title: MongoDB standards for User/Room relations
body: <p>So I have this MEAN-project I hobby on in my spare time.
  Right now I'm setting up users and rooms, and am a bit hesitant about progressing further, as I am unsure about the proper protocol of db's in general.</p>
  
  <p>As I recall, you're not supposed to have a Many-To-Many relationship; rather, you're supposed to have a relation table.</p>
  
  <p>Right now, my User schema has an array of rooms he is in, and my Room schema has an array of users tied to it (the third and last schema being Message).</p>
  
  <p>Is it better to have a userroomrelation doc that holds a PK, an id of one room, and then a list of all users in this room?</p>
  
  <p>Thanks,
  Rasmus</p>