Home

Cookin’ with traverse_subpath

MatthewWilkes's picture
Sun, 10/21/2007 - 11:41 — MatthewWilkes

I’ve heard a few people mention this, so I thought I’d post this recipe. We’re using a simpler version in Vice to prettify some URLs, but it was so easily generalised I knocked an example together.
The idea is that the traverse_subpath variable from Script (Python) was a nice recipe for getting information from URLs. You might have a URL http://127.0.0.1:8080/test/traverse_subpath/a/v/121/a/a/a/ 1213 and want the list [“a”, “v” “121”, “a”, “a”, “a”, “1213”].
It turns out that as z3 views are based on their own traversal mechanism, it’s really easy to override to get something to emulate this behaviour.
So, set up your view as you usually would, but note the subtle differences from the boilerplate:
traversesubpath.py

from Products.Five.browser.pagetemplatefile
import ViewPageTemplateFile
from zope.publisher.browser import BrowserPage



class subpath(BrowserPage):



def init(self, context, request):
     self.context = context  # Use Martin's aqmagic
     self.request = request
     self.path = []



def publishTraverse(self, request, name):
     self._path.append(name)
     return self



@property
 def traversesubpath(self):
     return self.path



call = ViewPageTemplateFile(’traversesubpath.pt’)

traversesubpath.pt

<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"
    xmlns:tal="http://xml.zope.org/namespaces/tal"
    xmlns:metal="http://xml.zope.org/namespaces/metal"
    xmlns:i18n="http://xml.zope.org/namespaces/i18n"
    lang="en"
    i18n:domain="plone">



<ul>
  <li
 tal:repeat="pathitem view/traverse_subpath"
 tal:content="pathitem" />
  </ul>



</html>

With the URL I gave above, I get the following page rendered:

  • a
  • v
  • 121
  • a
  • a
  • a
  • 1213

It’s that simple.

Organization: Plone Foundation Original: Source