1. "Джанго сделал для гитары больше, чем
кто-либо в джазе. Его стиль игры был не
похож ни на один другой, благодаря ему
джаз стал другим. Будет еще много
выдающихся гитаристов, но никогда не
будет другого Рейнхарда. Я просто
уверен в этом".
Стефан Грапелли, 1954

2. Class Based Generic Views
Django meetup 3

3. Function Based
def meetup_edit(request, pk):
meetup = get_object_or_404(Meetup, pk = pk)
if request.method == 'POST':
form = MeetupForm(request.POST, request.FILES)
if form.is_valid():
form.save()
return HttpResponseRedirect('/thanks/')
else:
return render_to_response('meetup.html', {'form': form})
else:
form = MeetupForm(instance = meetup)
return render_to_response('meetup.html', {'form': form})

4. Class Based
class MeetupUpdateView(UpdateView):
model = Meetup
template_name = ‘meetup.html’
form_class = MeetupForm
success_url = ‘/thanks/’

5. Class Based Views:
• TemplateView
• ListView
• DetailView
• CreateView
• UpdateView
• DeleteView
• RedirectView
• YearArchiveView, MonthArchiveView,
WeekArchiveView, DayArchiveView,
TodayArchiveView

6. Реализация
class TemplateView(TemplateResponseMixin, ContextMixin, View):
def get(self, request, *args, **kwargs):
context = self.get_context_data(params = kwargs)
return self.render_to_response(context)
class ListView(MultipleObjectTemplateResponseMixin,BaseListView):
pass
class DetailView(SingleObjectTemplateResponseMixin, BaseDetailView):
pass

7. Реализация
class CreateView(SingleObjectTemplateResponseMixin, BaseCreateView):
template_name_suffix = '_form'
class UpdateView(SingleObjectTemplateResponseMixin, BaseUpdateView):
template_name_suffix = '_form'
class DeleteView(SingleObjectTemplateResponseMixin, BaseDeleteView):
template_name_suffix = '_confirm_delete'

8. 3 основных требования к view в Django:
• Должны быть callable объектом
• Должны принимать НttpRequest
• Должны возвращать HttpResponse

9. # urls.py
from django.conf.urls import patterns, url
from some_app.views import AboutView
urlpatterns = patterns('',
url(r'^/', AboutView.as_view(), name=”some_app_about”),
)

10. @classonlymethod
def as_view(cls, **initkwargs):
def view(request, *args, **kwargs):
self = cls(**initkwargs)
return self.dispatch(request, *args, **kwargs)
return view

11. @method_decorator(login_required)
def dispatch(self, request, *args, **kwargs):
handler = getattr(self, request.method.lower())
self.request = request
self.args = args
self.kwargs = kwargs
return handler(request, *args, **kwargs)

12. def get(self, request, *args, **kwargs):
context = self.get_context_data(params=kwargs)
return self.render_to_response(context)
def post(self, request, *args, **kwargs):
form_class = self.get_form_class()
form = self.get_form(form_class)
if form.is_valid():
return self.form_valid(form)
else:
return self.form_invalid(form)

13. def get_context_data(self, **kwargs):
return kwargs
def render_to_response(self, context, **kw):
return self.response_class(
request = self.request,
template = self.get_template_names(),
context = context,
**kw)

14. SUCCESS!

15. http://ccbv.co.uk/

16. TemplateView

17. as_view() исходный код

18. https://github.com/FZambia/django-class-
based-vs-function-based

19. 1000 GET запросов, 1000 POST запросов:
Class Based View GET:
11.6180129051
.
Class Based View POST:
15.6457400322
.
Function Based View GET:
11.2678151131
.
Function Based View POST:
15.1721260548
.
----------------------------------------------------------------------
Ran 4 tests in 56.563s

20. Полезные ссылки:
•https://github.com/django/django/tree/master/django/views/g
eneric
• http://habrahabr.ru/post/136784/
• http://habrahabr.ru/post/137168/
• http://softwaremaniacs.org/blog/2011/10/06/class-based-
generic-views/
• http://kimavr.name/blog/2011/9/2/7/
• https://github.com/brack3t/django-braces
• https://github.com/lig/django-supergeneric
• https://code.djangoproject.com/ticket/6735