[Twisted-web] Problem using formless with a deferred value

[Tommi Virtanen]

Gavrie Philipson wrote:

>Am I doing something wrong here, or is this a bug in Twisted or Nevow?
>  
>
The former.

>class Implementation(object):
>    __implements__ = IMyForm,
>
>    def bar(self, baz):
>
>        def _cb():
>            print "Done!"
>            return "hello..."
>
>        print "baz!", baz
>
>        d = defer.Deferred()
>        reactor.callLater(0, _cb)
>
>        return d
>  
>
Your _cb is in no way connected to the Deferred.
Try

    def bar(self, baz):
        def _cb(result):
            print "Done!", result
            return "hello..."

        print "baz!", baz

        d = defer.Deferred()
	d.addCallback(_cb)
        reactor.callLater(0, d.callback, 42)
        return d