title: filtering random objects in django
body: <p>How can i filter 12 random objects from a model in django .
  I tried to do this but It does not work and It just returned me 1 object.</p>
  <pre><code>max = product.objects.aggregate(id = Max('id'))
  max_p = int(max['id'])
  l = []
  for s in range(1 , 13):
      l.append(random.randint(1 , max_p))
  for i in l:
      great_proposal = product.objects.filter(id=i)
  </code></pre>