Firebase Swift: queryEqualToValue by childKey is not working

Question

Has anyone have any luck using the function:

.queryEqualToValue(value: AnyObject?, childKey: String?)

Two things:

1) The childKey

Answer 1

The following is written in the Firebase documentation:

queryEqualToValue Return items equal to the specified key, value, or priority, depending on the order-by method chosen.

Retrieve Data on iOS

The important part is: "depending on the order-by method chosen."

So make sure, you combine the queryEqualToValue-Method with a orderBy-Method.

For example:

    let groupState = "open"

    ref.child("groups").queryOrdered(byChild:"state").queryEqual(toValue:groupState).observe(enventType: .value, with: { snapshot in
        // Returns all groups with state "open"
        for group in snapshot.children {
            print(group)
        }
    })

PS: The variant with childKey is not mentioned in the new Firebase iOS-Guides.