title: Extracting values from params hash: smart way
body: <p>I have the following code in my controller:</p>
  
  <pre><code>login = params[:user_registration][:login]
  password = params[:user_registration][:password]
  email = params[:user_registration][:email]
  </code></pre>
  
  <p>It's too verbose and ugly, any smarter way to extract the keys I need?</p>