title: How to reload an async with links hasMany relationship?
body: <p>Lets say we have</p>
  
  <pre><code>Post = DS.Model.extend({
    comments: DS.hasMany({async: true})
  })
  
  Comment = DS.Model.extend({
    post: DS.belongsTo()
  })
  </code></pre>
  
  <p>and I have to use the <code>links</code> feature because otherwise I get a 414 error due to too much comments on a post.</p>
  
  <p>Since this commit <a href="https://github.com/emberjs/data/commit/4d717bff53f8c93bedbe74e7965a4f439882e259" rel="nofollow noreferrer">https://github.com/emberjs/data/commit/4d717bff53f8c93bedbe74e7965a4f439882e259</a></p>
  
  <p>It seems like it's impossible to trigger a reload of the post.get('comments'), ie sending a GET request on for example post/42/comments.</p>
  
  <p>Is there any solution for that ?</p>