如何在django中执行管理操作来下载用户的pdf文件

from django.http import HttpResponse
from django.conf import settings
import os

def download_pdf(request, file_name):
    file_path = os.path.join(settings.MEDIA_ROOT, file_name)
    if os.path.exists(file_path):
        with open(file_path, 'rb') as pdf:
            response = HttpResponse(pdf.read(), content_type='application/pdf')
            response['Content-Disposition'] = 'attachment; filename="{}"'.format(file_name)
            return response
    else:
        return HttpResponse("File not found.")

from django.urls import path
from . import views

urlpatterns = [
    path('download_pdf/<str:file_name>/', views.download_pdf, name='download_pdf'),
]

<a href="{% url 'download_pdf' file_name %}">Download PDF</a>

MEDIA_ROOT = os.path.join(BASE_DIR, 'media')
MEDIA_URL = '/media/'