in SQL, or Django ORM, what's the conventional way to have an ordered one-to-many?

Question

Say I wanted to have a project, and one-to-many with to-do items, and wanted to re-order the to-do items arbitrarily?

In the past, I\'ve added a numbered order field, a

Answer 1

I hate this problem ... and I run into it all the time.

For my most recent Django site we had a Newsletter which contained N Articles and, of course, order was important. I assigned the default order as ascending Article.id, but this failed if Articles were entered in something other than "correct" order.

On the Newsletter change_form.html page I added a little bit of jQuery magic using the Interface plugin (http://interface.eyecon.ro/). I show the titles of the associated Articles and the user can drag them around as they like. There is an onChange handler that recomputes the Article.id's in article_order field.

Enjoy,
Peter

For app=content, model=Newsletter, the following is in templates/admin/content/newslettter/change_form.html

{% extends 'admin/change_form.html' %}

{% block form_top %}{% endblock %}
{% block extrahead %}{{ block.super }}



{% endblock %}

{% block after_related_objects %}
{% if original.articles %}


Associated Articles

{% for art in original.articles %}
    
{{art.title}}

{% endfor %}

{% endif %}
{% endblock %}