firebase update multiple database realtime

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firebase update multiple database realtime

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I'm doing a sales system with firebase and javascript, I have products and I want to modify several of them at the same time with the following code only modifies me the first one

 for (var i = 0; i < compra.length; i++) {
        if (compra[i].value!=0){
            var key=compra[i].getAttribute("key");
            var cantidadcompra=compra[i].value;
            refproductoeditar=refproductos.child(key);
            refproductoeditar.update({
                cantidad:cantidad-cantidadcompra,
            })
        }
    }

javascript firebase update

asked by Adimer Paul 20.07.2018 в 15:14

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score 0 · Answer 1

At least in the code for firebase there seems to be no problem. The sure problem is how are you getting the values of compra .

Two things may be happening

The compra object has only one property, and by chance it is the first of firebase .

The compra object has only one of its properties that matches the data saved in firebase . If this were true, you would see an error message in the console that shows you are trying to update firebase data that does not exist.

That only one of the properties of compra has value other than 0

I suggest some changes:

for (var i = 0; i < compra.length; i++) {
        if (compra[i].value!=0){
            var key=compra[i].getAttribute("key");
            var cantidadcompra=compra[i].value;
            // Usar variables internas para evitar conflictos
            var refProductoEditar = refproductos.child(key);
            refProductoEditar.update({
                cantidad: cantidad - cantidadcompra,
                        //  ^ de donde sale cantidad?
            })
        }
    }