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覆盖 django CreateView 的表单

也许只是另一个愚蠢的初学者问题：我在覆盖 django 模型表单时遇到问题，该表单当前在views.py 中使用以下代码。

下面的代码运行良好！

class PostCreateView(LoginRequiredMixin, CreateView):
    model = Post
    fields = ['title', 'content']

    ### want this instead of line 1 and 2 above --> form_class = PostCreateForm()

    view_args = collections.namedtuple('view_args', ['page_title'])
    view_args = view_args(page_title="Create Post")

    def get_context_data(self, *args, **kwargs):
        self.tgt_url_args = MyHelper.parse_tgt_url(self)
        context = super(PostCreateView, self).get_context_data(*args, **kwargs)
        context.update(MyHelper.get_context_metadata(self, self.tgt_url_args, PostCreateView.view_args))
        return context

    def form_valid(self, form):
        form.instance.author = self.request.user
        tgt_url_args = MyHelper.parse_tgt_url(self)
        blog_article = Article.objects.get(pk=tgt_url_args.get('Article', '0'))
        form.instance.article_field = blog_article
        return super().form_valid(form)

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但是，我想覆盖表单以便向字段添加占位符。所以我将第 1 行和第 2 行替换为：