Get current user log in signal in Django

Question

I am just using the admin site in Django. I have 2 Django signals (pre_save and post_save). I would like to have the username of the current user. How would I do that? It does n

Answer 1

We can solve this problem using middleware classes. Create singleton class in where will be storing user variable.

class Singleton(type):
    '''
        Singleton pattern requires for GetUser class
    '''
    def __init__(cls, name, bases, dicts):
        cls.instance = None

    def __call__(cls, *args, **kwargs):
        if cls.instance is None:
            cls.instance = super(Singleton, cls).__call__(*args, **kwargs)
        return cls.instance 


class NotLoggedInUserException(Exception):
    '''
    '''
    def __init__(self, val='No users have been logged in'):
        self.val = val
        super(NotLoggedInUser, self).__init__()

    def __str__(self):
        return self.val

class LoggedInUser(object):
    __metaclass__ = Singleton

    user = None

    def set_user(self, request):
        if request.user.is_authenticated():
            self.user = request.user

    @property
    def current_user(self):
        '''
            Return current user or raise Exception
        '''
        if self.user is None:
            raise NotLoggedInUserException()
        return self.user

    @property
    def have_user(self):
    return not user is None

Create own middleware class that will be setting user for LoggedInUser instance,and insert out middleware after 'django.contrib.auth.middleware.AuthenticationMiddleware' in settings.py

from useranytimeaccess import LoggedInUser
class LoggedInUserMiddleware(object):
    '''
        Insert this middleware after django.contrib.auth.middleware.AuthenticationMiddleware
    '''
    def process_request(self, request):
        '''
            Returned None for continue request
        '''
        logged_in_user = LoggedInUser()
        logged_in_user.set_user(request)
        return None

In signals import LoggedInUser class and get current user

logged_in = LoggedInUser()
user = logged_in.user