[Catalyst] XPath, DOM problem
bobtfish at bobtfish.net
Tue Jul 8 10:37:27 BST 2008
On 8 Jul 2008, at 09:00, Herr Verdieck Götz wrote:
> I try to generate a site content menu from a xml file.
> In my TT file I have the following syntax:
> # USE prod_tree = XML.Simple('config/xml/hele_de_tree.xml'); # OK
> this works
> USE xpath = XML.XPath('config/xml/hele_de_tree.xml'); # ERROR
> #USE dom = XML.DOM;
> #prod_tree = dom.parse('config/xml/sitemap.xml'); # ERROR
> The XML.Simple version is ok, but
> when I try to use XPath - or DOM- I get the message:
> Errot message:
> Couldn't render template "plugin error - Cannot open file 'config/
> xml/hele_de_tree.xml' at /Library/Perl/5.8.8/XML/XPath.pm line 53.
> I use Catalyst 5.7014 and Template-Toolkit-2.19.
> I also tested XPath with a small script without problems. So the
> combination with TT or Catalyst causes the error.
I'd guess it's not finding the correct path..
You probably want to say something like:
USE xpath = XML.XPath(c.path_to('config', 'xml', 'hele_de_tree.xml'));
so that you are not relying on the PWD being what you expect.
However, there is a good argument that you shouldn't be doing this in
a template - this is data/domain logic, and therefore separation of
concerns says that this should be in the Model.
I'd create a model which creates the appropriate data structures for
you, and a controller which defines the file path, feeds it to the
model, and then pushes the returned data structure/objects into the
stash, allowing the templates to them simply iterate over them.
This buys you a lot of future proofing, as if you start wanting to
pre-process your XML in some way before passing it to the template,
you can trivially do so, without having to change any of the code in
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