[Twisted-web] nested nevow:data?

Mon Aug 2 12:20:54 MDT 2004

It is possible. The problem is probably elsewhere, perhaps one of the
methods is misbehaving or does not exist. It can often be hard to tell
from the traceback because almost everything in nevow is deferred, so
the problem is not manifest until long after it was encountered.

On Mon, Aug 02, 2004 at 10:36:40AM -0700, Jeff Bowden wrote:
> Should it be possible to nest nevow:data declarations in a template?  E.g.
> 
>    <html nevow:data="order" nevow:render="order">
>    <head><title>Order <nevow:slot name="order_number"/></title></head>
>    <body>
>      <h1>Order <nevow:slot name="order_number"/></h1>
>      <ul nevow:data="order_items" nevow:render="sequence">
>        <li nevow:pattern="item" nevow:render="mapping">
>           ... slots and stuff
>        </li>
>       </ul>
>    </body>
> 
> 
> When I do this I get a big long stack trace rooted in 
> nevow/accessors.py.  It works fine if I remove the outer 
> nevow:data="order" (and dummy up a static fillSlots call for 
> "order_number" in render_order).  It also works if I remove the inner 
> section.
> 
> I can work around the problem by putting the nevow:data="order" 
> declaration  in multiple places but it would be handy if I didn't have 
> to.  Is this a bug or is it by design?