如何在 ModelAdmin list_display 中 return __str__(self)

How to return __str__(self) in ModelAdmin list_display

我有以下型号:

class Administrator(models.Model):
    // code

    def __str__(self):
        title = 'Administrator ' + str(self.pk)
        return title

此 return 的 objects 标题为 Administrator 1Administrator 2

如何 return list_display 中的 title 获得 ModelAdmin?:

class AdministratorAdmin(ModelAdmin):
    model = Administrator
    list_display = ('pk', 'id', 'title???')

我觉得应该是:

class AdministratorAdmin(ModelAdmin):
    model = Administrator
    list_display = ('pk', 'id', '__str__')