使用服务器时间戳进行过滤

Question

Firebase provides a mechanism to insert server timestamps .

I was wondering if it also can be used for filtering. Like this:

var db = firebase.database();
var path = '/some/path';
var ref = db.ref(path);
ref.orderByChild('ts')
    .startAt(firebase.database.ServerValue.TIMESTAMP)
    .on('child_added', function(snap) {
        //do something
    });

Error: Query: First argument passed to startAt(), endAt(), or equalTo() cannot be an object.

Answer 1

Assuming you've already set the 'ts' child of a bunch of entries, you would add an actual timestamp to your startAt method like startAt('1473645571228') .

You can create the Unix timestamp client side with Moment.js, or if you need it from Firebase, you can quickly set and retrieve it .