Displaying Categories / Subcategories (Tango with Django Example)

[Michael Smith]

I'm following the latest Tango book and was experimenting with different ways of looping through categories and subcategories to create a list.  I have a 'Category' and 'Page' model, where Page has a foreign key to Category's ID.  To display a list with sub-bullets I simply passed all categories and pages to a template and then looped through Page:

<ul>

  {% if cats %}

    {% for c in cats %}

      {% if c == act_cat %}

      <strong><li><a href="{% url 'show_category' c.slug %}">{{ c.name }}</a></li>

      </strong>

      {% else %}

      <li><a href="{% url 'show_category' c.slug %}">{{ c.name }}</a>

      {% endif %}

        {% for p in pages %}

          {% if p.category_id == c.pk %}

            <ul><li><a href="{{ p.url }} ">{{ p.title }}</li></ul>

          {% endif %}

        {% endfor %}

    {% endfor %}

  {% else %}

    <li><strong>There are no categories present.</strong></li>

  {% endif %}

</ul>

Is this considered the best way to do such a thing?

[jorr...@gmail.com]

You can look into the {% regroup %} template tag. It will do what you are trying to do more elegantly.

[carlos]

{% regroup %} is elegantly or more optimized???

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att.

Carlos Rocha

[jorr...@gmail.com]

Both, actually. The OP is looping through his cats and pages querysets multiple times unnecessarily. That can get very inefficient as those database tables get bigger.

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att.

Carlos Rocha