class PermissionsMixin(models.Model):
    ...
    groups = models.ManyToManyField(
        Group,verbose_name=_('groups'),blank=True,help_text=_(
            'The groups this user belongs to. A user will get all permissions '
            'granted to each of their groups.'
        ),related_name="user_set",related_query_name="user",)
    ...

class AbstractUser(AbstractBaseUser,PermissionsMixin):
  ...
  ...

class MyUser(AbstractUser):

    //i want groups rename to roles

    class Meta:
        db_table = 'user'

我看到迁移具有RenameField，如何使用？代码非常清楚，为什么系统总是提示输入更多详细信息，白痴系统。