Migrating to Meteor 2.10 - Meteor

Most of the new features in Meteor 2.10 are either applied directly behind the scenes (in a backwards compatible manner) or are opt-in. For a complete breakdown of the changes, please refer to the changelog.

The above being said, there are a few items that you should implement to have easier time in the future.

<h3 id="async-tracker">Async Tracker</h3>

Wrapping your async calls in a Tracker.withComputation method will make sure that even async calls are reactive.

before if you used a code like the one below it would only run once and would not be reactive

javascript

Tracker.autorun(async function example1() {
  let asyncData = await asyncDataFunction();
  let users = Meteor.users.find({}).fetch();
});

To be reactive before 2.10 you would need to call the reactive data sources before the async call

javascript

Tracker.autorun(async function example2() {
  let users = Meteor.users.find({}).fetch();
  let asyncData = await asyncDataFunction();
});

Now you can have both examples reactive by wrapping the async call in a Tracker.withComputation method

javascript


Tracker.autorun(async function example1(computation) {
  let asyncData = await Tracker.withComputation(computation, () => asyncDataFunction());
  let users = Meteor.users.find({}).fetch();
});

Tracker.autorun(async function example2(computation) {
  let users = await Tracker.withComputation(computation, () => Meteor.users.find({}).fetch());
  let asyncData = await Tracker.withComputation(computation, () => asyncDataFunction());
  
});

// using async mongo api
Tracker.autorun(async function example2(computation) {
  let asyncData = await Tracker.withComputation(computation, () => asyncDataFunction());
  let users = await Tracker.withComputation(computation, () => Meteor.users.find({}).fetchAsync());
});

<h2 id="older-versions">Migrating from a version older than 2.9?</h2>

If you're migrating from a version of Meteor older than Meteor 2.9, there may be important considerations not listed in this guide. Please review the older migration guides for details: