Class-based generic views в Django

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"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

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Class Based Generic Views Django meetup 3

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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 HKpResponseRedirect('/thanks/') else: return render_to_response('meetup.html', {'form': form}) else: form = MeetupForm(instance = meetup) return render_to_response('meetup.html', {'form': form}) FuncQon Based

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

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

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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 DetailView(SingleObjectTemplateResponseMixin, BaseDetailView): pass class ListView(MulQpleObjectTemplateResponseMixin,BaseListView): pass Реализация

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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' Реализация

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3 основных требования к view в Django: •  Должны быть callable объектом •  Должны принимать НNpRequest •  Должны возвращать HNpResponse

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

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

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

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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)

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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)

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SUCCESS!

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h?p://ccbv.co.uk/

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TemplateView

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as_view() исходный код

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h?ps://github.com/FZambia/django-‐class-‐ based-‐vs-‐funcYon-‐based

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

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Полезные ссылки: • hKps://github.com/django/django/tree/master/django/views/ generic •  hKp://habrahabr.ru/post/136784/ •  hKp://habrahabr.ru/post/137168/ •  hKp://so…waremaniacs.org/blog/2011/10/06/class-‐based-‐ generic-‐views/ •  hKp://kimavr.name/blog/2011/9/2/7/ •  hKps://github.com/brack3t/django-‐braces •  hKps://github.com/lig/django-‐supergeneric •  hKps://code.djangoproject.com/Qcket/6735

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