firebase grab by orderByChild then update results key

Question

So i have this query and currently collects all the data with materialName equals to gold. I wanted change all to false.

// materialName = \"gold\"          


        

Answer 1

You need to loop over the results (since there can be multiple matching nodes) and then update each:

database.ref('/app/posts')
  .orderByChild('material')
  .equalTo(materialName)
  .once('value', function (snapshot) {
    snapshot.forEach(function(child) {
      child.ref.update({material: false});
    });
});

You'll also note that I changed your .startAt().endAt() to an equalTo(), which gives the same results with less code.