DRF(Django-Rest-FrameWork)非主外键自关联

class SysPermission(models.Model):
    id = models.CharField(db_column='Id', primary_key=True, max_length=50)  # Field name made lowercase.
    parentid = models.CharField(db_column='ParentId', max_length=50, blank=True, null=True)  # Field name made lowercase.
    layer = models.IntegerField(db_column='Layer', blank=True, null=True)  # Field name made lowercase.
    encode = models.CharField(db_column='EnCode', max_length=50, blank=True, null=True)  # Field name made lowercase.
    name = models.CharField(db_column='Name', max_length=50, blank=True, null=True)  # Field name made lowercase.
    jsevent = models.CharField(db_column='JsEvent', max_length=50, blank=True, null=True)  # Field name made lowercase.
    icon = models.CharField(db_column='Icon', max_length=50, blank=True, null=True)  # Field name made lowercase.
    url = models.CharField(db_column='Url', max_length=255, blank=True, null=True)  # Field name made lowercase.
    remark = models.CharField(db_column='Remark', max_length=255, blank=True, null=True)  # Field name made lowercase.
    type = models.IntegerField(db_column='Type', blank=True, null=True)  # Field name made lowercase.
    sortcode = models.IntegerField(db_column='SortCode', blank=True, null=True)  # Field name made lowercase.
    ispublic = models.IntegerField(db_column='IsPublic', blank=True, null=True)  # Field name made lowercase.
    isenable = models.IntegerField(db_column='IsEnable', blank=True, null=True)  # Field name made lowercase.
    isedit = models.IntegerField(db_column='IsEdit', blank=True, null=True)  # Field name made lowercase.
    deletemark = models.IntegerField(db_column='DeleteMark', blank=True, null=True)  # Field name made lowercase.
    createuser = models.CharField(db_column='CreateUser', max_length=50, blank=True, null=True)  # Field name made lowercase.
    createtime = models.DateTimeField(db_column=