On Thu, 2008-02-21 at 20:47 -0500, Nick Fishman wrote:
> Hey everyone. I've run into an issue with dictionaries in templates, and
> I'm kind of stuck. I'm trying to track incidents by username and month.
> Here's what I have passed into a template:
>
> months = ['Mar', 'Feb', 'Aug', 'Sep', 'Apr', 'Jan', 'May', 'Nov', 'Dec',
> 'Oct']
> mapping = {'username': u'jdoe5', 'incidents': {'Mar': 0L, 'Feb': 28L,
> 'Aug': 0L, 'Sep': 0L, 'Apr': 0L, 'Jan': 0L, 'May': 0L, 'Nov': 0L, 'Dec':
> 0L, 'Oct': 0L}}
>
> Here's where the problem occurs:
>
> {% for month in month %}
> {{ mapping.incidents.month }}
> {% endfor %}
>
> I'm trying to make Django call mapping['incidents']['Mar'],
> mapping['incidents']['Jul'], and so on for each month in the months
> list. But instead, Django seems to be doing
> mapping['incidents']['month'] each time.
>
> Is there any way to resolve the dynamic "month" variable inside the
> mapping.incidents.month call? Something almost like {{
> mapping.incidents.param="month" }}?
What you're wanting to do here (indirect variable lookup) isn't possible
in the template system out of the box. The reason is simplicity (or,
rather, anti-complexity): there's no way to really tell the difference
between "month" as a direct attribute and "month" as a variable to use
to get the value of the attribute to use (the indirect version). We'd
have to add yet more markup and it's not really worth it.
If I was doing this, I'd probably write a filter so you could write
{{ mapping.incidents|lookup:month }}
I wouldn't be too surprised if something like that already existed at
djangosnippets.org, but, if not, it should be only a couple of lines to
write one.
Regards,
Malcolm
--
The early bird may get the worm, but the second mouse gets the cheese.
http://www.pointy-stick.com/blog/
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