firebase_compute

Library for doing reactive computations with firebase.

Usage

A simple, yet powerful usage example!

Given a Firebase instance containing events in a calendar, the following code will print the next appointment.

import 'package:firebase_compute/firebase_compute.dart';
import 'package:firebase_dart/firebase_dart.dart';
import 'dart:async';

main() async {
  var ref = new Firebase("https://my-project.firebaseio.com");

  var data = new DynamicReference(ref); // create a reactive version of a firebase reference

  data
      .child("calendar").child("events")    // reference the subtree at /calendar/events
      .orderByChild("startTime").limitToFirst(1) // order by child startTime and limit to first result
      .startAt(new ReactiveDateTime.now().toIso8601String())  // start at the current time
      .firstChild() // move to the first child
      .val()
      .asStream().forEach((v)=>print("your next appointment is at ${v["startTime"]}: ${v["description"]}"));

  ref.child("calendar").child("events").push({
    "startTime": new DateTime.now().add(new Duration(hours: 4)).toIso8601String(),
    "description": "hairdresser"
  });  // will print "your next appointment is at ... : hairdresser"

  await new Future.delayed(new Duration(seconds: 2));

  ref.child("calendar").child("events").push({
    "startTime": new DateTime.now().add(new Duration(seconds: 10)).toIso8601String(),
    "description": "doctor"
  });  // will print "your next appointment is at ... : doctor"

  // after 10 seconds will print "your next appointment is at ... : hairdresser"



}

Features and bugs

Please file feature requests and bugs at the issue tracker.