如何使用初始数据子类化 django 的通用 CreateView? [英] How to subclass django's generic CreateView with initial data?

问题描述

我正在尝试创建一个对话框，该对话框使用 jquery 的 .load() 函数以呈现的 django 形式发出声音..load 函数传递了警报"对象的 pk.类函数中还可以使用诸如 self.request.user 之类的东西，因此我可以预先填充这些字段，如下面的消息模型 (models.py) 所示:

I'm trying to create a dialog which uses jquery's .load() function to slurp in a rendered django form. The .load function is passed the pk of the "alert" object. Also available in the class functions are things like self.request.user so I can pre-fill those fields, shown below in the Message model (models.py):

class Message(models.Model):

    user = models.ForeignKey(User)
    alert = models.ForeignKey(Alert)
    date = models.DateTimeField()
    message = models.TextField()

对 django 的 CreateView 进行子类化使得使用 ModelForm (views.py) 的实例生成上下文变得非常容易:

Subclassing django's CreateView makes it pretty easy to generate a context with an instance of the ModelForm (views.py):

class MessageDialogView(CreateView):
    """ show html form fragment """
    model = Message
    template_name = "message.html"

    def get_initial(self):
        super(MessageDialogView, self).get_initial()
        alert = Alert.objects.get(pk=self.request.POST.get("alert_id"))
        user = self.request.user
        self.initial = {"alert":alert.id, "user":user.id, "message":"test"}
        return self.initial


    def post(self, request, *args, **kwargs):
        super(MessageDialogView, self).post(request, *args, **kwargs)
        form_class = self.get_form_class()
        form = self.get_form(form_class)
        context = self.get_context_data(form=form)
        return self.render_to_response(context)

这里的问题是 self.initial 没有被表单渲染.我已经确保表单确实在调用 get_initial 并且表单实例在 post 中具有正确的初始数据，但是当表单在模板 message 中呈现时.html 它不会像我期望的那样获取任何初始数据.有什么特别的技巧可以让它发挥作用吗?我已经搜索了文档(似乎缺少关于基于泛型的类视图的示例)和源代码，但我看不出我遗漏了什么.

The problem here is that self.initial does not get rendered with the form. I have insured that the form is indeed calling get_initial and the form instance has the proper initial data in post, but when the form is rendered in the template message.html it doesn't grab any of the initial data like I would expect. Is there a special trick to get this to work? I've scoured the docs (seems to be lacking examples on generic based class views) and source but I can't see what I'm missing.

推荐答案

get_initial() 应该只返回一个字典，而不是设置 self.initial.

get_initial() should just return a dictionary, not be bothered with setting self.initial.

你的方法应该是这样的:

Your method should look something like this:

def get_initial(self):
    # Get the initial dictionary from the superclass method
    initial = super(YourView, self).get_initial()
    # Copy the dictionary so we don't accidentally change a mutable dict
    initial = initial.copy()
    initial['user'] = self.request.user.pk
       # etc...
    return initial

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