CODEWITHSUNDEEP
meteormeteor-blaze
derek
derek

Reputation: 10217

this.subscribe and Template.instance().subscribe do not work

I am using Meteor 1.4.

Template.showProducts.onCreated(() => {
  var handle = Meteor.subscribe("products");
  //not working: var handle = this.subscribe("products");
  //not working: var handle = Template.instance().subscribe("products");

  Tracker.autorun(() => {
  //not working: this.autorun

    const isReady = Meteor.ready();
    //not working: this.subscriptionsReady()

    if(isReady){
      const products = Products.find().fetch();
      Session.set("prods", products);
    }
  });
});

If I use "this.subscribe", I got:

Uncaught TypeError: _this.subscribe is not a function

If I use "Template.instance()", I got:

Cannot read property 'subscriptionsReady' of null

Upvotes: 0

Views: 466

Answers (2)

richsilv
richsilv

Reputation: 8013

The problem is that you're passing the onCreated handler an arrow function, which does not allow binding of this (reference). As a result, Meteor is unable to correctly bind the template instance it has just created, and your subscriptions (and various other things) will fail.

The fix is just to pass onCreated a traditional JS function:

Template.showProducts.onCreated(function () {
  ...

Upvotes: 2

user3374348
user3374348

Reputation: 4101

If you use an arrow function, then the value of this which Meteor tries to pass in is lost. Instead use a regular anonymous function (function () { ... }).

You should then use this.autorun rather than Tracker.autorun. This will ensure that the autorun is cleaned up when the template disappears, and will allow Template.instance to work inside the autorun.

Upvotes: 2

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