Question

我想为每个具有不同权限的用户显示不同的内容，我试图从ModelForm类的init()函数中获取当前用户，但失败

下面的代码是我当前在ModelForm中的init（）

def __init__(self, *args, **kwargs):

    self.user = kwargs.pop('user',None)
    super(MyForm, self).__init__(*args, **kwargs)

但是self.user仅在表单发送后才起作用，例如在is_valid()函数或clean_data()函数中

我总是在self.user中获得init()的“无”值我是否应该继续尝试在ModelForm init()中获取当前用户，还是有更好的方法来实现这种功能？

Answer 1

您需要从View发送此数据。例如，在Generic Class Based Edit View中，您可以使用get_form_kwargs()：

class YourView(FormView):
   form_class = YourForm
   ...

   def get_form_kwargs(self):
    kwargs = super(YourView, self).get_form_kwargs()
    kwargs['user'] = self.request.user
    return kwargs

在其他情况下，通过传递已知参数user来初始化表单：

def some_view(request):
    form = YourForm(request.POST, user=request.user)

Answer 2

f = MyForm(user=request.user) // where you are calling the form in the view

，构造函数将如下所示：

class MyForm(forms.ModelForm):
    def __init__(self, *args, **kwargs):
         self.user = kwargs.pop('user',None)
         super(MyForm, self).__init__(*args, **kwargs)

Answer 3

在项目文件夹中创建一个新文件，并将其命名为middleware.py：

from __future__ import absolute_import, division, print_function

try:
    from threading import local
except ImportError:
    from django.utils._threading_local import local

_thread_locals = local()

def get_current_request():
    """ returns the request object for this thread """
    return getattr(_thread_locals, "request", None)

def get_current_user():
    """ returns the current user, if exist, otherwise returns None """
    request = get_current_request()
    if request:
        return getattr(request, "user", None)

class ThreadLocalMiddleware(object):
    """ Simple middleware that adds the request object in thread local stor    age."""

    def process_request(self, request):
        _thread_locals.request = request

    def process_response(self, request, response):
        if hasattr(_thread_locals, 'request'):
    del _thread_locals.request
        return response

然后，配置您的设置文件：

settings.py：

MIDDLEWARE = [ ... “ YOUR_PROJECT_NAME.middleware.ThreadLocalMiddleware”， ]

在要获得当前用户的任何地方使用函数get_current_user（）。示例 models.py：

from YOUR_PROJECT_NAME.middleware import get_current_user

...

Class SomeModel(models.Model):
    ...

    def some_method(self):
        current_user = get_current_user()
        ....

如何在ModelForm init（）中获得当前用户？

3 个答案: