订购Django引起的无限循环

Question

当我尝试从模型中删除记录时出现此错误：

  

订购导致的无限循环

class Empresa(MPTTModel):
    nombre = models.CharField(max_length=35, unique=True, db_index=True)
    parent = TreeForeignKey('Empresa', blank=True, null=True, related_name='children')
    nivel = models.PositiveIntegerField(default=1)
    class MPTTMeta:
        order_insertion_by = ['nivel']
    class Meta:
        ordering = ['parent__id']

提前致谢

Answer 1

您是否尝试过使用self？

 parent = TreeForeignKey('self', blank=True, null=True, related_name='children'

并删除

`ordering = ['parent__id']`