Looping in Firebase

Question

I have been trying to find a way to print/isolate each of the children in a part of the JSON data structure in Firebase. I am using swift and another post mentioned and veri

Answer 1

Just make an array of snapshot with keys and loop through it just like that if you want keys of "vets":

let ref = Database.database().reference().child("vets")

ref.observe(.childAdded) { (snapshot) in
    for key in [snapshot.key] {
        print(key)
    }
}

However, if you want the keys of "vets" children then you can do it like this:

ref.observe(.childAdded) { (snapshot) in
    guard let snapChildren = snapshot.value as? [String: Any] else { return }
    for (key, value) in snapChildren {
        print(key)
    }
}

If you need all key-value pairs of "vets" you may get them like this:

ref.observe(.childAdded) { (snapshot) in
    guard let snapChildren = snapshot.value as? [String: Any] else { return }
    for snap in snapChildren {
        print(snap)
    }
}

Wanna print value for a certain key of vets children? Let's say you want to print a vet name:

ref.observe(.childAdded) { (snapshot) in
    guard let snapChildren = snapshot.value as? [String: Any] else { return }
    for (key, value) in snapChildren {
        if key == "Name" {
            print(value)
        }
    }
}

Note: This code will work assuming your path is Database.database().reference().child("vets") and that each vet entry has some kind of AutoID or UID which is our snapshot.key in the first example.

Answer 2

Try this:

FIRDatabase.database().reference().child("vets").observeEventType(.Value, withBlock: { snapshot in
        if let snapshots = snapshot.children.allObjects as? [FIRDataSnapshot] {
            for child in snapshots {
                print("Child: ", child)
            }
        }

    })