title: Django ORM and hitting DB
body: <p>When I do something like</p>
  
  <p>I. <code>objects = Model.objects.all()</code></p>
  
  <p>and then</p>
  
  <p>II. <code>objects.filter(field_1=some_condition)</code></p>
  
  <p>I hit db every time when on the step 2 with various conditions. Is there any way to get all data in first action and then just take care of the result?</p>