将多个值包装在单个 JSON 中并存储在模型中 - Django

Question

我想在单个 JSON 字段中存储多个输入。

这是订单表，有一个“attribute_field”我想在这个字段中存储属性 作为 JSON。

models.py

class Order(models.Model):
    order_id = models.AutoField("Order ID", primary_key=True)
    user_id = models.ForeignKey(User, on_delete=models.CASCADE, null=False, verbose_name="Customer ID")
    prod_id = models.ForeignKey(Product, on_delete=models.CASCADE, null=False, verbose_name="Product ID")
    quantity = models.ImageField('Product Quantity', max_length=10, default=500)
    attribute_value = models.CharField("Item Details JSON", max_length=2000, null=False)
    order_price = models.DecimalField(max_digits=8, decimal_places=2, default=0000.00)

views.py

def order(request, id):
    if request.method == 'POST':
        customer_id = request.user.user_id
        product_id = id
        try:
            size = request.POST['size']
        except MultiValueDictKeyError:
            pass

        try:
            Colour = request.POST['Color']
        except MultiValueDictKeyError:
            pass

        try:
            Paper_Choice = request.POST['PaperChoice']
        except MultiValueDictKeyError:
            pass

    return render(request, 'user/order.html')

这里我没有做表单保存方法，但是让我解释一下我想要做什么。

我想将 SIZE、COLOR、PAPER CHOICE 包装成单个 JSON 并将其存储在模型的 attribut_values 字段中但不知道该怎么做，请您解释一下。

Answer 1

如果你的 Django 版本 >= 3.1，你可以使用JSONField，否则使用TextField。 像这样的：

class Order(models.Model):
    user = models.ForeignKey(User, on_delete=models.CASCADE, verbose_name="Customer")
    prod = models.ForeignKey(Product, on_delete=models.CASCADE, verbose_name="Product")
    quantity = models.ImageField('Product Quantity', max_length=10, default=500)
    attribute_value = models.TextField("Item Details JSON")
    price = models.DecimalField(max_digits=8, decimal_places=2, default=0)

views.py

def order(request, id):
    if request.method == 'POST':
        customer = request.user
        product_id = id
        try:
            size = request.POST['size']
        except MultiValueDictKeyError:
            pass

        try:
            Colour = request.POST['Color']
        except MultiValueDictKeyError:
            pass

        try:
            Paper_Choice = request.POST['PaperChoice']
        except MultiValueDictKeyError:
            pass
        order = Order.objects.filter(user=customer, prod=product_id).first()
        value = dict(size=size, Colour=Colour, Paper_Choice=Paper_Choice)
        order.attribute_value = json.dumps(value)
        order.save()

    return render(request, 'user/order.html', {'order': order})