基于外键的Django组合主键的最佳解决方案

class ModelA(models.Model):
    # 其他字段
    b_models = models.ManyToManyField(ModelB)

class ModelB(models.Model):
    # 其他字段
    a_models = models.ManyToManyField(ModelA)

model_a_instance.b_models.all()

class ModelA(models.Model):
    # 其他字段
    b_models = models.ManyToManyField(ModelB, through='IntermediateModel')

class IntermediateModel(models.Model):
    model_a = models.ForeignKey(ModelA, on_delete=models.CASCADE)
    model_b = models.ForeignKey(ModelB, on_delete=models.CASCADE)
    extra_field = models.CharField(max_length=100)