On Mon, Mar 11, 2013 at 2:21 PM, Tom Evans <[email protected]> wrote: > On Mon, Mar 11, 2013 at 2:00 PM, jayhalleaux <[email protected]> wrote: >>>> Any ideas on question 1? how to use named urls in settings.py? >> > > The problem with having named URLs in settings.py (also some other > places, models.py for instance) is that at this point, the URL > resolving architecture has not yet been completed. > > There is a simple solution - you do not actually want the URL in > settings.py at the time settings.py is parsed. When you actually want > the URL, everything is properly set up. Therefore, you can use a > simply lazy evaluation of your reverse call: > > from django.utils.functional import lazy > from django.core.urlresolvers import reverse > > lazy_reverse = lazy(reverse, str) > > FOO_URL = lazy_reverse('mysite:my-named-url') > > The downside of lazy is that this url will get re-generated each time > you access FOO_URL. There is a bit of magic for that too, you can > memoize the result: > > from django.utils.functional import lazy, memoize > from django.core.urlresolvers import reverse > > _reverse_memo_cache = { } > lazy_memoized_reverse = memoize(lazy(reverse, str), _reverse_memo_cache, 1) > > FOO_URL = lazy_memoized_reverse('mysite:my-named-url') > > Cheers > > Tom
Just noticed, I have my memoize and lazy the wrong way around, so it has the wrong effect! The correct way should be: lazy_memoized_reverse = lazy(memoize(reverse, c2, 1), str) IE, memoize the return value of reverse, and lazy evaluate it, not memoize the lazily evaluated reverse function! How embarrassing :) Cheers Tom -- You received this message because you are subscribed to the Google Groups "Django users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/django-users?hl=en. For more options, visit https://groups.google.com/groups/opt_out.
