title: loop through filtered collection in jekyll
body: <p>I try to do things like this in my post:</p>
  
  <pre class="lang-html prettyprint-override"><code>&lt;ul class="articles-list"&gt;
    {% for post in site.posts | where:'group', post.group %}
      &lt;div data-scroll-reveal="enter ease 0"&gt;
        {% include article-snippet.html %}
      &lt;/div&gt;
    {% endfor %}
  &lt;/ul&gt;
  </code></pre>
  
  <p>but it loops through all my collection instead the only loops posts with special group.</p>