> I'm making a list of objects, and only including some of them in the output:
>
> {% for thing in mylist %}
> {% if thing.test %}
> {{thing}}
> {% endif %}
> {% endfor %}
>
> Now if I want to comma-separate the list, how do I do it? The natural
> thing to my mind is an "iffirst" tag:
>
> {% for thing in mylist %}
> {% if thing.test %}
> {% iffirst %}Things: {% else %}, {% endiffirst %}
> {{thing}}
> {% endif %}
> {% endfor %}
>
> {% iffirst %} is true the first time it is evaluated in each loop.
> Because of the "if thing.test", it could be evaluated first on the third
> time through the loop, for example. That's why forloop.first isn't
> sufficient.
>
> I've tried creating such a tag, but can't find the contextual
> information I need to know when the for loop has been restarted.
>
> (Also: the whitespace will be messed up even if I do have this tag: the
> comma will have space before it).
>
> So, two questions: 1) How would I create a tag like this, and 2) is
> there some simpler way to achieve my purpose?
>
the for loop has a forloop.first, see:
http://www.djangoproject.com/documentation/templates/#for
Creating your own tags is covered in
http://www.djangoproject.com/documentation/templates_python/
I would look at the join filter though.
http://www.djangoproject.com/documentation/templates/#join
Michael Trier
blog.michaeltrier.com
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