Django中DeleteView结合SuccessMessageMixin如何传递数据到成功消息？

因为DeleteView执行删除操作后，目标对象已从数据库中移除，默认的SuccessMessageMixin无法直接获取对象字段值，不过可以通过以下两种方法实现需求：

方法一：重写get_success_message方法 #

利用DeleteView执行删除前会先通过get_object()获取目标对象并存储在self.object中的特性，直接在方法里格式化消息：

from django.views.generic.edit import DeleteView
from django.contrib.messages.views import SuccessMessageMixin
from .models import Book

class BookDeleteView(SuccessMessageMixin, DeleteView):
    model = Book
    success_url = '/books/'
    success_message = "%(title)s has been deleted"

    def get_success_message(self, cleaned_data):
        return self.success_message % {'title': self.object.title}

方法二：重写delete方法自定义消息 #

如果需要更灵活的消息控制，可以先保存待删除对象的信息，再执行删除并手动添加消息：

from django.views.generic.edit import DeleteView
from django.contrib import messages
from .models import Book

class BookDeleteView(DeleteView):
    model = Book
    success_url = '/books/'

    def delete(self, request, *args, **kwargs):
        # 提前获取待删除对象
        deleted_book = self.get_object()
        # 执行父类的删除逻辑
        response = super().delete(request, *args, **kwargs)
        # 添加带具体信息的成功消息
        messages.success(request, f"{deleted_book.title} has been deleted")
        return response

内容的提问来源于stack exchange，提问作者Sean Rasmussen