On Fri, Jul 03, 2009 at 09:04:37AM -0700, Rajesh D wrote:
>
> On Jul 3, 9:17 am, Nikola Pavlović <n...@datasnok.org> wrote:
> > Hello people,
> >
> > I'm writing my first Django application and would like to know what is
> > considered more efficient: getting values of models' attributes in views
> > or directly in templates?
> >
> > More precicely, say we have a Person model with name and id attributes,
> > and these need to be shown on a page.
> >
> > Is it better for a view to "prepare" a context like this:
> >
> > # views.py
> > # ...
> >
> > persons = []
> >
> > for person in Person.objects.all():
> > persons.append({'id': person.id, 'name': person.name})
> >
> > return render_to_response('some_template.html', persons)
> >
> > # some_template.html
> >
> > {% for p in persons %}
> > Id: {{ p.id }}; Name: {{ p.name }}
> > {% endfor %}
> >
> > or just pass a QuerySet in a context like this:
> > # views.py
> > # ...
> >
> > persons = Person.objects.all()
> > return render_to_response('some_template.html', persons)
> >
> > and then let the template access attribute values directly?
> >
> > Does it make a difference in terms of performance?
>
> The second method avoids an extra loop and also keeps your code leaner
> (less code == lesser chances of bugs). It's also the more commonly
> used method. And if you are displaying just a handful of persons per
> page, the performance differences should be negligible either way.
Great, that was just what I wanted to know -- a 'Django best practices'
kind of question.
After a couple of hours of playing with this the other day, I came to
the same ("obvious") conclusion (much simpler code), but I was just
concerned if there was some significant overhead to accesing attributes
in the rendering phase.
Thanks!
--
Two can Live as Cheaply as One for Half as Long.
-- Howard Kandel
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