I have 2 records in my users table
This code below
let fcmTokenRef = Database.database().reference().root.child("users").child(id!).child("fcmToken")
fcmTokenRef.observe(DataEventType.value, with: { (snapshot) in
print(">>",snapshot)
})
will print out the token of a child
How do I adjust my code to print all the tokens for all my children?
You can try
let fcmTokenRef = Database.database().reference().root.child("users").observe(DataEventType.value, with: { (snapshot) in
print(">>",snapshot)
let dic = snapshot.value as! [String:[String:Any]]
Array(dic.values).forEach {
let str = $0["fcmToken"] as! String
print(str)
}
})
You’re requesting a onetime read, hence you’re reading the data once. You need to use .childAdded
Try this:
let fcmTokenRef = Database.database().reference().child(“users”)
fcmTokenRef.observe(.childAdded, with: { (snapshot) in
print(">>",snapshot)
guard let data = snapshot as? NSDictionary else {return}
var each_token = data[“fcmToken”] as? String
print(“all tokens: \(each_token!)”)
})
#puf says something very important:
differences between child added and value firebase
The child_added event fires for each matching child under the node that you query. If there are no matching children, it will not fire.
Related
I'm trying to fetch the first key from my firebase database but for some reason nothing is being printed out. How can I get the first key from my firebase database using .childAdded
let userMessagesRef = Database.database().reference().child("user-message").child(uid).child(userId)
userMessagesRef.observe(.childAdded, with: { (snapshot) in
guard let first = snapshot.children.allObjects.first as? DataSnapshot else { return }
print(first)
This in incredibly easy if you literally are asking how to only ever get the first child of a node. Here's how to only get the first child of a /users node
func getFirstChild() {
let usersRef = self.ref.child("users")
usersRef.observeSingleEvent(of: .childAdded, with: { snapshot in
print(snapshot)
})
}
or
print(snapshot.key)
if you just want the key.
Or, if you want to use a query to do the same thing
func getFirstChildAgain() {
let usersRef = self.ref.child("users")
let query = usersRef.queryOrderedByKey().queryLimited(toFirst: 1)
query.observeSingleEvent(of: .value, with: { snapshot in
print(snapshot)
})
}
The child_added event is typically used when retrieving a list of items from the database. Unlike value which returns the entire contents of the location, child_added is triggered once for each existing child and then again every time a new child is added to the specified path. The event callback is passed a snapshot containing the new child's data. For ordering purposes, it is also passed a second argument containing the key of the previous child.
From: Read and Write Data on iOS
Per your requirements, this is possible in .value and childAdded.
var child_array = [String:String]
let userMessagesRef = Database.database().reference().child("user-message").child(uid).child(userId)
userMessagesRef.observe(.childAdded, with: { (snapshot) in
let value = snapshot.value as? String ?? "Empty String"
let key = snapshot.key
child_array[key] = value;
}) { (error) in
print(error.localizedDescription)
}
then:
if let first = child_array.first?.key {
print(first) // First Key
}
Big NOTE: child_added randomly collects this data, you should never use it to sort your data
My current firebase database structure is like this
customer
-L1x2AKUL_KNTKXyza
name:"abc"
subscription
-L1x2AKlvmG0RXv4gL
sub_no: "123"
sub_name: ""
-L1x2AKlvmG0RXv4ab
sub_no: "456"
sub_name" ""
-L1x2AKUL_KNTKXymk
name:"xyz"
subscription
-L1x2AKlvmG0RXv4xy
sub_no: "789"
sub_name: ""
I am trying to access all subcriptions of all customer records at once.
This is the code I am using:
var ref: DatabaseReference!
ref = Database.database().reference(withPath: "customer")
ref.observe(.value, with: { snapshot in
let enumerator = snapshot.children
while let rest = enumerator.nextObject() as? DataSnapshot {
let imageSnap = rest.childSnapshot(forPath: "subscription")
let dict = imageSnap.value as! NSDictionary
//self.vehicleListDict.append(dict.object(forKey: "sub_no") as! NSDictionary)
print("value : \(dict)")
}
print("vehicleListDict : \(self.vehicleListDict)")
}) { (error) in
print(error.localizedDescription)
}
I am unable to access all the subscriptions within all customer records at once. Its only accessing till one level. I tried to put a while loop within the while that exists but that also does not give me the output needed. It goes in an infinite loop instead. Please could anyone help. I am using firebase realtime database for the first time.
