帮助我针对以下代码画一个类图from django.db import models from django.db.models import Sum from django.contrib.auth.models import User from introduction.models import ScenicSpot # Create your models here. class OrderStatus(models.TextChoices): NOT_PAID = ('r', "ready to pay") PAID = ('p', "paid") class Order(models.Model): name = models.CharField(max_length=50) status = models.CharField(max_length=30, choices=OrderStatus.choices) purchase_time = models.DateField(auto_now_add=True) user = models.ForeignKey(User, related_name="orders", on_delete=models.CASCADE) def caculate_total_price(self): total_price = self.tickets.aggregate(total=Sum('scenic_spot__ticket_price')).get('total') return total_price class Ticket(models.Model): name = models.CharField(max_length=200) order = models.ForeignKey(Order, related_name="tickets", on_delete=models.CASCADE) scenic_spot = models.ForeignKey(ScenicSpot, related_name="tickets", on_delete=models.CASCADE)

根据给出的代码，可以画出以下类图：

+------------------+          +------------------+
|    OrderStatus   |          |      Order       |
+------------------+          +------------------+
| - NOT_PAID: str  |          | - name: str      |
| - PAID: str      |          | - status: str    |
+------------------+          | - purchase_time: |
                               |   date          |
                               | - user: User     |
                               +------------------+
                               | - calculate_total_price()|
                               +------------------+
                                         |
                                         |
                             +------------------+
                             |      Ticket      |
                             +------------------+
                             | - name: str      |
                             | - order: Order   |
                             | - scenic_spot:   |
                             |   ScenicSpot     |
                             +------------------+

注意：这只是一个示例类图，可能还有其他的类和关系未在代码中给出。