如何在Django中使用外键自动完成表单？

from django.db import models

class ChildModel(models.Model):
    name = models.CharField(max_length=50)

class ParentModel(models.Model):
    child = models.ForeignKey(ChildModel, on_delete=models.CASCADE)
    # 其他字段...

from django import forms
from .models import ParentModel

class ParentModelForm(forms.ModelForm):
    class Meta:
        model = ParentModel
        fields = '__all__'

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

def create_parent(request):
    if request.method == 'POST':
        form = ParentModelForm(request.POST)
        if form.is_valid():
            form.save()
            return redirect('success')  # 重定向到成功页面
    else:
        form = ParentModelForm()
    return render(request, 'create_parent.html', {'form': form})

<form method="post">
  {% csrf_token %}
  {{ form.as_p }}
  <button type="submit">提交</button>
</form>