Re: templ_context / c variable getting reset after first request

[Marius Gedminas]

On Wed, Oct 06, 2010 at 08:42:21AM -0700, Matt H wrote:
> Hi.
> 
> I'm trying to set an attribute on c from a decorator, like so:
> 
> def dec1():
>     def wrap_fn(f):
>         c.msg = 'hi'

You're doing this assignmeny once, when wrapping the function (i.e. at module
import time).  You need to do this for every request, i.e. when f gets
called.

>         return f
>     return wrap_fn
> 
> @dec1
> def create(self):

This will fail; I assume you meant @dec1().  (And since it makes no sense
to have a decorator-making function with no arguments, I assume you've
reduced your real code to an example and made a mistake.)

>    return render('create_tmpl')

Correct code would be something like

    def dec1():
        def wrap_fn(f):
            def wrapped_fn(*args, **kw):
                c.msg = 'hi'
                return f(*arg,s **kw)
            return wrapped_fn
        return wrap_fn

    @dec1()
    def create(self):
        return render('create_tmpl')

Even more correct code would use http://pypi.python.org/pypi/decorator,
like Wyatt suggested:

    def dec1():
        @decorator
        def wrap_fn(f, *args, **kw):
            c.msg = 'hi'
            return f(*arg,s **kw)
        return wrap_fn

    @dec1()
    def create(self):
        return render('create_tmpl')

HTH,
Marius Gedminas
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