title: Combining querysets obtained from a loop
body: <p>Let's say I have a list of people that can be "followed".</p>
  
  <p>I'd like to iterate through all the people that a certain user is following and grab posts from all of those users in the form of a queryset.</p>
  
  <p>I understand that I can combine querysets by using chain or |, but I'm a bit confused when it comes to combining querysets that I might grab from looping through everyone being followed.</p>
  
  <pre><code>    following = UserFollows.objects.filter(user_id = user.id)
      for follow in following.iterator():
          UserPost.objects.filter(user=follow.user) #what do I do with this?
  </code></pre>
  
  <p>How would I combine those if I cant explicitly name them to chain or '|'?</p>