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 verified this as the solution.

for child in snapshot.childSnapshotForPath("vets").children {
    print(child.key)
}

but this is not valid because it comes with this warning.

Ambiguous use of 'key'

how do you recommend I loop through the data? All help is greatly appreciated.

Meagan S. · Answer 1 · 2016-06-25T00:14:34.123

4

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)
            }
        }

    })

edited Jun 25 '16 at 00:14

answered Jun 24 '16 at 23:52

Meagan S.

974
9
11

How do I print the children of those children? – Ryan Cocuzzo Jun 25 '16 at 00:06
Updated code to full block. Prints all children and values. – Meagan S. Jun 25 '16 at 00:15
@Ryan, did that do what you needed? – Meagan S. Jun 25 '16 at 17:25

ISS · Answer 2 · 2019-05-21T12:11:09.097

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.

Looping in Firebase

2 Answers2

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