title: Finding records based on different fields/columns?
body: <p>I have a database that has stored information of some users.
  I know for example: <code>User.find(1)</code> will return the user with id:1</p>
  
  <p>What should I call to find a user by email? I searched a lot but could not find anything. </p>
  
  <p>I also tried <code>User.find(:email =&gt; "xyz@abc.com")</code> but it doesn't work.</p>