title: Django foreign key display values in detail view
body: <p>I have a main DB table Radni_nalozi (Work Orders) to which I am attaching Stavke (items) by a foreign key.
  When I go to see details about a specific Work Order I also want to display all the items that are connected to that Work Order by a foreign key.</p>
  <p>I tried many different approaches and it seems that I just can't figure it out on my own.
  I am attaching the code below. In an HTML template, I can only fetch details about specific work orders but not the items.</p>
  <p><img src="https://i.stack.imgur.com/432WW.png" alt="models.py" /></p>
  <p><img src="https://i.stack.imgur.com/uQ4D3.png" alt="views.py" /></p>
  <p><img src="https://i.stack.imgur.com/M3EnQ.png" alt="template html" /></p>