title: Choosing between embeds_many and references_many in Mongoid
body: <p>what are the key points that one should think of while choosing between <code>embeds_many</code> and <code>references_many</code> (or <code>embeds_one</code> and <code>references_one</code>) in Mongoid?</p>
  
  <p>I'm currently preferring <code>embeds_many</code> over <code>references_many</code>, but that is resulting in too many nested <code>embeds_many</code>'ies and I'm worried that it might add unnecessary overhead to the database.</p>