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Hi,

I'm trying to create a machinery to handle renderer exceptions.

Considere the following template:

<span nevow:render="main_page">

<span nevow:pattern="main_pattern"> ... </span>

<span nevow:pattern="safe_pattern"> <span nevow:render="handle_err">Oops, there was an exception</span> </span>

</span>

The idea is to define a base class so that, for each page based on such template, on renderer exceptions, the main pattern is deleted and the failsafe pattern is filled with a human readable error.

For example:

class basePage(rend.Page):

def render_main_page(self, ctx, d): try: render_the_main_pattern(...)

except Exception, err: self.strexception= str(err) render_the_safe_pattern(...)

def render_handle_err(self, ctx, d): if hasattr(self, 'strexception'): return self.strexception return 'UfoError'

class OtherPage(basePage): ...

It would be very nice to have such machinery: how can I choose to render the safe_pattern if and only if the main pattern rendering fails?

Otherwise, is there in your opinion a better strategy?

- -- efphe Today is Setting Orange, the 55th day of Chaos in the YOLD 3174