Django 基于类的 DeleteView 示例

Question

有谁知道或者可以请任何人制作一个简单的 Django 基于类的通用 DeleteView 示例吗？我想继承 DeleteView 并确保当前登录的用户在删除之前拥有该对象的所有权。任何帮助将不胜感激。提前谢谢你。

Answer 1

这是一个简单的：

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

class MyDeleteView(DeleteView):
    def get_object(self, queryset=None):
        """ Hook to ensure object is owned by request.user. """
        obj = super(MyDeleteView, self).get_object()
        if not obj.owner == self.request.user:
            raise Http404
        return obj

注意事项：

• DeleteView 不会在 GET 请求中删除；这是您提供确认模板的机会（您可以在 template_name 类属性中提供名称）和“是的，我确定”按钮，POSTs 到此视图
• 您可能更喜欢错误消息而不是 404？在这种情况下，请改写 delete 方法，在 get_object 调用后检查权限并返回自定义响应。
• 不要忘记提供与（可选自定义）success_url 类属性相匹配的模板，以便用户确认对象已被删除。

Answer 2

我基本上已经对一些基于类的通用视图进行了子类化来做到这一点。主要区别是我只是过滤掉了查询集。我不能保证这种方法是好是坏，但它对我来说更有意义。

请随意忽略“MessageMixin”——它只是为了使用 Django 消息框架（带有为每个视图指定的变量）轻松呈现消息。这是我为我们的网站编写的代码：

观看次数

from django.views.generic import CreateView, UpdateView, \
        DeleteView, ListView, DetailView

from myproject.core.views import MessageMixin

class RequestCreateView(MessageMixin, CreateView):
    """ 
    Sub-class of the CreateView to automatically pass the Request to the Form. 
    """
    success_message = "Created Successfully"

    def get_form_kwargs(self):
        """ Add the Request object to the Form's Keyword Arguments. """
        kwargs = super(RequestCreateView, self).get_form_kwargs()
        kwargs.update({'request': self.request})
        return kwargs

class RequestUpdateView(MessageMixin, UpdateView):
    """
    Sub-class the UpdateView to pass the request to the form and limit the
    queryset to the requesting user.        
    """
    success_message = "Updated Successfully"

    def get_form_kwargs(self):
        """ Add the Request object to the form's keyword arguments. """
        kwargs = super(RequestUpdateView, self).get_form_kwargs()
        kwargs.update({'request': self.request})
        return kwargs

    def get_queryset(self):
        """ Limit a User to only modifying their own data. """
        qs = super(RequestUpdateView, self).get_queryset()
        return qs.filter(owner=self.request.user)

class RequestDeleteView(MessageMixin, DeleteView):
    """
    Sub-class the DeleteView to restrict a User from deleting other 
    user's data.
    """
    success_message = "Deleted Successfully"

    def get_queryset(self):
        qs = super(RequestDeleteView, self).get_queryset()
        return qs.filter(owner=self.request.user)

用法

然后，您可以轻松创建自己的视图来使用此类功能。例如，我只是在我的 urls.py 中创建它们：

from myproject.utils.views import RequestDeleteView

#...

url(r'^delete-photo/(?P<pk>[\w]+)/$', RequestDeleteView.as_view(
                   model=Photo,
                   success_url='/site/media/photos',
                   template_name='site/media-photos-delete.html',
                   success_message='Your Photo has been deleted successfully.'
                   ), name='fireflie-delete-photo-form'),

表格

重要提示：我已经重载了那些 get_form_kwargs() 方法来为我的表单提供一个“请求”实例。如果您不希望将 Request 对象传递给 Form，只需删除那些重载的方法。如果您想使用它们，请按照以下示例进行操作：

from django.forms import ModelForm

class RequestModelForm(ModelForm):
    """
    Sub-class the ModelForm to provide an instance of 'request'.
    It also saves the object with the appropriate user.
    """
    def __init__(self, request, *args, **kwargs):
        """ Override init to grab the request object. """
        self.request = request
        super(RequestModelForm, self).__init__(*args, **kwargs)

    def save(self, commit=True):
        m = super(RequestModelForm, self).save(commit=False)
        m.owner = self.request.user
        if commit:
            m.save()
        return m

这比你问的要多一些——但它有助于了解如何对 Create 和 Update 视图执行相同的操作。同样的通用方法也可以应用于 ListView 和 DetailView。

MessageMixin

以防万一有人想要我使用的 MessageMixin。

class MessageMixin(object):
    """
    Make it easy to display notification messages when using Class Based Views.
    """
    def delete(self, request, *args, **kwargs):
        messages.success(self.request, self.success_message)
        return super(MessageMixin, self).delete(request, *args, **kwargs)

    def form_valid(self, form):
        messages.success(self.request, self.success_message)
        return super(MessageMixin, self).form_valid(form)

Answer 3

最简单的方法是预过滤查询集：

from django.views.generic import DeleteView


class PostDeleteView(DeleteView):
    model = Post
    success_url = reverse_lazy('blog:list_post')

    def get_queryset(self):
        owner = self.request.user
        return self.model.objects.filter(owner=owner)

Answer 4

我建议最好（也是最简单）的方法是使用UserPassesTestMixin，它可以让您更清晰地分离关注点。

例子：

from django.contrib.auth.mixins import LoginRequiredMixin, UserPassesTestMixin
from django.views.generic import DeleteView


class MyDeleteView(LoginRequiredMixin, UserPassesTestMixin, DeleteView):
    def test_func(self):
        """ Only let the user access this page if they own the object being deleted"""
        return self.get_object().owner == self.request.user