Django管理页面添加另存为pdf按钮

from django.urls import path
from .views import generate_pdf

urlpatterns = [
    # 其他URL路由
    path('generate_pdf/', generate_pdf, name='generate_pdf'),
]

from django.shortcuts import render
from django.http import HttpResponse
from reportlab.pdfgen import canvas

def generate_pdf(request):
    response = HttpResponse(content_type='application/pdf')
    response['Content-Disposition'] = 'attachment; filename="example.pdf"'

    # 创建一个PDF对象
    p = canvas.Canvas(response)

    # 在PDF中添加内容
    p.drawString(100, 100, "Hello World!")

    # 结束PDF对象的编辑
    p.showPage()
    p.save()

    return response

{% extends "admin/change_form.html" %}

{% block object-tools-items %}
    {{ block.super }}
    <li>
        <a href="{% url 'admin:generate_pdf' %}" class="btn btn-default" target="_blank">
            <span class="glyphicon glyphicon-save-file"></span> 另存为PDF
        </a>
    </li>
{% endblock %}