如何在user_passes_test decorator可调用函数中传递Django请求对象 [英] How to pass Django request object in user_passes_test decorator callable function

问题描述

我正在使用Django user_passes_test装饰器来检查用户权限。

I am using Django user_passes_test decorator to check the User Permission.

@user_passes_test(lambda u: has_add_permission(u, "project"))
def create_project(request):
......

我正在调用一个回调函数has_add_permission，它使用两个参数User和一个String。我想传递请求对象一起是可能的吗？此外，任何人都可以告诉我如何才能直接访问装饰器中的User对象。

I am calling a callback function has_add_permission which takes two arguments User and a String. I would like to pass the request object along with it is that possible? Also, can anyone please tell me how are we able to access the User object inside the decorator directly.

推荐答案

不，您不能向 user_passes_test 传递请求。要理解为什么和如何运作，只需转到来源：

No, you cannot pass request to user_passes_test. To understand why and how it works, just head over to the source:

def user_passes_test(test_func, login_url=None, redirect_field_name=REDIRECT_FIELD_NAME):
    """
    Decorator for views that checks that the user passes the given test,
    redirecting to the log-in page if necessary. The test should be a callable
    that takes the user object and returns True if the user passes.
    """

    def decorator(view_func):
        @wraps(view_func, assigned=available_attrs(view_func))
        def _wrapped_view(request, *args, **kwargs):
            if test_func(request.user):
                return view_func(request, *args, **kwargs)
            path = request.build_absolute_uri()
            # If the login url is the same scheme and net location then just
            # use the path as the "next" url.
            login_scheme, login_netloc = urlparse.urlparse(login_url or
                                                        settings.LOGIN_URL)[:2]
            current_scheme, current_netloc = urlparse.urlparse(path)[:2]
            if ((not login_scheme or login_scheme == current_scheme) and
                (not login_netloc or login_netloc == current_netloc)):
                path = request.get_full_path()
            from django.contrib.auth.views import redirect_to_login
            return redirect_to_login(path, login_url, redirect_field_name)
        return _wrapped_view
    return decorator

这是 user_passes_test 装饰器背后的代码。如你所见，测试函数传递给装饰器（在你的情况下， lambda u：has_add_permission（u，project））只传递一个参数 request.user 。现在，当然可以编写自己的装饰器（甚至直接复制这个代码，只是修改它）也可以通过请求本身，但是你不能这样做默认的 user_passes_test 实现。

This is the code behind the user_passes_test decorator. As you can see, the test function passed to the decorator (in your case, lambda u: has_add_permission(u, "project")) is passed just one argument, request.user. Now, it's of course possible to write your own decorator (even copying this code directly and just modifying it) to also pass the request itself, but you can't do it with the default user_passes_test implementation.

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