title: MongoDB + NoRM- Concurrency and collections
body: <p>Lets say we have the following document structure:</p>
  
  <pre><code>class BlogPost
  {
     [MongoIdentifier]
     public Guid Id{get;set;}
     public string Body{get;set;}
     ....
  }
  
  class Comment
  {
     [MongoIdentifier]
     public Guid Id{get;set;}
     public string Body {get;set;}
  }
  </code></pre>
  
  <p>If we assume that multiple users may post comments for the same post, what would be the best way to model the relation between these?</p>
  
  <p>if Post have a collection of comments, I might get concurrency problems, won't I ?</p>
  
  <p>And placing a FK like attribute on Comment seems too relational , or?</p>