
}
Related
I don't know why cant find how get friends Ids.
her is my code:
func fetchUsers() {
let ref = Firebase.Database.database().reference()
guard let userId = Auth.auth().currentUser?.uid else { return }
let userID = userId
ref.child("Users").child(userID).observe(.childAdded) { (snapshot) in
print("snapshot...\(snapshot)")
let user = User()
if let dictionary = snapshot.value as? [String:AnyObject]{
user.currentUserFriends = dictionary["Friends"] as? String
print("dictionary...\(user.currentUserFriends ?? "no value")")
}
}
}
and my tree from firebase is Users-Uid-Friends-friendID-true.
Solved!
ref.child("Users").child(userID!).child("Friends").observeSingleEvent(of: .value) { (snapshot) in
print("snapshot...\(snapshot)")
let dic = snapshot.value as! NSDictionary
for (key,value) in dic{
let friendsID = key
let friendBool = value
print("key is \(friendsID) and value is \(friendBool)")
let user = User()
user.currentUserFriends = key as? String
}
}
I'm kinda new on swift programming, my case is:
I have a database on firebase realtime "see picture", I want to retrieve the firstName and lastName data of a specific ID only.
for example:
When i'm at login screen and logged in using this email: "ali_y_k#hotmail.com", and when going to the next screen i want to display the firstName and lastName of this email in the text fields showing on picture
I have tried several solutions but the problem always was I can't enter the random IDs child to fetch the firstName and lastName
there is what i tried:
First
func retriveInfo () {
let databaseRef = Database.database().reference().child("User_Informations")
databaseRef.observe(.childAdded) { (snapshot) in
let snapshotValue = snapshot.value as! Dictionary<String,String>
let firstName = snapshotValue["firstName"]!
let lastName = snapshotValue["lastName"]!
let email = snapshotValue["email"]!
print(firstName,lastName,email)
}
}
This is printing all data (firstName,lastName,email) from every id
Second
func retriveInfo() {
let databaseRef = Database.database().reference().child("User_Informations")
databaseRef.observeSingleEvent(of: .value, with: { (snapshot) in
for snap in snapshot.children {
let userSnap = snap as! DataSnapshot
let uid = userSnap.key //the uid of each user
let userDict = userSnap.value as! [String:AnyObject] //child data
let firstName = userDict["firstName"] as! String
let lastName = userDict["lastName"] as! String
print("key = \(uid) First Name = \(firstName), Last Name = \(lastName)")
}
})
This will print every key "Id" and all the info
Thank You in advance :)
Since you have childByAutoId you have to use query ordered and query equal.
let reference = Database.database().reference().child("User_Informations").queryOrdered(byChild: "email")
reference.queryEqual(toValue: "ali_y_k#hotmail.com").observeSingleEvent(of: .childAdded) { (snapshot) in
let dictionary = snapshot.value as! [String : Any]
let firstName = dictionary["firstName"]
print(firstName)
}
You need to use the current user id after you login
let currentUserUid = FIRAuth.auth()!.currentUser!.uid
let databaseRef = Database.database().reference().child("User_Informations/\(currentUserUid)")
databaseRef.observeSingleEvent(of: .value, with: { (snapshot) in
}
I've got a code which normally should return to me a value from Firebase.
My Firebase struct is :
Experience{
UserId{
LDG_DAY: "4"
LDG_NIGHT: "0"
APCH_IFR: "0"
}
}
My code is :
func getUserExp(){
let ref = Database.database().reference()
let userID = Auth.auth().currentUser?.uid
let Date = self.flightDate.text
ref.child("Experience")/*.child(userID!)*/.observeSingleEvent(of: .value) {(snapshot) in
if snapshot.hasChild(userID!){
let value = snapshot.value as? NSDictionary
let ldg_day = value?["LDG_DAY"] as? String ?? "123"
let ldg_night = value?["LDG_NIGHT"] as? String ?? "0"
let apch_ifr = value?["APCH_IFR"] as? String ?? "0"
self.intLdgDay = Int(ldg_day)!
self.intLdgNight = Int(ldg_night)!
self.intApchIfr = Int(apch_ifr)!
print("string = \(ldg_day) int = \(self.intLdgDay)")
}
}
}
Now the code didn't work as I would like... In fact my code return the basic as? String ?? "123" value but the snapshot.value get the good value from firebase ...
