如何将两个表单(wagtail表单和django表单)与外键链接？

from django.db import models
from your_app.models import FormModel

class WagtailFormModel(models.Model):
    # 其他字段
    form = models.ForeignKey(FormModel, on_delete=models.CASCADE)
    # 其他字段

from your_app.models import FormModel
from your_app.forms import WagtailForm, DjangoForm

def submit_form(request):
    if request.method == 'POST':
        wagtail_form = WagtailForm(request.POST)
        django_form = DjangoForm(request.POST)
        
        if wagtail_form.is_valid() and django_form.is_valid():
            django_instance = django_form.save()  # 保存django表单数据
            wagtail_instance = wagtail_form.save(commit=False)  # 保存wagtail表单数据，但不提交到数据库
            wagtail_instance.form = django_instance  # 关联两个表单
            wagtail_instance.save()  # 提交wagtail表单数据到数据库
            
            # 其他处理逻辑
            
    # 其他代码