title: How to use select_related
body: <p>How do I use <code>select_related</code> to get the first and last name of the employee class below.   </p>
  
  <pre><code>class Employee(models.Model):
      """
      Model, which holds general information of an employee.
  
      """
      user = models.OneToOneField(User, related_name='users',
                                  on_delete=models.CASCADE, unique=True)
      photo_logo = models.FileField(null=True, blank=True)
  </code></pre>
  
  <h3>Here is how I have implemented my query</h3>   
  
  <pre><code>emp=Employee.objects.filter(pk=1).select_related('user').values('user_first_name','user_last_name','id')
  </code></pre>
  
  <p>But I get the following logs after running a print statement in  <code>django shell</code></p>
  
  <pre><code>Cannot resolve keyword 'user_first_name' into field. Choices are: address, address_id, attendance, basic,
  </code></pre>