如何将查询中的值插入另一个表字段？

Question

我的模型下面有一个表格，称为订单

class Order(models.Model):

    customer = models.ForeignKey(Customer, null=True, on_delete= models.SET_NULL)
    product = models.ForeignKey(Product, null=True, on_delete= models.SET_NULL)
    date_created = models.DateTimeField(auto_now_add=True, null=True)
    status = models.CharField(max_length=200, null=True, choices=STATUS)
    note = models.CharField(max_length=1000, null=True)
    stock = models.CharField(max_length=200, null=True)
    min_stock = models.CharField(max_length=200, null=True)

在 pgadmin 4 上，我在下面进行了查询

SELECT customer_id, MAX(date_created) AS "Last_purchase" FROM public.accounts_order GROUP BY customer_id;

在下面创建了一个表

如何在 Pgadmin 4 上的 last_purchase 表中的以下客户表字段中导入最后一次购买表？

如下图，

class Customer(models.Model):



    title = models.CharField(max_length=200, null=True, choices=TITLE)
    first_name = models.CharField(max_length=200, null=True)
    middle_name = models.CharField(max_length=200, blank=True,default='')
    last_name = models.CharField(max_length=200, null=True)
    phone = models.CharField(max_length=200, null=True)
    country = CountryField()
    birth_year = models.CharField(max_length=4, null=True)
    gender = models.CharField(max_length=200, null=True, choices=GENDER)
    email = models.CharField(max_length=200, null=True)
    password = models.CharField(max_length=200, null=True)
    status = models.CharField(max_length=200, null=True,choices=STATUS)
    date_created = models.DateTimeField(auto_now=True, null=True)
    profile_pic = models.ImageField(null=True, blank=True, default='images/default.png')
    role = models.CharField(max_length=200, null=True, choices=ROLE)
    last_purchase = models.DateTimeField(blank=True, null=True)

    def __str__(self):
        return self.first_name

汞

Answer 1

应该这样做。把它放在你的模型中

@property
def last_purchase(self):
    return Order.objects.get(customer_id=self.id).Last_purchase