On Sep 27, 2006, at 1:10 PM, Timur Izhbulatov wrote:
>
> Hi,
>
> I got a problem using @exception_handler together with Cheetah.
>
> Consider a situation:
>
> # in cheetah1/controllers.py
> from turbogears import controllers, expose, exception_handler
>
> class Root(controllers.RootController):
> def get_data(self):
> raise ValueError('Error!')
> return dict(a=1)
>
> def error(self, tg_exceptions=None):
> return dict(exception=str(tg_exceptions))
>
> @exception_handler(error, rules="True")
> @expose(template="cheetah:cheetah1.templates.site")
> def index(self):
> data = self.get_data()
> return data
>
> # in cheetah1/templates/site.tmpl
> a: $a
>
> I expect @exception_handler to handle the ValueError exception
> before @expose
> renders the template. But it looks like @expose is called before
> @exception_handler and Cheetah.Template.NotFound raises. In this
> situation I
> have to handle the exception in the method body and change the
> template
> dynamicaly:
>
> @expose(template="cheetah:cheetah1.templates.site")
> def index(self):
> try:
> data = self.get_data()
> except ValueError, error:
> return (dict
> (tg_template='cheetah:cheetah1.templates.error',
> error=error))
> return data
>
> But @exception_handler is not used and I lose all the benefits it
> gives! Is it
> posible to solve this problem without writing custom template
> plugin/decorator/whatever?
>
> Thanks in advance,
errorhandling only catches exceptions raised *inside* controller
methods (well, and SA's run_with_transaction to catch db backend
exceptions). The exception from Cheetah is raised somewhere inside
expose so errorhandling can't help you there, sorry :(
You could use the internal view._choose_engine function (though,
being internal, I'd rather not endorse doing it) to load the template
inside your controller (or by using a decorator which stacks before
expose in order to give errorhandling a chance to trap it) and then
returning the loaded ttemplate at tg_template.
That's would probably not break in 1.0 but keep in mind you're
walking on muddy paths ;)
Alberto
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