Django - get_context_data() 缺少 1 个必需的位置参数：'form'答案

【问题标题】：Django - get_context_data() missing 1 required positional argument: 'form'Django - get_context_data() 缺少 1 个必需的位置参数：'form'
【发布时间】：2020-09-08 15:44:32
【问题描述】：

我正在尝试将 inlineformset 添加到 Django 博客项目。我收到了帖子，我想通过基于类的视图将多个图像添加到帖子中。但是当我尝试 get_context_data 时，我收到了这个错误：

get_context_data() 缺少 1 个必需的位置参数：'form'

模型.py：

class Post(models.Model):
    title = models.CharField(max_length=100)
    content = RichTextField(blank=True, null=True)

class PostImage(models.Model):
    post = models.ForeignKey(Post, default=None, on_delete=models.CASCADE)
    image = models.ImageField(upload_to='gallery/')
    description = models.CharField(max_length=300, blank=True)

Forms.py

class CreatePostForm(forms.ModelForm):
     class Meta:
         model = Post
         fields = ['title' , 'content' ]

PostImageFormSet = inlineformset_factory(Post, PostImage, fields=['image', 'description'], exclude=['post'] , max_num=30, extra=3)

Views.py

class PostCreateView(LoginRequiredMixin, CreateView):

     form_class = CreatePostForm
     template_name = 'blog/post_form.html'

     def get_context_data(self, form):
         context = super(PostCreateView. self).get_context_data(**kwargs)
         if self.request.POST:
             context['post_images'] = PostImageFormSet(self.request.POST)
         else:
             context['post_images'] = PostImageFormSet()
         return context

      def form_valid(self, form):
          context = self.get_context_data(form=form)
          formset = context['post_images']
          form.instance.author = self.request.user
          if formset.is_valid():
              response = super().form_valid(form)
              formset.instance = self.object
              formset.save()
              return response
          else:
              return super().form_invalid(form)

知道为什么我会收到这种错误吗？谢谢。

【问题讨论】：

标签： python django inline-formset

【解决方案1】：

您应该删除form 参数。 get_context_data 无论如何都不会使用该表单：

class PostCreateView(LoginRequiredMixin, CreateView):
     form_class = CreatePostForm
     template_name = 'blog/post_form.html'

     def get_context_data(self, *args, **kwargs):
         context = super().get_context_data(*args, **kwargs)
         if self.request.POST:
             context['post_images'] = PostImageFormSet(self.request.POST)
         else:
             context['post_images'] = PostImageFormSet()
         return context

      def form_valid(self, form):
          context = self.get_context_data()
          formset = context['post_images']
          form.instance.author = self.request.user
          if formset.is_valid():
              response = super().form_valid(form)
              formset.instance = self.object
              formset.save()
              return response
          else:
              return super().form_invalid(form)

【讨论】：

你把OP的context = super(PostCreateView. self).get_context_data(**kwargs)改成context = super().get_context_data(*args, **kwargs)，指定当前类视图名和不做有什么区别？
@Elias：两者是等价的，但是不命名基类的好处是您可以轻松地将其复制粘贴到其他地方。从 Python-3.x 开始，不再需要命名基类。