可以“测量”django模型实例的嵌套程度吗

import sys
from django.db import models

class MyModel(models.Model):
    name = models.CharField(max_length=100)
    nested_model = models.ForeignKey('self', on_delete=models.CASCADE, null=True, blank=True)

# 创建一个嵌套了两层的模型实例
nested_instance = MyModel(name='Nested Instance')
nested_instance.save()
root_instance = MyModel(name='Root Instance', nested_model=nested_instance)
root_instance.save()

# 测量模型实例的嵌套程度
def measure_nested_depth(instance):
    depth = 0
    while instance:
        depth += 1
        instance = instance.nested_model
    return depth

nested_depth = measure_nested_depth(root_instance)
memory_size = sys.getsizeof(root_instance)

print(f"嵌套深度: {nested_depth}")
print(f"内存大小: {memory_size} bytes")