This is the final code which works in case it helps anyone else.
Thanks again.
In the template:
{% page_links category %}
In templatetags file
@register.tag(name="page_links")
def get_page_links(parser,token):
tag_name, category = token.contents.split()
return PageLink(category)
class PageLink(template.Node):
def __init__(self, category):
self.category = template.Variable(category)
def render(self, context):
cat = self.category.resolve(context)
if cat=='business':
pages=BusinessPage.objects.filter
(is_live=True).select_related().order_by('order')
elif cat=='community':
pages=CommunityPage.objects.filter
(is_live=True).select_related().order_by('order')
elif cat=='tourism':
pages=TourismPage.objects.filter
(is_live=True).select_related().order_by('order')
else:
pages = False
context['pages'] = pages
return ''
On Jan 29, 3:22 pm, phoebebright <phoebebright...@gmail.com> wrote:
> You understood perfectly. It was just another case of my not
> understanding the documentation. Your explanation makes perfect
> sense.
>
> Many thanks.
>
> On Jan 27, 6:45 pm, Eric Abrahamsen <gir...@gmail.com> wrote:
>
> > On Jan 28, 2009, at 1:52 AM, phoebebright wrote:
>
> > > I have duplicated as best I can the processing for handling variables
> > > incustomtemplatetagsmentioned in an earlier post but it's not
> > > working for me as I need the value of the variable before I parse it.
> > > Is there another way of making the variable available?
>
> > > The tag is being called from the tempalte with:
>
> > > {% page_links "category" %}
>
> > > Where category is being passed into thetemplatefrom a view. (also
> > > tried "{{category}}" and {{category}} and category)
>
> > > I want to use the value of category to determine which list of pages
> > > to return.
>
> > > I KNOW THIS DOESN"T WORK:
>
> > > @register.tag(name="page_links")
> > > def get_page_links(parser,token):
> > > tag_name, cat = token.contents.split()
> > > return PageLink(cat[1:-1])
>
> > > class PageLink(template.Node):
>
> > > def __init__(self, cat):
>
> > > cat=template.Variable(cat)
> > > print cat <--------------------- outputs category
> > > if cat=='business':
> > > pages=BusinessPage.objects.filter
> > > (is_live=True).select_related().order_by('order')
> > > elif cat=='community':
> > > pages=CommunityPage.objects.filter
> > > (is_live=True).select_related().order_by('order')
> > > elif cat=='tourism':
> > > pages=TourismPage.objects.filter
> > > (is_live=True).select_related().order_by('order')
>
> > > else:
> > > pages = False
>
> > > self.pages = pages
>
> > > def render(self, context):
> > > context['pages'] = self.pages
>
> > > return ''
>
> > I might be missing something you're trying to do here, but the usual
> > method for resolving a variable in acustomtemplatetag is to first
> > put it into the tag (without quotes) like so:
> > {% page_links category %}
>
> > Then attach that to your PageLink node in its __init__ method as a
> > Variable:
> > self.cat =template.Variable(cat)
>
> > Then inside the render method first resolve it:
> > category = self.cat.resolve(context)
>
> > and then check the value of category against your various models. That
> > all has to be done in render, not __init__, because context is only
> > available in render.
>
> > This is all straight out of the
> > docs:http://docs.djangoproject.com/en/dev/howto/custom-template-tags/#pass...
>
> > Apologies in advance if I've misunderstood what you're trying to do...
>
> > Eric
>
> > > This code works fine as long as I call it like this:
>
> > > {% page_links "business" %}
>
> > > @register.tag(name="page_links")
> > > def get_page_links(parser,token):
>
> > > tag_name, cat = token.contents.split()
> > > cat = cat[1:-1]
>
> > > if cat=='business':
> > > pages=BusinessPage.objects.filter
> > > (is_live=True).select_related().order_by('order')
> > > elif cat=='community':
> > > pages=CommunityPage.objects.filter
> > > (is_live=True).select_related().order_by('order')
> > > elif cat=='tourism':
> > > pages=TourismPage.objects.filter
> > > (is_live=True).select_related().order_by('order')
> > > else:
> > > pages = False
>
> > > return PageLink(pages)
>
> > > class PageLink(template.Node):
>
> > > def __init__(self, pages):
> > > self.pages = pages
>
> > > def render(self, context):
> > > context['pages'] = self.pages
>
> > > return ''
>
>
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