title: Redis delete item in sorted set
body: <p>I am using Redis to implement a 'feed' system in my social networking app similar to Instagram/facebook.</p>
  
  <p>I have a key <code>"user:id:feed"</code> which contains a sorted set of ids that point to pictures. What I am wondering is, when a particular photo is deleted, how can I make sure that photo id is also deleted in all feeds that contain that photo id?</p>
  
  <p>Would I have to loop through each and every feed set and delete it? Is that a common pattern in redis?</p>
  
  <p>Thanks</p>