title: django rest framework an always sorting field
body: <p>I want to have a fixed sorting field applied to all custom sortings. To be more specific imagine we have a list of employees, if user choose this form be sorted by hire_date, I want the result be sorted by hire_date and employee_id together. I mean each ordering should be ordered by employee_id inside! For example if we have 5 employees hired today, if hire_date is the sorting field, these 5 be sorted by employee_id and for the other days the same story.</p>
  
  <p>using the following is not the cure. It only sorts them on employee_id when no ordering is set:</p>
  
  <pre><code>queryset = models.Employee.objects.order_by('id')
  </code></pre>
  
  <p>And this one's result is same as previous:</p>
  
  <pre><code>filter_backends = (CustomFilterSetBackend, filters.OrderingFilter)
  custom_filters = (
      ........
  )
  ordering_fields = (............)
  ordering = ('id',)
  </code></pre>
  
  <p>tnx a million</p>