템플릿 쿼리조회 옵션불가 해결

custom_tags.py

#  템플릿 쿼리조회 옵션불가 해결

@register.filter
def in_category(things, category):
    return things.filter(category=category)

# 템플릿에
{% for category in categories %}
  {% for thing in things|in_category:category %}
    {{ thing }
  {% endfor %}
{% endfor %}