Hi, Christoph.
On Friday January 30, 2009 13:52:02 Christoph Zwerschke wrote:
> I think that function would be also useful as a standard template
> variable (like "auth_stack_enabled" or "identity"). Of course, you can
> always evaluate in the controller and pass the boolean, or pass the
> function, but why not provide something to make simple things simple?
I would be -1 on making it available there because of the same issue I
mentioned in my previous email, I think defining/evaluating predicates in the
template is anti-MVC.
I think the whole point of MVC is that a non-programmer web designer can work
on the template without dealing with programming, and that the web application
developer can work on the software that will process data without dealing with
how it will represented before the end-user.
I think web designers must not encounter code like the one below in their
templates:
"""
<?python
from yourapplication.lib.auth.predicates import from_ip
# In case it's not available in the templates by default:
from tg import evaluate
?>
<div py:if="${evaluate(from_ip('127.0.0.1')}">
The application is running on your own computer!
</div>
"""
But I won't oppose if people really want this available by default.
> By the way, checking a permission is not a good use case for this
> funciton since you can already easily do this in a template using
> tg.identity.user.permissions(),
No, that's in TG1 (I guess, I've only used TG2).
> and you can also easily add a
> has_permission() method to the user class.
I think it's the same thing, even if the predicate simply is not_anonymous.
> The need for such a function comes primarily if you have compound or
> custom predicate checkers (e.g. checking the ip addr). It's better if
> you can define them at one place only, and then use them for both
> restricting access to controllers and changing the behavior of
> controllers/views.
Sure, you can define single/compound predicate once and use it in many places.
But giving the ability to easily deal with predicates in the template is what
I wouldn't like.
Cheers! :)
--
Gustavo Narea <http://gustavonarea.net/>.
Get rid of unethical constraints! Get freedomware:
http://www.getgnulinux.org/
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