如何在Django中为同一个模型提供两个外键？

from django.db import models

class ModelA(models.Model):
    name = models.CharField(max_length=100)

class ModelB(models.Model):
    model_a_1 = models.ForeignKey(ModelA, on_delete=models.CASCADE, related_name='model_b_1')
    model_a_2 = models.ForeignKey(ModelA, on_delete=models.CASCADE, related_name='model_b_2')

model_a_instance = ModelA.objects.get(id=1)
model_b_instance = ModelB.objects.get(id=1)

# 获取关联的ModelA对象
related_model_a_1 = model_b_instance.model_a_1
related_model_a_2 = model_b_instance.model_a_2

# 通过related_name访问ModelB对象
model_a_instance.model_b_1.all() # 获取所有关联的ModelB对象，其中model_a_1字段指向当前ModelA对象
model_a_instance.model_b_2.all() # 获取所有关联的ModelB对象，其中model_a_2字段指向当前ModelA对象