如何通过一次 post，保存到 2 个表？

目前我通过爬虫获取到了商品详情信息，想通过 post 提交保存到我的商品表，并且在保存数据的同时将其放入到购物车里，购物车里的商品信息是通过与商品表关联获取。应该怎么实现呢？

新手求指点。。

# 购物车模型
from django.db import models
from goods.models import Goods


class Cart(models.Model):
	cart_id = models.CharField(max_length=250, blank=True, verbose_name="购物车 id")
	add_time = models.DateField(auto_now_add=True, verbose_name="创建时间")

	class Meta:
		db_table = "Cart"
		ordering = ['add_time']
		verbose_name ='购物车'
		verbose_name_plural = verbose_name

	def __str__(self):
		return self.cart_id


class CartItem(models.Model):
	goods = models.ForeignKey(Goods, on_delete=models.CASCADE, verbose_name="商品名")
	cart = models.ForeignKey(Cart, on_delete=models.CASCADE, verbose_name="购物车 id")
	quantity = models.IntegerField(verbose_name="商品数量")
	active = models.BooleanField(default=True)

	class Meta:
		db_table = "CartItem"
		verbose_name = "购物车商品"
		verbose_name_plural = verbose_name

	def sub_total(self):
		return self.goods.good_price * self.quantity

	def __str__(self):
		return self.goods
			

# from 提交保存到商品表
def post(self, request):
        user = UserProfile.objects.get(username=request.user)
        new_goods = Goods(goods_user=user)
        goods_from = goodsForm(request.POST, instance=new_goods)
        if goods_from.is_valid():
            goods_from.save()
            return redirect('cart:cart_detail')
        else:
            goods_from =goodsForm()
        return redirect('index')

# 添加到购物车
def add_cart(request, goods_id):
	goods = Goods.object.get(id=goods_id)
	try:
		cart = Cart.object.get(cart_id=_cart_id)
	except Cart.DoseNotExist:
		cart = Cart.object.create(
				cart_id = _cart_id(request)
			)
		cart.save(),
	try:
		cart_item = CartItem.object.get(goods=goods, cart=cart)
		cart_item.quantity +=1
		cart_item.save()
	except CartItem.DoseNotExist:
		cart_item = CartItem.object.create(
				goods = goods,
				quantity = 1,
				cart = cart
			)
		cart_item.save()
	return redirect('cart:cart_detail')