Michael Brickenstein schrieb:
> Implementing __nonzero__ should eliminate the trap.
You're inspiring me to this really devilish monkey patch in TG:
from tg import request
from repoze.what.predicates import Predicate
Predicate.__nonzero__ = lambda self: self.is_met(request.environ)
With this hack, predicates can be used inside templates like this:
<p py:if="has_permission('edit-posts')">
Congrats! You can edit blog posts.
</p>
Unfortunately, they lose the ability to work in a require decorator,
because the decorator uses repoze.what.authorize.check_authorization
which uses "predicate and predicate.check_authorization(environ)" as an
internal check. This causes our __nonzero__ method to be called. But
after changing that to "predicate is not None and ...", it works:
Check predicate instances then get a dual use inside TG, both for if
statements and for @require().
Might a bit too magical and hackish, though.
-- Christoph
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