title: search for key in a nested hash in Rails
body: <p>I have the following nested hash (from Ominauth-Facebook) captured in an object called <code>myAuth</code> </p>
  
  <pre><code>&lt;Ominauth::AuthHash credentials 
                       extra=#&lt;Hashie:: Mash 
                       raw_info=#&lt;Hashie::Mash email="myemail@gmail.com"&gt;&gt;&gt;
  </code></pre>
  
  <p>I would like to extract email, so I use: </p>
  
  <pre><code>myAuth['extra']['raw_info']['email']
  </code></pre>
  
  <p>However, I would like to search the entire hash and get the value for key <code>email</code> without knowing exact hash structure. How should I go about it?</p>
  
  <p>Thank you.</p>