django orm 通过related_name反向查询的方法

class level(models.Model):
 l_name = models.CharField(max_length=50,verbose_name=\"等级名称\")
 def __str__(self):
  return self.l_name
 
 
class userinfo(models.Model):
 u_name = models.CharField(max_length=50,verbose_name=\"用户名称\")
 u_level = models.ForeignKey(level,related_name=\"lev\")
 
 def __str__(self):
  return self.u_name

userinfo. .get(pk=1).u_level

level. s.get(pk=1).lev.all()