title: Parse relational query on multiple geopoint
body: <p>I'm using <strong>Parse.com</strong> as a backend to my app project. I have two classes <code>Deal</code> and <code>Outlets</code>. They are linked to each other via an array. <code>Deal</code> and <code>Outlets</code> have a one to many relationship as every deal can have multiple outlets. Hence,the geopoint information is kept in each outlet record.</p>
  
  <p>I want to query the deal that is nearest to me within 5km. Is there a way for me to include/join the geopoint before calling the query? So far, the "includeKey" functions only does makes the result include the "outlets". But I need to include/join it <strong>before</strong> calling the geo query. </p>
  
  <p>Can anyone help me with this? Thanks so much.</p>