Get Children of Children in Firebase Using Swift

Get Children of Children in Firebase Using Swift

You can try

@IBAction func editAddressButtonPressed(_ sender: Any) {
    self.ref?.child("Users").queryOrdered(byChild: "username").queryEqual(toValue: username.text!).observe(.value, with: { (snapShot) in
    if !snapShot.exists() {
         print("nothing found")
    } else {
        print("found it!")
            print(snapShot)
            let snapShotValue = snapShot.value as! [String:[String:Any]]
            Array(snapShotValue.values).forEach {
               let fName = $0["FirstName"] as! String 
               print(fName)
            }

        }
    })
}

Get the data from all children in firebase using swift

You'll want to attach the observer one level higher in the JSON, and then loop over the child nodes:

ref.observeSingleEvent(of: .value) { snapshot in
    for case let child as FIRDataSnapshot in snapshot.children {
        guard let dict = child.value as? [String:Any] else {
            print("Error")
            return
        }
        let latitude = dict["Latitude"] as Any
        let longtitude = dict["Longtitude"] as Any
        print(longtitude)
        print(latitude)
    }
}

Loop syntax taken from Iterate over snapshot children in Firebase, but also see How do I loop all Firebase children at once in the same loop? and Looping in Firebase

Swift Firebase get values in children

Your ref variable points to the posts node:

let postsRef = ref.child("posts")

Then you retrieve the value of that node, and loop over its children:

postsRef.observeSingleEvent(of: .value) { (snapshot) in
    if snapshot.exists() {
        for child in snapshot.children {

That means that child is a snapshot of xPCdfc5d...Oms2. You then get a dictionary of the properties of this child snapshot and print the imageURL property in there:

            let snap = child as! DataSnapshot
            let dict = snap.value as! [String: Any]
            let myPostURL = dict["imageURL"] as! String
            print("POST URL: " + myPostURL)

But if you follow along closely in your JSON, the xPCdfc5d...Oms2 node doesn't have a property imageURL.

You have two dynamic levels under posts, so you need two nested loops over the value:

postsRef.observeSingleEvent(of: .value) { (snapshot) in
    if snapshot.exists() {
        for userSnapshot in snapshot.children {              
            let userSnap = userSnapshot as! DataSnapshot
            for childSnapshot in userSnap.children {              
                let childSnap = childSnapshot as! DataSnapshot

                let dict = childSnap.value as! [String: Any]
                let myPostURL = dict["imageURL"] as! String
                print("POST URL: " + myPostURL)
            }
        }
    }
}

Swift Firebase read children of a child

Try the following and let me know if it works now:

// SEARCHES FOR SHARING CODE IN DATABASE (ONLINE)
let parentRef = Database.database().reference().child("Recipes")

parentRef.observeSingleEvent(of: .value, with: { snapshot in

    // SHOWING WHATEVER WAS RECEIVED FROM THE SERVER JUST AS A CONFIRMATION. FEEL FREE TO DELETE THIS LINE.
    print(snapshot)

    // PROCESSES VALUES RECEIVED FROM SERVER
    if ( snapshot.value is NSNull ) {

       // DATA WAS NOT FOUND
       print("– – – Data was not found – – –")

    } else {

        // DATA WAS FOUND
        for user_child in (snapshot.children) {

            let user_snap = user_child as! DataSnapshot
            let dict = user_snap.value as! [String: String?]

            // DEFINE VARIABLES FOR LABELS
            let recipeName = dict["Name"] as? String
            let recipeDescription = dict["Description"] as? String
            print("– – – Data for the recipe \(recipeName) with the description \(recipeDescription) was found successfully! – – –")
        }
    }
}

If you only want to retrieve the name and description for one specific recipe, you should change the third line to

parentRef.queryEqual(toValue:DefineWhatToSearchForHere).observeSingleEvent(of: .value, with: { snapshot in

If you constantly want to update to reflect changes, you can either call this function every x seconds using a timer and adding it to override func viewDidLoad() such as

time = Timer.scheduledTimer(timeInterval: 10, target: self, selector: #selector(ViewController.updateFBData), userInfo: nil, repeats: true)

after creating a function called func updateFBData() in which you do whatever you want to do to get new data (see above) and calling it in a defined timeInterval

or you can do what Attila Hegedüs in this excellent tutorial.

Get children of child nodes from firebase (swift 3)

try this:-

   func loadImages (){
    Database.database().reference(withPath: 
   "Студии").child("Дубаи").observe(.value, with: { (snapShot) in
        if snapShot.exists() {
            let array:NSArray = snapShot.children.allObjects as NSArray

            for child in array {
                let snap = child as! DataSnapshot
                if snap.value is NSDictionary {
                    let data:NSDictionary = snap.value as! NSDictionary
                    if let dict = data.value(forKey: "Images") {
                        let dictImage:NSDictionary = dict as! 
        NSDictionary
                        if let image  = dictImage["image1"] {
                            print(image)
                        }
                    }
                }

               // newImage1.append(url2)

            }
        }
    })
}

Iterate over children within a snapshot and get values within each child in Firebase

I assume you are reading the parent node with observeSingleEvent(of: .value so this function reads the data, maintains order, unwraps each child node safely and prints the time. I cast the value to an String but you could use double or something else. I suggest using a double to store your timestamps.

func readTimes() {
    let ref = self.ref.child("00001")
    ref.observeSingleEvent(of: .value, with: { snapshot in
        let allChildren = snapshot.children.allObjects as! [DataSnapshot]
        for snap in allChildren {
            if let time = snap.childSnapshot(forPath: "timeDetected").value as? String {
                print("timeDetected = \(time)")
            }
        }
    })
}

and the output

timeDetected = 2018-05-28T16:00:13Z
timeDetected = 2018-05-28T16:00:18Z
timeDetected = 2018-05-28T16:00:43Z

Firebase - retrieve all child keys and child values into separate arrays in Swift

Snapshots have two properties.

snapshot.key
snapshot.value

When using an observer with .value. all of the key: value children are returned in the snapshot. They can be iterated over to capture each key: value pair like this.

ref.observeSingleEvent(of: .value, with: { (snapshot) in
    for child in snapshot.children {
        let snap = child as! DataSnapshot
        let key = snap.key
        let value = snap.value
        print("key = \(key)  value = \(value!)")
    }
})

Keep in mind that the value property could be a string, number, array or another dictionary (snapshot). In the original question it's a String.

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