Question

我正在尝试拆分现有的模型类。原始类不是最佳的，因此我想将CustomerOrder中的所有客户相关信息移动到新的Customer类中。在Django中执行此操作的最佳方法是什么？

旧模型类：

class CustomerOrder(models.Model):

    # Customer information fields
    first_name = models.CharField(max_length=200)       # Customer first name
    last_name = models.CharField(max_length=200)        # Customer last name
    email = models.EmailField()                 # Customer email address
    address = models.CharField(max_length=255)      # Address to deliver (e.g. 1532 Commonwealth St. Apt 302)
    city = models.CharField(max_length=200)         # City to deliver   (e.g. Fullerton, CA 92014)

    # Order information fields
    note = models.TextField()           # Any notes the customer may have about shipping
    shipping_method = models.CharField(max_length=200)      # Shipping in LA or OC
    total_price = models.FloatField(default=0)              # Total price of the order
    delivery_date = models.DateField()  # When to deliver the order. Order is "live" until the next 
                            # day after delivery. So if delivery date is Jan 3, it's "live" until Jan 4.

    order_date = models.DateField()     # When the customer ordered
    time_slot = models.CharField(max_length=200)            # What time to deliver the product
    is_cancelled = models.BooleanField(default=False)       # If the order is cancelled or refunded, we mark it here.

    created_at = models.DateTimeField(auto_now_add=True)    # When the order entry was saved into database
    updated_at = models.DateTimeField(auto_now=True)        # When the order was last updated in database

    def __str__(self):
        return self.first_name + " " + self.last_name

新模型类：

class Customer(models.Model):
    first_name = models.CharField(max_length=200)       # Customer first name
    last_name = models.CharField(max_length=200)        # Customer last name
    email = models.EmailField()                 # Customer email address
    address = models.CharField(max_length=255)      # Address to deliver (e.g. 1532 Commonwealth St. Apt 302)
    city = models.CharField(max_length=200)         # City to deliver   (e.g. Fullerton, CA 92014)

旧模型中有重复项，所以我也希望删除它们。

Answer 1

这取决于您的数据库类型。 read this

你应该小心不要丢失数据！

Answer 2

我认为问题更多地与整个关系数据库架构有关。

我会将所有与客户相关的内容放在一个表中，就像您拥有的新CustomerOrder（重命名为Customer）类一样，然后为Orders创建另一个类，然后将这两个类链接为一对多关系。例如，一个客户可以下多个订单。如果要实现这一对多关系，只需将以下内容添加到订单类：

{{1}}

现在，当您创建新订单实例时，您可以分配客户。附：反向访问，即从客户订购，你基本上做customer.order_set（）方法（客户可以下多个订单）。

django models.py - 从一个模型类迁移到另一个模型类

2 个答案: