title: Multi level MongoDB object querying by key
body: <p>If you only know the key name (say "nickname"), but not the exact path to that key in the object.</p>
  
  <p>e.g. nickname may be at the first level like:</p>
  
  <pre><code>{"nickname":"Howie"}
  </code></pre>
  
  <p>or at the second level:</p>
  
  <pre><code>{"user":{"nickname":"Howie"}}
  </code></pre>
  
  <p>Is it possible to query for nickname equal "<code>Howie</code>" that would return both documents?</p>