Django createview创建不带外键的额外实例

from django.views.generic.edit import CreateView
from .models import ExtraInstance

class ExtraInstanceCreateView(CreateView):
    model = ExtraInstance
    fields = '__all__'

from django.db import models

class ExtraInstance(models.Model):
    name = models.CharField(max_length=100)
    # 其他字段...

<!-- extra_instance_create.html -->

<form method="POST" action="">
  {% csrf_token %}
  {{ form.as_p }}
  <button type="submit">保存</button>
</form>

from django.urls import path
from .views import ExtraInstanceCreateView

urlpatterns = [
    path('extra_instance/create/', ExtraInstanceCreateView.as_view(), name='extra_instance_create'),
]