title: django objects.get() does not find result
body: <p>quick question. I run the following code with a <code>try except</code> statement (as it is possible that there is no entry in the database). And for some entries I run into the except block although there is an entry in the database for sure! When using <code>objects.filter()</code> instead of <code>objects.get()</code> I do not have this problem - it never goes to the except block for the same entries in the database!</p>
  
  <pre><code>key = "anystringasprimarykey"
  username = "anyusername"
  try:
      entry = MyDatabase.objects.get(ort=key, user=username)
  except:
      print("oh, exception!")
  </code></pre>
  
  <p>Can anybody give me a tip on what I am doing wrong?</p>