The fetched values should be
123
456
789
The code for doing specifically what you are asking is
let customerRef = self.ref.child("customer")
customerRef.observe(.childAdded, with: { snapshot in
let subscriptionSnap = snapshot.childSnapshot(forPath: "subscription")
for child in subscriptionSnap.children {
let snap = child as! DataSnapshot
let dict = snap.value as! [String: Any]
let subNo = dict["sub_no"] as! String
print(subNo)
}
})
and the output is
a123
a456
a789
*note that I am reading the sub_no as a STRING which is why I added 'a' in front. If they are actually integers change the line to
let subNo = dict["sub_no"] as! Integer
*note2 this will leave a .childAdded observer to the main node in question so any further children that are added will fire the code in the closure.
Edit:
If you want to just retrieve all of the data at one time and not leave a childAdded observer then this will do it:
let customerRef = self.ref.child("customer")
customerRef.observeSingleEvent(of: .value, with: { snapshot in
for customerChild in snapshot.children {
let childSnap = customerChild as! DataSnapshot
let subscriptionSnap = childSnap.childSnapshot(forPath: "subscription")
for subscriptionChild in subscriptionSnap.children {
let snap = subscriptionChild as! DataSnapshot
let dict = snap.value as! [String: Any]
let subNo = dict["sub_no"] as! String
print(subNo)
}
}
})
and the output is
a123
a456
a789
I am trying to observe multiple data at once using firebase, the observation block keeps looping until it fetchs all the data. I need to know when it is actually done so I can execute another block. How can I do that?
databaseRef.child("First_Secondary_Grade").child("0").child("0").queryOrderedByKey().observe(.childAdded, with: {
(snapshot) in
if let dictoinary = snapshot.value as? [String: AnyObject] {
let dataofthequsation = structofthedata()
dataofthequsation.setValuesForKeys(dictoinary)
}
})
i think i figured it out
let databaseRef = FIRDatabase.database().reference()
var gotitall = 0
// First you need to observe single event to get the real count of children in swift 3 observe will count the keys inside a child. That's why!
databaseRef.child("First_Secondary_Grade").child("0").child("0").observeSingleEvent(of:.value, with:{ (snap) in
gotitall = Int(snap.childrenCount)
databaseRef.child("First_Secondary_Grade").child("0").child("0").observe(.childAdded, with: {
snapshot in
if let dictoinary = snapshot.value as? [String: AnyObject] {
let dataofthequsation = structofthedata()
dataofthequsation.setValuesForKeys(dictoinary)
self.dataofthequsation.append(dataofthequsation)
// this is will run when the block runs through all children
if gotitall == self.dataofthequsation.count {
completion()
}
}
})
})
func generateDataForRecents() {
if URLArrayStringThisSeason.count == 0 {
self.activityIndicator2.isHidden = false
self.activityIndicator2.startAnimating()
}
let databaseRef = FIRDatabase.database().reference()
databaseRef.child("palettes").queryLimited(toFirst: 100).observe(.value, with: { (snapshot) in
if let snapDict = snapshot.value as? [String:AnyObject]{
for each in snapDict as [String:AnyObject]{
let URL = each.value["URL"] as! String
self.URLArrayStringRecents.append(URL)
//print(self.URLArrayString.count)
//print(snapshot)
//let pictureTitle = each.value["title"] as! String
print(self.URLArrayStringRecents.count)
}
}
self.whatsNewCollectionView?.reloadData() //Reloads data after the number and all the URLs are fetched
self.activityIndicator2.stopAnimating()
self.activityIndicator2.isHidden = true
})
}
The following code does a retrieval of data each time the function is called, or when a new data is added.
This is extremely useful when the app is first started up or closed and then restarted. However, when the app is running, whenever a new entry is added, the code seemed to run again and thus appending twice the amount of new data.
