title: ArangoDB edge collection direction
body: <p>Using ArangoDB, how can I set different search directions for the edge collections in an AQL query?  For example in this query, I'd like the 'trusts' edge direction to be restricted to outbound whilst the 'likes' edge direction can be any.  From the documentation it looks like I can only set a global direction but I just want to make sure I didn't miss something.</p>
  
  <pre><code>FOR p IN GRAPH_SHORTEST_PATH('myGraph', 'users/PeterB', 'marks/Moon',
   {edgeCollectionRestriction : ['trusts', 'likes']})
  </code></pre>