[Twisted-Python] Adapter troubles - Copying Quotient's DivmodSession

[Justin Johnson]

It works now.  Thanks much!

On Fri, 3 Oct 2003 12:15:07 -0400, "Donovan Preston"
<dp at twistedmatrix.com> said:
> 
> On Oct 2, 2003, at 10:30 AM, Justin Johnson wrote:
> 
> > Hi,
> >
> > I've created a class called RatControlSession similar to DivmodSession 
> > in
> > Quotient.  I define IRatControlSession and RatControlSession, and I
> > register RatControlSession as an adapter from 
> > twisted.web.server.Session
> > to IRatControlSession.  However, when I try to do something like...
> >
> >     prefs = webinterfaces.IRatControlSession(request.getSession())
> >
> > I get the following error.  This is a cut-n-paste from what appears in
> > the browser.
> 
> <snip exception>
> 
> > I'm not sure what I'm doing wrong here.  I looked through components.py
> > but still don't see what the problem is.
> >
> > I've attached webinterfaces.py and session.py, setup similar to
> > quotient's respective files.  Also attached is pages.py which defines
> > wmfactory_action on MenuPage where I try to create an 
> > IRatControlSession
> > from request.getSession().
> 
>  From looking at the files, it looks like session is not getting 
> imported anywhere. You would think it wouldn't be a problem since you 
> are not directly using any of the objects in the module, but unless you 
> import a module, the code at the top level of that module does not get 
> executed. Thus the registerAdapter calls are never happening, and when 
> you go to request an adapter none is registered. Try putting "import 
> session" at the top of your pages file.
> 
> This is a major problem with using components and twisted -- where to 
> register the adapters. Of course, the implementation of components as 
> pioneered by Zope 3 uses a non-python file to register adapters (a zcml 
> file, a form of XML) and twisted should have something similar 
> (preferably not xml) but currently does not.
> 
> dp
> 
> 
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