title: How to select a record and update it, with a single queryset in Django?
body: <p>How do I run an <code>update</code> and <code>select</code> statements on the same <code>queryset</code> rather than having to do two queries: 
  - one to select the object
  - and one to update the object</p>
  
  <p>The equivalent in SQL would be something like:</p>
  
  <pre><code>update my_table set field_1 = 'some value' where pk_field = some_value
  </code></pre>