Django Class Base View

Template View

doc: base.py

View: Intentionally simple parent class for all views. Only implements dispatch-by-method and simple sanity checking.
TemplateView: Render a template. Pass keyword arguments from the URL conf to the context
TemplateResponseMixin: A mixin that can be used to render a template
ContextMixin: A default context mixin that passes the keyword arguments received by get_context_data() as the template context

# views.py

from django.views.generic import View

from django.views.generic.base import TemplateView, TemplateResponseMixin, ContextMixin

class TempView(TemplateView):

template_name = 'template.html'

def get_context_data(self, **kwargs):

context = super(TempView, self).get_context_data(**kwargs)

context['title'] = 'THIS IS A TEMPLATE VIEW.'

return context

class AnotherTempView(ContextMixin, TemplateResponseMixin, View):

def get(self, *args, **kwargs):

context = self.get_context_data(**kwargs)

context['title'] = 'THIS IS ANOTHER TEMPLATE VIEW.'

return self.render_to_response(context)

# urls.py

from .views import TempView, AnotherTempView

urlpatterns = [

url(r'^temp1/$', TempView.as_view(), name='temp1'),

url(r'^temp2/$', AnotherTempView.as_view(template_name='template.html'), name='temp2')

]

Custom Mixin

# Solution A

class AnotherTempView(ContextMixin, TemplateResponseMixin, View):

template_name = 'cbv/template.html'

def get(self, *args, **kwargs):

context = self.get_context_data(**kwargs)

context['title'] = 'THIS IS ANOTHER TEMPLATE VIEW.'

return self.render_to_response(context)

def post(self):

pass

"""當服務端使用cbv模式的時候,使用者發給服務端的請求包含url和method,這兩個資訊都是字串型別,服務端通過

路由對映表匹配成功後會自動去找dispatch方法,然後Django會通過dispatch反射的方式找到類中對應的方法並執行

類中的方法執行完畢之後,會把客戶端想要的資料返回給dispatch方法,由dispatch方法把資料返回經客戶端

"""

@method_decorator(login_required)

def dispatch(self, request, *args, **kwargs):

return super(AnotherTempView, self).dispatch(request, *args, **kwargs)

# Solution B

class LoginRequiredMixin(object):

@classmethod

def as_view(cls, **kwargs):

view = super(LoginRequiredMixin, cls).as_view(**kwargs)

return login_required(view)

class AnotherTempView(LoginRequiredMixin, ContextMixin, TemplateResponseMixin, View):

template_name = 'cbv/template.html'

def get(self, *args, **kwargs):

context = self.get_context_data(**kwargs)

context['title'] = 'THIS IS ANOTHER TEMPLATE VIEW.'

return self.render_to_response(context)

def post(self):

pass

Generic display views: Detail View

from django.views.generic.detail import DetailView

from .models import Book

class BookDetail(DetailView):

template_name = 'template.html'

model = Book

Reverse

# urls.py

urlpatterns = [

url(r'^cbv/', include('cbv.urls', namespace='cbv'))

]

# cbv/views.py

from django.core.urlresolvers import reverse

class Book(models.Model):

def get_absolute_url(self):

return reverse('cbv:book_detail', kwargs={'id': self.id})

Generic display views: Create View

class BookCreate(CreateView):

template_name = 'form.html'

model = Book

form_class = BookForm

# fields = ['title', 'description']

def form_valid(self, form):

form.instance.added_by = self.request.user

return super(BookCreate, self).form_valid(form)

def get_success_url(self):

return reverse('cbv:book_list')

Handle MultipleObjectReturned

class MultipleObjectMixin(obj):

def get_object(self, queryset=None, *args, **kwargs):

slug = self.kwargs.get('slug')

if slug:

try:

obj = self.model.objects.get(slug=slug)

except self.model.MultipleObjectReturned:

obj = self.get_queryset().first()

except:

raise Http404

return obj

return None

class BookDetail(MultipleObjectMixin, DetailView):

template_name = 'detail.html'

model = Book

SuccessMessageMixin

from django.contrib.messages.views import SuccessMessageMixin

class BookCreate(SuccessMessageMixin, CreateView):

template_name = 'cbv/form.html'

model = Book

success_message = "%(title)s was created at %(created_at)s"

def get_success_message(self, cleaned_data):

return self.success_message % dict(

cleaned_data,

created_at=self.object.timestamp

)

FormMixin

# views.py

from django.views.generic.edit import ModelFormMixin

class BookDetail(ModelFormMixin, DetailView):

template_name = 'detail.html'

model = Book

form_class = BookForm

def get_context_data(self, *args, **kwargs):

context = super(BookDetail, self).get_context_data(*args, **kwargs)

context['form'] = self.get_form()

context['btn_title'] = 'Update Book'

return context

def post(self, request, *args, **kwargs):

form = self.get_form()

if form.is_valid():

return self.form_valid(form)

else:

return self.form_invalid(form)

# detail.html

{% include "form.html" with form=form title="Detail View" btn_title=btn_title %}

# form.html

{% if title %}

<h1>{{ title }}</h1>

{% endif %}

<form method='POST' action=""> {% csrf_token %}

</form>

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