Issue With Subscriptions On Multiple Instances Of A Template

Here is the scenario. I have a template that contains a #each loop and renders an instance of a particular template, setting the data context on each template as per the docs. <

Solution 1:

The problem is with this.data._id in your subscription, which right now is scoped to the innermost function. You want instance.data._id (which is nonreactive so you wouldn't need an autorun) or Template.currentData() (which is reactive).

Template.runway_panel.onCreated(function(){
    var instance = this;
    instance.autorun(function(){
        var data = Template.currentData();
        var subscription = instance.subscribe('runway_status', data._id);
    });
});

Also note that in your publication, you should mark it as this.ready() if this.userId is undefined. But that's not the source of the error.

Solution 2:

First, userId is a function and userId() would return current user id. And you could check here to learn more detail of instance.subscribe.

I think your problem may happen in getting runway._id in Meteor.publish

Template.runway_panel.onCreated(function(){
  var instance = this;
  // instance subscribe data whose _id is runwayPanelId
  instance.autorun(function(){
    var dataContext = Template.currentData();
    var subscription = instance.subscribe('runway_status', dataContext.runwayPanelId);
  });

  instance.status = function(){
    return Runway_Status.find();
  }
});

// publication
Meteor.publish('runway_status', function(runway){ 
  // using Meteor.userId() to get current user id
  if(Meteor.userId()){
      //Retrieve the last know status for the given runway
      return Runway_Status.find({runway: runway});  
    }
});

---

<template name = 'live'>
  <div class = 'row'>
    {{#each runways}}
      <div class = 'col-md-2'>
        {{> runway_panel runwayPanelId=_id}}
      </div>
    {{/each}}
  </div>

</template>