[stringtemplate-interest] Multimethods

[Roman Odaisky]

Hi,

> your template could be
>
> blog_post(m,d,y) ::= "/y/m/d&sessionid=<session.ID>"
> or whatever the field of the session is. would that work?

That would work. But that would cause unnecessary duplication.

Django has a thing called URLconf[1] which allows one to bind URLs to 
functions by means of regular expressions. Moreover, it allows one to 
determine a URL that would cause a given function to get called with given 
arguments.

For example, if a URLconf entry looks like this:

(r"^/(?P<year>\d+)/(?P<month>\d+)/(?P<day>\d+)$", posts_by_date)

then Django would call posts_by_date(request, year=2008, month=11, day=14). 
And when one calls reverse(posts_by_date, year=2008, month=11, day=14), one 
gets "/2008/11/14". So one line in a configuration file works both ways. If I 
were to create a template like the one you suggested above, it would 
duplicate the information that is already known to the application.

I need to have an option to use that system. Adding a get_absolute_url method 
to objects works as long as the URL depends only on one object, but recently 
I’ve encountered URLs that need more than one. At the moment I’m using hacks 
like $o1.url_for_o2.(o2.id)$ where get_url_for_o2() returns an object with 
operator [] overloaded.

Do you have anything against explicit adding of templates that call functions 
like I proposed in the first message?

References:
[1] http://docs.djangoproject.com/en/dev/intro/tutorial03/#design-your-urls

-- 
WBR
Roman.
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