What's wrong ? I use this code for many other part of my app and no problems about it ?
Thanks for your help
I believe you want to ensure the node exists before trying to read the child data.
NOTE:
I see the path to read has the uid commented out so it's unclear if you intended to read a single user (leaving in the uid) or if you actually wanted to load every user at one time (thousands). This answer assumes you are intending to read that specific user node only. See #Callam answer if you intended to read ALL of the users nodes at one time.
The code you have now is using snapshot.hasChild which looks within the node to see if the child, the users uid exists, and it doesn't so the code will always fail.
if snapshot.hasChild(userID!)
I think what you want to do is use snapshot.exists to ensure it's a valid node before reading. Here's the code:
let experienceRef = self.ref.child("Experience")
let usersExpRef = experienceRef.child(uid)
usersExpRef.observeSingleEvent(of: .value) { snapshot in
if snapshot.exists() {
let value = snapshot.value as! [String: Any]
let ldg_day = value["LDG_DAY"] as? String ?? "123"
print("string = \(ldg_day)")
} else {
print("the \(uid) node does not exist")
}
}
I would also suggest safely unwrapping options before attempting to work with them as they could be nil, and that would crash your code.
guard let thisUser = Auth.auth().currentUser else { return }
let uid = thisUser.uid
Note I also replaced the old objc NSDictionary with it's Swifty counterpart [String: Any]
Assuming your struct is from the root, and Experience contains more than one user ID, your code is currently observing the value for all user IDs since the /*.child(userID!)*/ is commented out.
Therefore you are requesting every user's experience and checking on the client if the current user exists as a child – this will succeed if the current user's ID is present at Experience/$uid.
ref.child("Experience")/*.child(userID!)*/.observeSingleEvent(of: .value) { (snapshot) in
if snapshot.hasChild(userID!) {
let value = snapshot.value as? NSDictionary
Now we have a snapshot with all Experiences and we've confirmed that it has a child for the current user's ID – we would need to get that child and cast the value of that to a dictionary.
let value = snapshot.childSnapshot(forPath: userID).value as? NSDictionary
This fixes the issue but obviously, we don't want to download every experience on a single user's device, and they maybe shouldn't even have the permission to request that reference location either.
So if you uncomment .child(userID!), the snapshot will be of just one Experience, so snapshot.hasChild(userID!) will fail. Instead, you can use snapshot.exists() and/or a conditional cast to determine if the snapshot for the userID is existent and/or thereby castable.
func getUserExp() {
let ref = Database.database().reference()
let userID = Auth.auth().currentUser?.uid
let Date = self.flightDate.text
ref.child("Experience").child(userID!).observeSingleEvent(of: .value) { snapshot in
if snapshot.exists() {
let value = snapshot.value as? [String:String]
let ldg_day = value?["LDG_DAY"] ?? "123"
let ldg_night = value?["LDG_NIGHT"] ?? "0"
let apch_ifr = value?["APCH_IFR"] ?? "0"
self?.intLdgDay = Int(ldg_day)!
self?.intLdgNight = Int(ldg_night)!
self?.intApchIfr = Int(apch_ifr)!
print("string = \(ldg_day) int = \(self.intLdgDay)")
} else {
print("experience for \(snapshot.key) doesn't exist")
}
}
}
You can clean this up a bit with a struct and extension.
// Experience.swift
struct Experience {
var ldg_day: String
var ldg_night: String
var apch_ifr: String
}
extension Experience {
static var currentUserRef: DatabaseReference? {
return Auth.auth().currentUser.flatMap {
return Database.database().reference(withPath: "Experience/\($0.uid)")
}
}
init?(snapshot: DataSnapshot) {
guard snapshot.exists() else { return nil }
let value = snapshot.value as? [String:String]
self.ldg_day = value?["LDG_DAY"] ?? "123"
self.ldg_night = value?["LDG_NIGHT"] ?? "0"
self.apch_ifr = value?["APCH_IFR"] ?? "0"
}
}
Et voilà,
func getUserExp() {
Experience.currentUserRef?.observeSingleEvent(of: .value, with: { [weak self] in
if let experience = Experience(snapshot: $0) {
self?.intLdgDay = Int(experience.ldg_day)!
