如何在同一个Django HTML页面中使用Create()和Update()？

# urls.py
from django.urls import path
from .views import create_update_view

urlpatterns = [
    path('create_update/', create_update_view, name='create_update_view'),
]

# models.py
from django.db import models

class Task(models.Model):
    description = models.CharField(max_length=200)

# forms.py
from django import forms
from .models import Task

class TaskForm(forms.ModelForm):
    class Meta:
        model = Task
        fields = ['description']

# views.py
from django.shortcuts import render
from .forms import TaskForm
from .models import Task

def create_update_view(request):
    task_id = request.GET.get('id')
    if task_id:
        task = Task.objects.get(id=task_id)
    else:
        task = None

    if request.method == 'POST':
        form = TaskForm(request.POST, instance=task)
        if form.is_valid():
            form.save()
    else:
        form = TaskForm(instance=task)

    context = {'form': form}
    return render(request, 'task_form.html', context)

# task_form.html
<form method="POST">
  {% csrf_token %}
  {{ form.as_p }}
  <button type="submit">Save</button>
</form>