CreateView, UpdateView and DeleteView in Django 1.3

Category: /blog /django
Tags: django

Django的官方文档里关于CreateView/UpdateView/DeleteView的generic views的资料实在是语焉不详. 我对着django test case来总结一下基本的使用情况. 后来发现stackoverflow上这帖子写得很好

CreateView

CreateView的文档里讲CreateView有两个Mixin, 我还不太明白怎么用ProcessFormview.

  • django.views.generic.edit.ModelFormMixin
  • django.views.generic.edit.ProcessFormView

下面是一个最简单的CreateView的使用例子: 要定义一个view, 就要先有Model, ModelForm, template, 然后才能定义view.

# in views.py
from django.views.generic.edit import CreateView
class AuthorCreateView(CreateView):
    # form_class告诉CreateView怎么处理model class
    # AuthorForm是一个ModelForm, 里面关联了Author
    form_class = AuthorForm 

    # template_name告诉CreateView用哪个html显示
    template_name = 'author_new.html'

    # success_url 是处理完form后的redirect
    success_url = 'success'

# in urls.py
('^authors/create/$', Author.AuthorCreateView.as_view()),

这里有一个值得注意的是success_url, 在Django 1.3里如果直接用reverse来调用urls.py里的名字的话会出错ViewDoesNotExist, 解决办法是

reverse_lazy = lambda name=None, *args : lazy(reverse, str)(name, args=args)

出处

UpateView

如果有了Model/ModelForm/Template, UpdateView和CreateView很相似.

in urls.py
url(r'^category/edit/(?P<pk>\d+)/$',                                      
    login_required(CategoryUpdateView.as_view()),                         
    name='channel_blog_category_edit'), 

in views.py
class CategoryUpdateView(UpdateView):
    model=Category
    form_class = CategoryForm
    template_name = 'channel_blog/category_form.html'
    success_url = reverse_lazy('channel_blog_my_categories')

DeleteView

Basic example:

from django.views.generic import DeleteView
from django.http import Http404

class MyDeleteView(DeleteView):
    def get_object(self, queryset=None):
        obj = super(MyDeleteView, self).get_object()
        if not obj.owner == self.request.user:
            raise Http404
        return obj

这里要注意的几个地方:

  • DeleteView需要POST request, 你要用Javascript或是一个提示来提交一个POST.
  • 在我的代码get_object里有一个偷懒的地方是没有提示错误信息, 可以先加到context里再转到Http404
  • 还可以override delete(),

下面是我的另一个例子

class CategoryDeleteView(DeleteView):
    model=Category
    form_class = CategoryForm 
    success_url = reverse_lazy('channel_blog_my_categories')

    def get_object(self):
        """
        * The DeleteView won't delete on GET requests; this is your opportunity to provide a confirmation template (you can provide the name in the template_name class attribute) with a "Yes I'm sure" button which POSTs to this view
        * You may prefer an error message to a 404? In this case, override the delete method instead, check permissions after the get_object call and return a customised response.
        * Don't forget to provide a template which matches the (optionally customisable) success_url class attribute so that the user can confirm that the object has been deleted.
        """
        category= get_object_or_404(Category, pk=self.kwargs['pk'],
            user=self.request.user)
        return category

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