In the below code I am trying to append string uids to a dictionary the problem is when I do so it seems like the dict is reset after each iteration. How can I fix this?
func getFollowing() {
self.ref.child("Following").child(uid)
.observeSingleEvent(of: .value, with: { (snapshot) in
if let data = snapshot.value as? [String:[String : Any]] {
for key in data.keys {
var dict = (UIApplication.shared.delegate as! AppDelegate).usersCurrentUserIsFollowing
dict[key] = true
print(dict, " this is gtteh dict now dhfsakflk")
}
}
})
}
I was able to solve my problem by doing the following:
func getFollowing() {
self.ref.child("Following").child(uid)
.observeSingleEvent(of: .value, with: { (snapshot) in
var usersData = ["":true]
if let data = snapshot.value as? [String:[String : Any]] {
for key in data.keys {
usersData[key] = true
}
var dict = (UIApplication.shared.delegate as! AppDelegate).usersCurrentUserIsFollowing
dict = usersData
}
})
}
Related
Please find my code below. How can we append filter data on array from Firebase?
var childrenList = [DatabaseList]()
let ref = Database.database().reference(withPath: "Messages")
let query = ref.queryOrdered(byChild: "VideoID").queryEqual(toValue: "12345").observe(.value, with: { (snapshot) in
for childSnapshot in snapshot.children{
print(childSnapshot)
self.childrenList.append(snapshot)
}
})
DispatchQueue.main.async {
self.tableView.reloadData()
}
let ref = Database.database().reference(withPath: "Messages")
let query = ref.queryOrdered(byChild: "VideoID").queryEqual(toValue: "12345").observe(.value, with: { (snapshot) in
print(snapshot)
for (childSnapshotId, childSnapshotValue) in snapshot {
if let dataListDict = childSnapshotValue as? [String: AnyObject] {
//Init you newModel with the dataListDict here
let newModel = DatabaseList(dict: dataListDict)
print(childSnapshot)
self.childrenList.append(newModel)
}
}
DispatchQueue.main.async {
self.tableView.reloadData()
}
})
class DatabaseList : NSObject {
var messageBody : String?
var name : String?
var videoID : String?
init(dict: [String: AnyObject]) {
messageBody = dict["MessageBody"]
name = dict["Name"]
videoID = dict["videoID"]
}
}
Your query is correct but there are few mistakes in finishing block.
self.childrenList.append(snapshot) snapshot is an instance of DataSnapshot not a DatabaseList so you can not append it like this.
for childSnapshot in snapshot.children {
/// childSnapshot is an instance of DataSnapshot not a dictionary but its value will be
guard let data = (childSnapshot as! DataSnapshot).value else {continue}
let dataDict = data as! Dictionary<String, Any>
/// Initializing the new object of DatabaseList and passing the values from data
let list: DatabaseList = DatabaseList()
list.messageBody = dataDict["MessageBody"] as? String
list.name = dataDict["Name"] as? String
list.videoID = dataDict["VideoID"] as? String
/// This is correct, and now you can append it to your array.
childrenList.append(list)
}
Apart from this you will have to reload the tableView inside the finishing block not below the block because this is an asynchronous request and data will come later.
Also its always better to check the data existence. snapshot.exists().
One more suggestion if you want to fetch the data just once then do not use .observe use .observeSingleEvent instead. .observe will fire the block every time there is any change at this node.
Here is the full code snippet.
let query = ref.queryOrdered(byChild: "VideoID").queryEqual(toValue: "12345").observe(.value, with: { (snapshot) in
if !snapshot.exists() {
// Data doesn't exist
return
}
for childSnapshot in snapshot.children {
guard let data = (childSnapshot as! DataSnapshot).value else {continue}
let dataDict = data as! Dictionary<String, Any>
let list: DatabaseList = DatabaseList()
list.messageBody = dataDict["MessageBody"] as? String
list.name = dataDict["Name"] as? String
list.videoID = dataDict["VideoID"] as? String
childrenList.append(list)
}
/// Reload your tableView here
DispatchQueue.main.async {
self.tableView.reloadData()
}
})
And expecting the class model like below:
class DatabaseList: NSObject {
var messageBody: String?
var name: String?
var videoID: String?
