title: Understanding and using Parse many to many relations
body: <p>I have 2 tables in Parse like so:</p>
  
  <pre><code>Users:
  (PFUsers table with all Parse data)
  belongsToGroups (A Parse Relation to Groups which is many to many)
  
  Groups:
  groupId
  name
  groupMembers (A Parse Relation to Users which is also many to many)
  </code></pre>
  
  <p>I have the following code:</p>
  
  <pre><code>PFObject *groups = [PFObject objectWithClassName:@"Groups"];
  groups[@"name"] = name;
  syncUsers[@"isActive"] = [NSNumber numberWithInt:1];
  //[groups saveInBackground];
  
  PFUser *current = [PFUser currentUser];
  PFRelation *relation = [syncUsers relationforKey:@"groupMembers"];
  [relation addObject:current];
  [groups saveEventually];
  
  PFRelation *relation2 = [current relationforKey:@"belongsToGroups"];
  [relation2 addObject:groups];
  [current saveEventually];
  </code></pre>
  
  <p>First, the top 2 blocks of code work fine, but how do I update the relationship in Users so that I can do View Relation in Parse and see my groups?</p>
  
  <p>Two, do I need to create the Relation in users AND groups so that it can be many to many?</p>