[Zope3-Users] Re: How to extend File?

[jürgen Kartnaller]

This works well for me.
I used a configure.zcml by following Stephan Richters Zope 3 book.
I'm now able to add a new file object with a guid field.

You should give us the traceback of the system error.

Jürgen

John Toews wrote:
> Hi all,
> 
> I'm trying to do something I thought would be very simple. I think I
> don't understand the Component Architecture well enough...
> 
> I want to take the base File and simply add a property to it (a string
> representing a guid). That's all, everything else would remain the same.
> I've tried a couple different ways of doing:
> 
> class IContentGuid(Interface):
> 	guid = TextLine(title=_('guid desc'))
> 
> class ContentBase(File):
> 	zope.interface.implements(IContentGuid)
> 
> And various configure.zcml setups. I can't really explain what's going
> wrong either. The best I've gotten is a link in the ZMI to ContentBase,
> which when clicked on will add an item, but after typing in a name and
> hitting Apply, a system error occurs. I think I'm just on the wrong
> track.
> 
> Any ideas on what (all) I'm doing wrong?
> Thanks!
> John