On Fri, 2006-10-27 at 17:10 +0000, [EMAIL PROTECTED] wrote:
> I've got basically the same problem (trying to have rankings available
> different places). I've been looking at Generic Relations and
> Content_type, and think I get it on a conceptual level, but there's
> something I'm missing.
>
> I'm passing the content_type (and an id) in the URL so the view will
> know what I'm dealing with:
>
> (r'^vote/(?P<content_type>[-\w]+)/(?P<obj_id>\d+)/(?P<vote>up|down)/$',
> 'gretschpages.karma.views.vote'),
>
> So then in the view I need to get whatever object is being voted on,
> right? I'm trying:
> obj = ContentType.objects.get_for_model(content_type)
>
> but that throws 'str' object has no attribute '_meta'
That's correct behaviour for get_for_model(). It takes a model -- a
Python class -- not a content_type value (which is an integer). It maps
your Python models to the appropriate ContentType instance. You want to
go the other way: given a content_type id, get the ContentType model and
then map that back to the referenced model (see below).
> So how do I get that object?
You have the integer which is the primary key value for the ContentType
instance. So
ct = ContentType.objects.get(pk=content_type)
will give you a ContentType object back. Now you can use
ct.model_class() to get the model it is related to, or even
ct.get_object_for_this_type(pk=obj_id)
to get the particular instance it relates to. This latter method is a
useful shortcut method which gets the appropriate model type (using
model_class()) and then applies the filter to that.
Regards,
Malcolm
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