title: Lock show action for only one user at the same time
body: <p>I'm looking for the best solution to the following problem.</p>
  
  <p>Employees of online store will use this application.<br> Employees need work with orders but application must lock order for another employee when one of them looking in order (other employee can not open order).</p>
  
  <p>So, I'm looking the way to make this lock.</p>
  
  <p>I have only one idea. In show view I can put jquery script with loop that will be send async request with increase the lockout time. When employee leave order, then lock expire after a few seconds.</p>
  
  <p>Do you have any better ideas? </p>