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如何向django admin(显示在模型仪表板右侧的过滤器)添加自定义过滤器？我知道很容易包含一个基于该模型字段的过滤器,但是这样的"计算"字段呢:

class NewsItem(models.Model):
    headline = models.CharField(max_length=4096, blank=False)
    byline_1 = models.CharField(max_length=4096, blank=True)
    dateline = models.DateTimeField(help_text=_("date/time that appears on article"))
    body_copy = models.TextField(blank=False)

    when_to_publish = models.DateTimeField(verbose_name="When to publish",  blank=True, null=True)

    # HOW CAN I HAVE "is_live" as part of the admin filter?  It's a calculated state!!
    def is_live(self):
        if self.when_to_publish is not None:
            if ( self.when_to_publish < datetime.now() ):
                return """ <img alt="True" src="/media/img/admin/icon-yes.gif"/> """
        else:
            return """ <img alt="False" src="/media/img/admin/icon-no.gif"/> """      

    is_live.allow_tags = True

class NewsItemAdmin(admin.ModelAdmin):
    form = NewsItemAdminForm
    list_display …