When defining a route, there are several hooks available to you to
configure custom behaviors.
1) The route pattern.
2) Route predicates.
3) Route factory.
You basically touched on all of these in your examples. It's usually
advantageous to have a single route, so let's ignore the pattern
options. Similarly you can do custom code in the predicates but that's
shoe-horning side-effects into the predicates which is not a good
match.
I'd recommend using a factory specific to that route. You can do cool
things in that factory like inspect/modify the matchdict. Views
attached to that route can then still expect a particular format for
the matchdict and even define *view* predicates that dispatch to
different views based on the matchdict.
On the flip side you can use a pregenerator on that route to make
generation easy. For example, request.route_url('by', userid=50) and
request.route_url('by', username='bob') would both invoke the
pregenerator that inspects the kwargs and converts
kwargs['identifier'] = '-' + kwargs.pop(userid) versus
kwargs['identifier'] = kwargs.pop('username').
Anyway I think you already know how to solve your problem so my ideas
may just reinforce what you were already thinking.
- Michael
On Wed, Oct 15, 2014 at 1:07 PM, Jonathan Vanasco <jvana...@gmail.com> wrote:
> i'm using url dispatch , and I have some routes that begin with this:
>
> "/by/{username:\w+}"
>
> i now need to support 'id' based urls as well. e.g.
>
> "/by/{userid:\-\d+}"
>
> the regexes are actually more complicated, and defined elsewhere.
>
> there is an approach i think I'd like to pursue, and I think a custom route
> factory might be the solution -- but i'm not sure. hoping someone can point
> me in the right direction (or offer a better idea).
>
> 1. I'd like to reference an externally defined regex pattern, instead of
> redefining it (multiple times) in my routes.py. basically, i'd like to tie
> in the validation + routing regexes to avoid potential errors in
> development.
>
> 2. i'd like to define a single route, with a single 'identifier' in the
> route declaration -- and to then process it to augment or redefine the
> matchdict to contain the specific matched identifier.
>
> e.g.
>
> route: "/by/{identifier}"
> url a : /by/-123 => matchdict = {'identifier': '-123', 'userid':
> '-123'}
> url a : /by/example=> matchdict = {'identifier': 'example',
> 'username': 'example}
>
>
>
>
>
>
>
>
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