Django中DetailView结合FormMixin用法？能否直接重写post方法？

当然可以！完全不需要用多个类包装的方式，直接在DetailView里重写post方法就能把表单处理逻辑合并到一个类中，大幅简化代码。

原实现代码： #

from django.views import View
from django.views.generic.detail import DetailView
from django.views.generic.edit import SingleObjectMixin, FormView
from django.urls import reverse
from .models import Article
from .forms import CommentForm

class CommentGet(DetailView): 
    model = Article
    template_name = "article_detail.html"
    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context["form"] = CommentForm()
        return context

class CommentPost(SingleObjectMixin, FormView): 
    model = Article
    form_class = CommentForm
    template_name = "article_detail.html"
    def post(self, request, *args, **kwargs):
        self.object = self.get_object()
        return super().post(request, *args, **kwargs)
    def form_valid(self, form):
        comment = form.save(commit=False)
        comment.article = self.object
        comment.save()
        return super().form_valid(form)
    def get_success_url(self):
         article = self.get_object()
         return reverse("article_detail", kwargs={"pk": article.pk})

class CView(View):
    def get(self, request, *args, **kwargs):
        view = CommentGet.as_view()
        return view(request, *args, **kwargs)

    def post(self, request, *args, **kwargs):
        view = CommentPost.as_view()
        return view(request, *args, **kwargs)

简化后的完整实现： #

from django.views.generic.detail import DetailView
from django.shortcuts import redirect
from django.urls import reverse
from .models import Article
from .forms import CommentForm

class ArticleDetailView(DetailView):
    model = Article
    template_name = "article_detail.html"

    # 把评论表单传入模板上下文，和原逻辑一致
    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context["form"] = CommentForm()
        return context

    # 重写post方法处理表单提交
    def post(self, request, *args, **kwargs):
        # 获取当前文章对象
        self.object = self.get_object()
        # 用POST数据实例化表单
        form = CommentForm(request.POST)
        
        if form.is_valid():
            # 创建评论但暂不提交到数据库
            comment = form.save(commit=False)
            # 关联当前文章
            comment.article = self.object
            comment.save()
            # 提交成功后重定向回文章详情页
            return redirect(reverse("article_detail", kwargs={"pk": self.object.pk}))
        
        # 表单验证失败时，把错误表单放回上下文，重新渲染页面
        context = self.get_context_data(**kwargs)
        context["form"] = form
        return self.render_to_response(context)

简化逻辑说明： #

• 保留get_context_data方法来给模板传递空表单，保证GET请求时页面正常渲染表单
• 重写post方法统一处理表单提交：
  1. 先拿到当前文章对象，和原CommentPost类的逻辑一致
  2. 验证表单数据，通过就创建关联文章的评论并保存
  3. 验证失败时，把带错误信息的表单放回上下文，用户能在原页面看到错误提示
• 整个逻辑都集中在一个类里，不需要再做视图转发，代码更简洁易维护

内容的提问来源于stack exchange，提问作者aaaa