Changed overview and tutorial docs to use render_to_response and get_object_or_404, to cut down on code

git-svn-id: http://code.djangoproject.com/svn/django/trunk@678 bcc190cf-cafb-0310-a4f2-bffc1f526a37

docs/tutorial04.txt

@@ -48,27 +48,20 @@ included this line::
 
 So let's create a ``vote()`` function in ``myproject/apps/polls/views/polls.py``::
 
-    from django.core import template_loader
-    from django.core.extensions import DjangoContext as Context
+    from django.core.extensions import get_object_or_404, render_to_response
     from django.models.polls import choices, polls
-    from django.utils.httpwrappers import HttpResponse, HttpResponseRedirect
-    from django.core.exceptions import Http404
+    from django.utils.httpwrappers import HttpResponseRedirect
 
     def vote(request, poll_id):
-        try:
-            p = polls.get_object(pk=poll_id)
-        except polls.PollDoesNotExist:
-            raise Http404
+        p = get_object_or_404(polls, pk=poll_id)
         try:
             selected_choice = p.get_choice(pk=request.POST['choice'])
         except (KeyError, choices.ChoiceDoesNotExist):
             # Redisplay the poll voting form.
-            t = template_loader.get_template('polls/detail')
-            c = Context(request, {
+            return render_to_response('polls/detail', {
                 'poll': p,
                 'error_message': "You didn't select a choice.",
             })
-            return HttpResponse(t.render(c))
         else:
             selected_choice.votes += 1
             selected_choice.save()
@@ -109,15 +102,8 @@ After somebody votes in a poll, the ``vote()`` view redirects to the results
 page for the poll. Let's write that view::
 
     def results(request, poll_id):
-        try:
-            p = polls.get_object(pk=poll_id)
-        except polls.PollDoesNotExist:
-            raise Http404
-        t = template_loader.get_template('polls/results')
-        c = Context(request, {
-            'poll': p,
-        })
-        return HttpResponse(t.render(c))
+        p = get_object_or_404(polls, pk=poll_id)
+        return render_to_response('polls/results', {'poll': p})
 
 This is almost exactly the same as the ``detail()`` view from `Tutorial 3`_.
 The only difference is the template name. We'll fix this redundancy later.