title: 'list' object has no attribute 'filter'
body: <pre><code>def g_view(request):
      header_category = Category.objects.all()
      m = Type1.objects.all()
      r=Type2.objects.all()
      g=Type3.objects.all()
      from itertools import chain
      orders=list(sorted(chain(m,r,g),key=lambda objects:objects.start))
  
      mquery = request.GET.get('m')
      if mquery:
          orders = orders.filter(
              Q(name__icontains=mquery) |
              Q(game__name__icontains=mquery) |
              Q(teams__name__icontains=mquery)).distinct()
  </code></pre>
  
  <p>(Type is abstract and type1 type2 type3 are inherited classes)</p>
  
  <p>I got this error 'list' object has no attribute 'filter'</p>