meteor iron router prepends "undefined" to id -

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hi i'm following discover meteor book, , i'm in chapter 5-3. have router.js , post_item.html precisely book, , every url, /posts/undefined<id>. can't figure out why undefined present in front of every id. below relevant code:

router.configure({    layouttemplate: 'layout',    loadingtemplate: 'loading',    waiton: function() { return meteor.subscribe('posts'); }  });    router.route('/', {name: 'postslist'});    router.route('/posts/:_id', {    name: 'postpage',    data: function() { return posts.findone(this.params._id); }  });
<template name="postitem">    <div class="post">      <div class="post-content">        <h3><a href="{{url}}">{{title}}</a><span>{{domain}}</span></h3>      </div>      <a href="{{pathfor 'postpage'}}" class="discuss btn btn-default">discuss</a>    </div>  </template>

this issue caused in 1.0.8 release can check here. update package 1.0.9 release typing in console meteor update or manually meteor add iron:router@1.0.9 , should work.


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