Django2.x-使用ModelForm在表单中创建一个包含无限制项的列表

from django.db import models

class Item(models.Model):
    name = models.CharField(max_length=100)
    quantity = models.IntegerField()

from django import forms
from .models import Item

class ItemForm(forms.ModelForm):
    class Meta:
        model = Item
        fields = ['name', 'quantity']

from django.shortcuts import render, redirect
from .forms import ItemForm

def item_list(request):
    if request.method == 'POST':
        form = ItemForm(request.POST)
        if form.is_valid():
            form.save()
            return redirect('item_list')
    else:
        form = ItemForm()
    items = Item.objects.all()
    return render(request, 'item_list.html', {'form': form, 'items': items})

<!-- item_list.html -->
<form method="post">
  {% csrf_token %}
  {{ form.as_p }}
  <button type="submit">保存</button>
</form>

<ul>
  {% for item in items %}
    <li>{{ item.name }} - {{ item.quantity }}</li>
  {% empty %}
    <li>列表为空</li>
  {% endfor %}
</ul>