Django管理列表过滤器-下拉小部件

我可以改变 list_filter 要下拉列表的相关对象。问题是当我想过滤相关对象的相关对象时:

class Match(Model):
    team = models.ForeignKey('Team'...)
    away_team = ... (doesn't matter)

class Team(Model):
    country = models.ForeignKey('Country'...)

Match 对象依据 Team ,我知道:

list_filter = ['team__country']

dropdown 我用这个过滤器 https://github.com/mrts/django-admin-list-filter-dropdown :

 list_filter[('team',RelatedDropdownFilter)]

当我想过滤的时候 对象依据 Country 他们的 团队 :

list\u filter=['team\u country']

list_filter = [('team__country',RelatedDropdownFilter)]

看起来和没有一样 RelatedDropdownFilter

相关下拉滤波器

class RelatedDropdownFilter(RelatedFieldListFilter):
    template = 'django_admin_listfilter_dropdown/dropdown_filter.html'

模板

{% load i18n %}
<script type="text/javascript">var go_from_select = function(opt) { window.location = window.location.pathname + opt };</script>
<h3>{% blocktrans with title as filter_title %} By {{ filter_title }} {% endblocktrans %}</h3>
<ul class="admin-filter-{{ title|cut:' ' }}">
{% if choices|slice:"4:" %}
    <li>
    <select style="width: 95%;"
        onchange="go_from_select(this.options[this.selectedIndex].value)">
    {% for choice in choices %}
        <option{% if choice.selected %} selected="selected"{% endif %}
         value="{{ choice.query_string|iriencode }}">{{ choice.display }}</option>
    {% endfor %}
    </select>
    </li>
{% else %}

    {% for choice in choices %}
            <li{% if choice.selected %} class="selected"{% endif %}>
            <a href="{{ choice.query_string|iriencode }}">{{ choice.display }}</a></li>
    {% endfor %}

{% endif %}
</ul>

你知道我该怎么做吗?