On Saturday 25 February 2006 16:58, ChaosKCW wrote:
> Please can someone help. I am following Tutorial4 for generic views,
> plus adapting it to the magic removal instructions on the wiki page.
> As far as I can tell i followed the instructions exactly, But I get
> an error stating that 'model' is not a valid paremeter to the view.
The tutorial is now badly out of date for magic-removal. Instead of
taking a model and app_label, they take a 'queryset' argument, which
should be a QuerySet object. QuerySet objects are what you implicitly
use in magic removal to do all lookups on the database. For instance,
Poll.objects.all() is a QuerySet. Because QuerySets are 'lazy', you
can create them in your URL conf and the data won't be retrieved at
that point, but each time the generic view is actually called. In my
urls.py I have something like this:
(r'^sites/$', 'list_detail.object_list',
{'queryset': Site.objects.all(),
'template_name': 'cciw/sites/index'
}
),
(r'^sites/(?P<slug>.*)/$', 'list_detail.object_detail',
{'queryset': Site.objects.all(),
'slug_field': 'slug_name',
'template_name': 'cciw/sites/detail'
}
),
...
Note how I use all the 'Site' objects in the both cases, but don't worry
-- only in the first case does it actually result in all the objects
being retrieved from the db, in the second case the view derives a new
QuerySet, based on the one passed in, that only gets a single object.
I personally think the new syntax is much nicer - no need for
'extra_lookup_args' etc. If you wanted to have a different ordering
plus extra filtering, you could change Site.objects.all() to e.g.
Site.objects.filter(visible=True).order_by('name').
One thing - I'm not sure all the generic views have been updated yet. I
do know the above examples work.
Luke
--
Parenthetical remarks (however relevant) are unnecessary
Luke Plant || L.Plant.98 (at) cantab.net || http://lukeplant.me.uk/
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