title: Handling huge numbers of Relations in Parse
body: <p>Im currently using a table ViewedPosts to link my Users and BlogPosts.</p>
  
  <p>As I dont need any of the extra data, and as an experiment on optimisation and bandwidth usage, I'd like to move this to a <a href="https://www.parse.com/docs/ios/guide#relations" rel="nofollow">Relation</a> column.</p>
  
  <p>This relation column could become very large, lets say MILLIONS of relations.</p>
  
  <p>Lets say I want to have a list of Blogs and I want to know if they have been viewed by the User. I'd need my full set of relations as well as my paginated Blogs, but what if the User has viewed millions of blog posts?</p>
  
  <p>I'm pretty sure Parse will not return millions of relations in a User object, they will simply be truncated.</p>
  
  <p>What is the best solution for this?</p>