}
I want to use variable_a in another function. Actually, I want to load these data into tableviewcell.
func readFIRData() {
var credentials:[String]
let userID = Auth.auth().currentUser?.uid
ref = Database.database().reference().child("usr").child(userID!)
ref.observeSingleEvent(of: .value, with: { (snapshot) in
// Get user value
let value = snapshot.value as? NSDictionary
let Name = value?["firstName"] as? String ?? ""
let PhoneNo = value?["mobile"] as? String ?? ""
var variable_a = [Name,PhoneNo]
self.tableView.reloadData()
}) { (error) in
}
}
You should have a callback (completion handler) in your readFIRData function, and pass variable_a as a parameter in that callback. Parse it into object which you use in table view, and reload tableView in the callback.
Function should look like this:
func readFIRData(_ completion: ([Name,PhoneNo]) -> ()) {
var credentials:[String]
let userID = Auth.auth().currentUser?.uid
ref = Database.database().reference().child("usr").child(userID!)
ref.observeSingleEvent(of: .value, with: { (snapshot) in
// Get user value
let value = snapshot.value as? NSDictionary
let Name = value?["firstName"] as? String ?? ""
let PhoneNo = value?["mobile"] as? String ?? ""
var variable_a = [Name,PhoneNo]
completion(variable_a)
}) { (error) in
}
}
and then have another function which is going to call readFIRData function:
func requestData() {
readFIRData() { [weak self] data in
guard let `self` = self else { return }
self.data = data
DispatchQueue.main.async {
self.tableView.reloadData()
}
}
}
Mention how you get back to main thread to reload tableView. By self.data I assumed data which you will use in table view to instantiate cells.
Solved this way
func GetData(completion: #escaping(_ credentials: [String]) -> Void) {
let userID = Auth.auth().currentUser?.uid
ref = Database.database().reference().child("usr").child(userID!)
ref.observeSingleEvent(of: .value, with: { (snapshot) in
let value = snapshot.value as? NSDictionary
let Name = value?["firstName"] as? String ?? ""
let PhoneNo = value?["mobile"] as? String ?? ""
var variable_a = [Name,PhoneNo]
completion(variable_a)
self.tableView.reloadData()
}) { (error) in
}
}
Now, assign StringArray to some variable. Use below code to assign. Likewise variable StringArrayVariable can be used to populate tableview cells.
GetData { (StringArray) in
self.StringArrayVariable= StringArray
}
I'm trying to get a specific value from Firebase Database. I looked some of the documents such as Google's, but I couldn't do it. Here is the JSON file of the database:
{
"Kullanıcı" : {
"ahmetozrahat25" : {
"E-Mail" : "ahmetozrahat25#gmail.com",
"Yetki" : "user"
},
"banuozrht" : {
"E-Mail" : "banuozrahat#gmail.com",
"Yetki" : "user"
}
}
}
Swift Code:
ref?.child("Kullanıcı").child(userName.text!).observeSingleEvent(of: .value, with: { (snapshot) in
if let item = snapshot.value as? String{
self.changedName = item
}
})
I want to get E-Mail value of a user, not everybody's. How can I do that?
At last I found a solution. If I declare a var and try to use later it returns nil, but if I try use snapshot.value as? String it's ok. Here is a example I did.
ref: FIRDatabaseReference?
handle: FIRDatabaseHandle?
let user = FIRAuth.auth()?.currentUser
ref = FIRDatabase.database().reference()
handle = ref?.child("Kullanıcı").child((user?.uid)!).child("Yetki").observe(.value, with: { (snapshot) in
if let value = snapshot.value as? String{
if snapshot.value as? String == "admin"{
self.items.append("Soru Gönder")
self.self.tblView.reloadData()
}
}
})
In your code, the snapshot will contain a dictionary of child values. To access them, cast the snapshot.value as a Dictionary and then accessing the individual children is a snap (shot, lol)
ref?.child("Kullanıcı").child(userName.text!)
.observeSingleEvent(of: .value, with: { (snapshot) in
let userDict = snapshot.value as! [String: Any]
let email = userDict["E-Mail"] as! String
let yetki = userDict["Yetki"] as! String
print("email: \(email) yetki: \(yetki)")
})
Add the "E-Mail" child to the query.
ref?.child("Kullanıcı").child(userName.text!).child("E-Mail").observeSingleEvent(of: .value, with: { (snapshot) in
if let item = snapshot.value as? String{
self.changedName = item
}
})
I'm working through a course on Udemy to build a chat app with Firebase, Backendless, and Swift. All of the issues (it was written for Swift 2 not 3) I've been able to resolve myself, but this one has me stumped. This function is supposed to retrieve data from the Firebase database, and apparently it was supposed to retrieve it as an NSArray, but it now retrieves it as an NSDictionary, which is making a huge list of errors in the other functions because it's not expecting a dictionary.