self?.intLdgNight = Int(experience.ldg_night)!
self?.intApchIfr = Int(experience.apch_ifr)!
print("string = \(experience.ldg_day) int = \(self.intLdgDay)")
} else {
print("experience for \($0.key) doesn't exist")
}
})
}
I am beginner and I would like to use swift as my programming language.
user can add register users and transfer money to each other, therefore when user type the photo number and email, the app can check if the typed number is registered in the firebase system
Any simple way to search if the user exist, thanks a lot
Here's the structure of the database
var ref: DatabaseReference!
var tref: DatabaseReference!
var handle : DatabaseHandle!
var usersArray = [NSDictionary?]()
var filteredUsers = [NSDictionary?]()
var user : NSDictionary?
override func viewDidLoad() {
super.viewDidLoad()
self.picker.isHidden = true
tref = Database.database().reference()
ref = Database.database().reference()
self.handle = self.ref?.child("users").child((Auth.auth().currentUser?.uid)!).child("contact").observe(.childAdded, with: { (snapshot) in
if let item = snapshot.value as? String {
self.pickerdata.append(item)
self.picker.reloadAllComponents()
}
})
self.picker.delegate = self
self.picker.dataSource = self
tref.child("users").queryOrdered(byChild: "phone").observe(.childAdded, with: {(snapshot) in
self.usersArray.append(snapshot.value as? NSDictionary)
})
print(usersArray.count)
}
#IBAction func ContactChange(_ sender: UITextField) {
filteredContent(searchText: contactText.text!)
print(filteredUsers.count)
print(usersArray.count)
print("ARRAY")
}
func filteredContent(searchText: String){
self.filteredUsers = self.usersArray.filter{ user in
let username = user!["phone"] as? String
return (username?.lowercased().contains(searchText.lowercased()))!
}
}
func findUsers(text: String){
self.handle = ref.child("users").queryOrdered(byChild: "phone").queryStarting(atValue: contactText.text!).queryEnding(atValue: contactText.text!+"\u{f8ff}").observe(.value, with: { snapshot in
if let item = snapshot.value as? String {
self.contact.append(item)
} else{
print("error")
}
})
}
The code above doesn't work much. Thanks so much for helping
The question is a little unclear but I think what the OP is asking is:
how to see if a user exists by their phone number?
If that's what's being asked, a node can be retrieved by query'ing for a child of that node. For example, let's create a query on the users node to find the child that contains the name: Kam querying by phone
let usersRef = firebaseRef.child("users")
let query = usersRef.queryOrdered(byChild: "phone").queryEqual(toValue: "2330504")
query.observeSingleEvent(of: .value) { (snapshot) in
if snapshot.exists() {
//need to iterate in case we find more than one match
for child in snapshot.children {
let snap = child as! DataSnapshot
let dict = snap.value as! [String: Any]
let name = dict["name"] as! String
print("found \(name)")
}
} else {
print("not found")
}
}
When this code is run it would print
found Kam
assuming the phone number is 2330504
I have been on this issue for over three days, i have research and came across other similar questions on SO which relates to my issue but those fix could not solve mine hence the reason am asking this question.
I have a users, posts and users-posts node in firebase as shown below. I want to run a query on the node such that if two users are friends they can see each others post. But if they are not friends they cannot see each others posts
Users
123840ajldkjfas0d9
username: Joe
friend
78983049802930laks: true
78983049802930laks: true
4563049802930laks
username: Ken
friend
123840ajldkjfas0d9: true
78983049802930laks
username: Pean
friend
123840ajldkjfas0d9: true
posts
876f92fh02hfj02930239
post: This is cool
whoposted: 123840ajldkjfas0d9
39fh938hqw9320923308
post: I love pizza
whoposted: 78983049802930laks
users-posts
123840ajldkjfas0d9
876f92fh02hfj02930239: true
78983049802930laks
39fh938hqw9320923308: true
This is my query currently, it is showing all post for all users whether they are friends or not. Please i need help with this.
DataService.ds.REF_USERS.observe(.value, with: { (userSnapshot) in
if let snapshot = userSnapshot.children.allObjects as?
