django - 如何在 django 通用视图中使用 format() 设置 success_mesasge？

Question

我想要实现的是这样的：

from django.contrib.auth.mixins import LoginRequiredMixin
from django.contrib.messages.views import SuccessMessageMixin
from django.views.generic import CreateView

from posts.models import Post


class PostNewView(LoginRequiredMixin, SuccessMessageMixin, CreateView):

    model = Post
    fields = ['title', 'content', 'image']
    success_message = "{} has been created successfully".format(self.post.title) 

    def form_valid(self, form):
        form.instance.author = self.request.user
        return super().form_valid(form)

但它会发生错误。有任何想法吗？

Answer 1

这不是问题format()，而是尝试引用当时不存在的属性。类级别的属性在导入时进行评估，但self.title仅在运行时存在，并且仅存在于方法中。

而不是在该级别设置消息，您应该使用以下get_success_message方法：

def get_success_message(self, cleaned_data):
    return "{} has been created successfully".format(cleaned_data['title'])