meteor this.params._id is undefined stick -

i'm student learning meteor.js.

iron:router using:

this.route('postedit', {   path: '/posts/:_id/edit',   data: function() {    console.log(this.params._id);   return posts.findone(this.params._id); } }); 

and error displayed:

this.params._id value undefined76kndyuwd2kdx2eee...

why undefined has stick value?

postedit call has:

<a href="{{pathfor 'postedit'}}">edit</a> 

originally, 76kndyuwd2kdx2eee due url being localhost:3000/posts/undefined76kndyuwd2kdx2eee/edit...

please, me. thank you.

please update iron@1.0.9, should fix it.