[FIRDataSnapshot]{
for userSnap in snapshot{
print("snapshot.key: \(userSnap.key)")
let userKey = userSnap.key
if var userDict = userSnap.value as? Dictionary<String,
AnyObject>{
let postUserPicUrl = userDict["profileImgUrl"] as? String
if let firstName = userDict["firstName"] as? String{
("firstName: \(firstName)")
DataService.ds.REF_POST.observeSingleEvent(of: .value, with: {
(postSnapshot) in
if let postSnapshot = postSnapshot.children.allObjects as?
[FIRDataSnapshot]{
for postSnap in postSnapshot{
if var postDict = postSnap.value as? Dictionary<String, AnyObject>{
if let refPostUserKey = postDict["user"] as? String{
if userKey == refPostUserKey{
DataService.ds.REF_BLOCK_USER.observeSingleEvent(of: .value, with: {
(blockUserSnapshot) in
if let blockUserSnapshot = blockUserSnapshot.children.allObjects as?
[FIRDataSnapshot] {
for blockUserSnap in blockUserSnapshot{
if var blockUserDict = blockUserSnap.value as? Dictionary<String,
AnyObject> {
if let user = blockUserDict["user"] as? String{
if firstName != user {
postDict["postUserPicUrl"] = postUserPicUrl as AnyObject?;
let postKey = postSnap.key
let post = Post(postKey: postKey, postData: postDict)
self.posts.append(post)
}
}
}
}
}
self.tableView.reloadData()
})
}
}
}
}
}
self.tableView.reloadData()
})
}
}
}
}
self.tableView.reloadData()
})
}
I mean this with no disrespect, but you are not utilizing these queries well with each nested within another. Also, make sure you update all of your queries. The Post query uses the old formatting while your user query is up to date.
You should create 3 dictionaries to hold the data for each node Users, posts, users-posts as well as a var to hold the current user string and a dictionary to contain the post data:
var users = [String:Any]()
var posts = [String:Any]()
var usersposts = [String:Any]()
var currentUserKey:String!
var visibleposts = [String:Any]()
Then have three separate queries to get the data. Currently it does not appear that you are querying for any specific users so I will do the same:
func getUserData(){
DataService.ds.REF_USERS.observe(.childAdded, with: {snapshot in
let key = snapshot.key
let data = snapshot.value as? [String:Any] ?? [:]
self.users[key] = data
})
}
func getPostsData(){
DataService.ds.REF_POST.observe(.childAdded, with: {snapshot in
let key = snapshot.key
let data = snapshot.value as? [String:Any] ?? [:]
self.posts[key] = data
self.refreshPosts()
})
}
func getUsersPostsData(){
DataService.ds.REF_BLOCK_USERS.observe(.childAdded, with:{snapshot in // I am guessing you have the users posts here?? there doesn't seem to be sample data for blocked users in your OP
let key = snapshot.key
let data = snapshot.value as? [String:Any] ?? [:]
self.usersposts[key] = data
self.refreshPosts()
})
}
Now get the current user before firing off these queries in the view did load and then call each query.
override func viewDidLoad(){
self.currentUserKey = (FIRAuth.auth()?.currentUser?.uid)!
/* you may want to do some error handling here to ensure the user
is actually signed in, for now this will get the key if
they are signed in */
self.getUserData()
self.getPostsData()
self.getUsersPostsData()
// data will be refreshed anytime a child is added
}
func refreshPosts(){
self.validposts = [:]
let validUsers = [String]() // this will hold the valid keys to get posts
validUsers.append(self.currentUserKey)
let currentUserData = users[self.currentUserKey] // filter the current user data to get the friends
// get friends keys
let friendsData = currentUserData["friends"] as? [String:Any] ?? [:]
for key in friendsData.keys {
// add friends posts to the validposts data
validUsers.append(key)
}
// get current users posts:
for (key,value) in self.posts {
let postData = value as? [String:Any] ?? [:]
let whoposted = postData["whoposted"] as? String ?? ""
if validUsers.contains(whoposted){
self.validposts[key] = postData
}
}
// access the self.validposts data in your UI however you have it setup
// The child added queries above will continue to fire off and refresh
// your data when new posts are added.
// I am still not clear what the usersposts data is for so it is omitted here.
}