[Catalyst] XPath, DOM problem

[Herr Verdieck Götz]

Hi Tom,

you are right, I should stick to the MVC pattern.

But I think it is curious that XML.Simple finds the path and XPath/DOM  
not.

Götz


Am 08.07.2008 um 11:37 schrieb Tomas Doran:

>
> On 8 Jul 2008, at 09:00, Herr Verdieck Götz wrote:
>
>> Hi,
>>
>> 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  
> your templates.
>
> Cheers
> Tom
>
>
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