如何在admin.py中访问当前用户

from django.contrib import admin
from django.contrib.auth.models import User
from .models import MyModel

class MyModelAdmin(admin.ModelAdmin):
    def save_model(self, request, obj, form, change):
        # 在保存模型实例之前，可以访问当前用户
        obj.modified_by = request.user
        super().save_model(request, obj, form, change)

    def get_queryset(self, request):
        qs = super().get_queryset(request)
        if request.user.is_superuser:
            return qs
        return qs.filter(created_by=request.user)

admin.site.register(MyModel, MyModelAdmin)

MIDDLEWARE = [
    ...
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    ...
]