Django的View视图类self.request和request

Question

View中setup()函数:

def setup(self, request, *args, **kwargs):
    """Initialize attributes shared by all view methods."""
    self.request = request
    self.args = args
    self.kwargs = kwargs

view视图:

from django.views.generic import View
class IndexView(View):
    def get(self, request, *args, **kwargs):
        return render(self.request, 'index.html')

如果get()函数没有接收request就会报出如下错误:

TypeError: get() takes 1 positional argument but 2 were given~

既然View.setup函数已经将request对象赋值给self.request,get()函数所接收的request和self.request相同,
为什么我还需要在IndexView.get函数中重新接收一遍呢?

Answer 1

为了能够回答你的问题，特地去GitHub看了源码： https://github.com/django/django/blob/stable/1.3.x/django/views/generic/base.py

时间序列：

• 1.3版本引入了 base.py 即 class View.

@classonlymethod

def as_view(cls, **initkwargs):
    # ...

    def view(request, *args, **kwargs):

        self = cls(**initkwargs)

        return self.dispatch(request, *args, **kwargs)

    # take name and docstring from class

    update_wrapper(view, cls, updated=())

• 2.2版本出现了View.setup()

查看代码：Fixed #29750 -- Added View.setup() hook for class-based views.

具体原因可查看：https://github.com/django/django/pull/10427

---

看到这里，应该能知道原因了吧。