ArangoDB - How to get relations between 2 collections
<p>I have 2 vertex collections:</p>

<ul>
<li><code>users</code></li>
<li><code>articles</code></li>
</ul>

<p>and 1 edge collection:</p>

<ul>
<li><code>userfollow</code> (relation between user following other users)</li>
</ul>

<p>The problem is when user follow other users and the followed users wrote some articles, how to get the articles based on the user following?</p>