title: MYSQL Search on Rails
body: <p>Suppose that I do not have a certain id in mysql database. I am using rails, so the following code that I am using to query the database is the following...</p>
  
  <p><code>
  <code>@customer = Customer.find(params[:id])</code>
  </code></p>
  
  <p>How do I raise an exception of the ID does not exist? Please let me know :)</p>
  
  <p>Thank you in advance!</p>