如何使用Django-Haystack预先选择facets (即在页面加载时选中复选框)？

from haystack.query import SearchQuerySet

def search_view(request):
    sqs = SearchQuerySet().all()
    # 其他搜索过滤操作...
    return render(request, 'search_results.html', {'results': sqs})

{% load haystack %}

<h1>Search Results</h1>

<ul>
    {% for result in results %}
        <li>{{ result.object }}</li>
    {% endfor %}
</ul>

<h2>Facets</h2>

<ul>
    {% for field in results.facet_counts.fields %}
        <li>{{ field.0 }}:</li>
        <ul>
            {% for value in field.1 %}
                <li>
                    <input type="checkbox" name="facets" value="{{ value.0 }}" {% if value.1 %}checked{% endif %}>
                    {{ value.0 }} ({{ value.1 }})
                </li>
            {% endfor %}
        </ul>
    {% endfor %}
</ul>