In Django, how do I know the currently logged-in user?

Question

在 Django 中，我如何知道当前登录的用户？

Answer 1

Where do you need to know the user?

In views the user is provided in the request as request.user .

For user-handling in templates see here

If you want to save the creator or editor of a model's instance you can do something like:

model.py

class Article(models.Model):
    created_by = models.ForeignKey(User, related_name='created_by')
    created_on = models.DateTimeField(auto_now_add = True)
    edited_by  = models.ForeignKey(User, related_name='edited_by')
    edited_on  = models.DateTimeField(auto_now = True)
    published  = models.BooleanField(default=None)

admin.py

class ArticleAdmin(admin.ModelAdmin):
    fields= ('title','slug','text','category','published')
    inlines = [ImagesInline]
    def save_model(self, request, obj, form, change): 
        instance = form.save(commit=False)
        if not hasattr(instance,'created_by'):
            instance.created_by = request.user
        instance.edited_by = request.user
        instance.save()
        form.save_m2m()
        return instance

    def save_formset(self, request, form, formset, change): 

        def set_user(instance):
            if not instance.created_by:
                instance.created_by = request.user
            instance.edited_by = request.user
            instance.save()

        if formset.model == Article:
            instances = formset.save(commit=False)
            map(set_user, instances)
            formset.save_m2m()
            return instances
        else:
            return formset.save()

I found this on the Internet, but I don't know where anymore

Answer 2

Extending @vikingosegundo's answer, if you want to get the username inside Models, I found a way that involves declaring a MiddleWare. Create a file called get_username.py inside your app, with this content:

from threading import current_thread

_requests = {}

def get_username():
    t = current_thread()
    if t not in _requests:
         return None
    return _requests[t]

class RequestMiddleware(object):
    def process_request(self, request):
        _requests[current_thread()] = request

Edit your settings.py and add it to the MIDDLEWARE_CLASSES :

MIDDLEWARE_CLASSES = (
    ...
    'yourapp.get_username.RequestMiddleware',
)

Now, in your save() method, you can get the current username like this:

from get_username import get_username

...

def save(self, *args, **kwargs):
    req = get_username()
    print "Your username is: %s" % (req.user)

Answer 3

Django 1.9.6 default project has user in the default templates

So you can write things like this directly:

{% if user.is_authenticated %}
    {{ user.username }}
{% else %}
    Not logged in.
{% endif %}

This functionality is provided by the django.contrib.auth.context_processors.auth context processor in settings.py .

Dedicated template question: How to access the user profile in a Django template?

Answer 4

You just need to request current user:

 def foo():
         current_user = request.user
         return print(current_user)
 foo()