javascript - Meteor: IronRouter does not trigger notFound rule -

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i meteor app use ironrouter client-side routing.

my routing code looks follows: 

router.map(function() {      this.route('story', {         path: '/story/:_id',         data: function() {             return stories.findone({displayid: +this.params._id});          },         notfound: 'storynotfound'     }); });

i have 2 templates corresponding route: 

<template name="story">     welcome story: {{this.displayid}}. </template>  <template name="storynotfound">     story not found </template>

problem: 'storynotfound' template never rendered, not when 

stories.findone({displayid: +this.params._id})

returns undefined.

instead, 'story' template rendered text "welcome story: ".

what missing?

have tried replacing notfound: notfoundtemplate ? iron router example uses notfound find notfoundtemplate in source code , worked me.

router.map(function() {      this.route('story', {         path: '/story/:_id',         data: function() {             return stories.findone({displayid: +this.params._id});          },         notfoundtemplate: 'storynotfound'     }); });

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