func loadRecents() {
firebase.childByAppendingPath("Recent").queryOrderedByChild("userId").queryEqualToValue(currentUser.objectId).observeEventType(.Value, withBlock: {
snapshot in
self.recents.removeAll()
if snapshot.exists() {
let sorted = (snapshot.value.allValues as NSArray).sortedArrayUsingDescriptors([NSSortDescriptior(key: "date", ascending: false)])
}
})
}
I've updated to Swift 3 as far as:
func loadRecents() {
ref = FIRDatabase.database().reference()
let userId = currentUser?.getProperty("username") as! String
ref.child("Recent").queryOrdered(byChild: "userId").queryEqual(toValue: userId).observe(.value, with: {
snapshot in
self.recents.removeAll()
if snapshot.exists() {
let values = snapshot.value as! NSDictionary
}
})
}
Of course, using as! NSArray does not work. Would very much appreciate it if anyone can suggest a method to update this to use Swift 3, sort it by a value in the data, and be able to access it later on. Thanks!
func loadRecents() {
ref = FIRDatabase.database().reference()
let userId = currentUser?.getProperty("username") as! String
ref.child("Recent").queryOrdered(byChild: "userId").queryEqual(toValue: userId).observe(.value, with: {
snapshot in
self.recents.removeAll()
if snapshot.exists() {
let values = snapshot.value as! [String:AnyObject]
}
})}
or you can use also let values = snapshot.value as! [Any]
Hope this will help you, try this code:
func loadRecents() {
let ref = FIRDatabase.database().reference()
let userId = currentUser?.getProperty("username") as! String
ref.child("Recent").queryOrdered(byChild: "userId").queryEqual(toValue: userId).observe(.value, with: {
snapshot in
self.recents.removeAll()
guard let mySnapshot = snapshot.children.allObjects as? [FIRDataSnapshot] else { return }
for snap in mySnapshot {
if let userDictionary = snap.value as? [String: Any] {
print("This is userKey \(snap.key)")
print("This is userDictionary \(userDictionary)")
}
}
})
}
I am currently building an app in Firebase and I want to get all the users pineapple rate.
This is the tree:
user1: uid1 {
fruits: {
apple: 3
pineapple: 5
}
}
user2: uid2 {
fruits: {
apple: 4
pineapple: 2
}
}
I tried this code:
var ref = FIRDatabase.database().reference()
ref.queryOrderedByChild("fruits")
.observeSingleEventOfType(.Value, withBlock: { (snapshot) in
if ( snapshot.value is NSNull ) {
print("not found")
} else {
for child in snapshot.children {
let rate = child.value["pineapple"] as! String
print(rate)
}
}
})
But it gives me an error of unwrapping Nil.
Picture of the structre:
This is supposed to be like this
var ref = FIRDatabase.database().reference()
ref.queryOrderedByChild("user2")
.observeSingleEventOfType(.Value, withBlock: { (snapshot) in
if snapshot.exists() {
for child in (snapshot.value?.allValues)! {
if let fruits = child["Fruits"] as? [String:String]{
let rate = fruits["pineapple"]
print(rate)
}
}
}
})
It seems this just needs a deep query?
let ref = self.myRootRef.child("parent_node")
ref.queryOrderedByChild("Fruits/pineapple").observeSingleEventOfType(.Value, withBlock: {
snapshot in
if ( snapshot.value is NSNull ) {
print("not found")
} else {
for child in snapshot.children {
let key = child.key as String
let dict = child.value["Fruits"] as! NSDictionary
let pineapple_count = dict["pineapple"] as! Int
print("key = \(key) count = \(pineapple_count)")
}
}
})
and the output is
key = uid_1 count = 1
key = uid_0 count = 3
key = uid_2 count = 21
Try out this code below (Xcode 8.3.3, Swift 3 and Firebase 3 )
var ref = Database.database().reference().child("fruits")
ref.observeSingleEvent(of: .value, with: {
(snapshot) in
if let fruitPost = snapshot.value as? Dictionary<String,AnyObject> {
for(key, value) in fruitPost {
if let fruitData = value as? Dictionary<String,AnyObject> {
if let fruits = fruitData["pineapple"] as? String{
let rate = fruits
print(rate)
}
}
}
}
Goodluck mate!