Give multiple arguments to your linkTo function in Ember.js

child.handlebars

<ul>
{{#each object in controller}}
  <li>{{#linkToContext 'child' object.relatedGrandParent object.relatedParent object }} link {{/linkToContext}}</li>
{{/each}}
</ul>

helpers.js

var linkTo = Ember.Handlebars.helpers.linkTo;
Ember.Handlebars.registerHelper('linkToContext', function() {
  linkTo.apply(this, arguments);
});

rendered.html

<ul>
	<li><a href="/grandparent/23/parent/35/child/32/index">link</a></li>
	<li><a href="/grandparent/565/parent/567/child/554/index">link</a></li>
	<li><a href="/grandparent/523/parent/123/child/99/index">link</a></li>
</ul>

router.js

App.Router.map(function() {

  this.resource('grandParent', { 'path' : '/grandparent/:grand_parent_id' }, function() {
    this.resource('parent', { 'path' : '/parent/:parent_id' }, function() {
      this.resource('child', { 'path' : '/child/:child_id' });
    }
  }

});