Giving an example...
I set 'c.category = None' in my controller to indicate to the template
that no category is being browsed at present.
Then in my template I have a line like this:
{{ url(controller='browse', action='article_browser',
section='popular', category_slug=c.category.slug, page=pages.next) }}
Jinja2 trys to access 'c.category.slug', it can't, because
'c.category' is set to None, and so it returns a class of the type
'jinja2.runtime.Undefined'
What I am suggesting is that returning the Undefined class is
pointless. It should instead just return None. What good is it to me
to have an Undefined class? What can I do with it? Why would I need
it?
You might suggest that I use an if statement. That is not feasable.
The code I have shown you is just an example of the problem. My code
is far more complex, and makes many calls to url() with reference to
'c.category.category_slug', and putting if statements over the place
would just mess things up.
Hope that makes more sense.
On Jul 25, 5:13 pm, "The Devil's Programmer"
<[email protected]> wrote:
> I'm using pylons, and when I access a value from the context which has
> not been defined, instead of returning None like you'd expect it to,
> it returns a class of type 'jinja2.runtime.Undefined'
>
> It's screwing up my url generation, because when I try to generate a
> url with category=c.category, and category is set to None (ie..user
> not currently browsing a specific category), it tries to match a url
> with category=Undefined.
>
> I see no reason for this behavior. When would that Undefined class
> ever be useful to the template?
>
> And yes,
> config['pylons.strict_c'] = True
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