For example, when there are already 15 entries identified and then suddenly a new entry is added, the array of the URL would contain 15+16 thus amounting to a total of 31.
How do I make it such that the new data is added to the array instead of adding the entire snapshot in?
You do that by listening for .childAdded events, instead of listening for .value:
var query = databaseRef.child("palettes").queryLimited(toFirst: 100)
query.observe(.childAdded, with: { (snapshot) in
let URL = snapshot.childSnapshot(forPath/: "URL").value as! String
self.URLArrayStringRecents.append(URL)
}
Since you have a limit-query, adding a 101st item means that one item will be removed from the view. So you'll want to handle .childRemoved too:
query.observe(.childRemoved, with: { (snapshot) in
// TODO: remove the item from snapshot.key from the araay
})
I recommend that you spend some time in the relevant documentation on handling child events before continuing.
Please check below method. I have use this method not getting any duplicate entry.
func getallNotes()
{
let firebaseNotesString: String = Firebase_notes.URL
let firebaseNotes = FIRDatabase.database().referenceFromURL(firebaseNotesString).child(email)
firebaseNotes.observeEventType(.Value, withBlock: { snapshot in
if snapshot.childSnapshotForPath("Category").hasChildren()
{
let child = snapshot.children
self.arrNotes = NSMutableArray()
self.arrDictKeys = NSMutableArray()
for itemsz in child
{
let childz = itemsz as! FIRDataSnapshot
let AcqChildKey : String = childz.key
if AcqChildKey == AcqIdGlobal
{
if (childz.hasChildren() == true)
{
let dictChild = childz.value as! NSMutableDictionary
self.arrDictKeys = NSMutableArray(array: dictChild.allKeys)
for i in 0..<self.arrDictKeys.count
{
let _key = self.arrDictKeys.objectAtIndex(i).description()
print(_key)
let dictData : NSMutableDictionary = NSMutableDictionary(dictionary: (dictChild.valueForKey(_key)?.mutableCopy())! as! [NSObject : AnyObject])
dictData.setObject(_key, forKey: "notesId")
self.arrNotes.addObject(dictData)
}
}
}
}
self.tableviewNote.reloadData()
}
})
}
As for the query for removed child,
query.observe(.childRemoved, with: { (snapshot) in
print(snapshot)
let URL = snapshot.childSnapshot(forPath: "URL").value as! String
self.URLArrayStringThisSeason = self.URLArrayStringThisSeason.filter() {$0 != URL}
self.thisSeasonCollectionView.reloadData()
})
it will obtain the URL of the removed child and then update the array accordingly.
I'm new to firebase and I have such structure of my firebase project
I want to get all objects, that "Interested" value is equal to "men"
I wrote such code, to get all object sorted by interes value:
let thisUserRef = URL_BASE.childByAppendingPath("profile")
thisUserRef.queryOrderedByChild("Interest")
.observeEventType(.Value, withBlock: { snapshot in
if let UserInterest = snapshot.value!["Interest"] as? String {
print (snapshot.key)
}
}
But I receive nil.
you need to loop through all the key-value profiles
if let allProfiles = snapshot.value as? [String:AnyObject] {
for (_,profile) in allProfiles {
print(profile);
let userInterest = profile["Interest"]
}
}
Here _ is the key that is in the format KYXA-random string and profile will be the element for that key.
Edit:
There is querying for child values as per the docs.
Try thisUserRef.queryOrderedByChild("Interest").equalTo("men") and then using the inner loop that i specified in the answer
This is a basic query in Firebase. (Updated for Swift 3, Firebase 4)
let profileRef = self.ref.child("profile")
profileRef.queryOrdered(byChild: "Interest").queryEqual(toValue: "men")
profileRef.observeSingleEvent(of: .value, with: { snapshot in
for child in snapshot.children {
let dict = child as! [String: Any]
let name = dict["Name"] as! String
print(name)
}
})
The legacy documentation from Firebase really outlines how to work with queries: find it here
Legacy Firebase Queries
The new documentation is pretty thin.
Oh, just to point out the variable; thisUserNode should probably be profileRef as that's what you are actually query'ing.