Selecting a render method from a view using the URL

alberto · September 21, 2016, 9:47pm

Suppose I have a "test" view, registered for "*" in configure.zcml. The view has a TestView class.

I have two templates, alpha.pt and beta.pt. I want the view to be able to select the template based on the request URL, like so:

http://localhost:8080/Plone/test/alpha should call the test view, which would render the alpha.pt template;
http://localhost:8080/Plone/test/beta should call the test view, which would render the beta.pt template

My question is about getting the last part of the URL as a parameter to the call method of the view. How can I do that?

Thanks.

espenmn · September 21, 2016, 10:22pm

Why not just register two views with the same class but with different templates ?

Or maybe you could define which template to use in the view.py and call it like:
http://site/test?view=alpha

jensens · September 21, 2016, 10:27pm

I wrote this blog post addressing exactly what you need first: https://bluedynamics.com/blog/jens/plone-traverse_subpath-for-browserviews-view-some-more-path

After you got the name its easy to conditionally render one or the other template.

petri · September 23, 2016, 6:29am

Doesn't that just build another copy of what's already in request['TraversalRequestNameStack']?

jensens · September 23, 2016, 6:45am

In fact it more or less does. But at every step one may not return self, but a different object - even one out of ZODB. And instead of building a list one may want to build a dict or what you like out of it as well. And it does this at traversal time. So many additional options.

gyst · September 23, 2016, 7:06am

Here's another working example, that given a url /@@stream/tag/foo extracts the "foo" tag argument:

github.com

ploneintranet/ploneintranet/blob/f12b92b15f092ebb020afc38741bf882737470f8/src/ploneintranet/core/browser/stream.py#L36


    self.context = context
    self.request = request
    self.tag = ''
    # default to full stream
    self.explore = True


def update(self):
    '''Mute plone.app.z3cform.kss.validation AttributeError'''
    pass


def publishTraverse(self, request, name):
    ''' used for traversal via publisher, i.e. when using as a url '''
    if name == 'tag':
        stack = request.get('TraversalRequestNameStack')
        try:
            self.tag = stack.pop()
        except IndexError:
            # don't traceback on missing tag spec
            self.tag = None
    elif name == 'network':
        # @@stream/network enables 'following' filter