Hello, I'm trying to implement a menu with the attached code, but it fails with the following error: exceptions.NotImplementedError: There is no flattener function registered for object <Menu object at 0xb76dd42c> of type <class 'Menu'>. Locals flattener None obj <Menu object at 0xb76dd42c> context WovenContext(tag=Tag('li', children=[<Menu object at 0xb76dd42c>])) I'm using http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/286260 as a reference for this sample implementation. The idea is to define two objects, Menu and MenuItem, and then to define and to register adapters for each object type. I don't understand why it complains about flatteners not defined. Isn't that covered by the registered adapters? I'd appreciate any help. Thank you, -- Pedro PS. I test the program running: $ twistd -noy menu.py
On Fri, Aug 19, 2005 at 07:14:34PM -0400, Pedro Sanchez wrote:
Hello,
I'm trying to implement a menu with the attached code, but it fails with the following error:
exceptions.NotImplementedError: There is no flattener function registered for object <Menu object at 0xb76dd42c> of type <class 'Menu'>.
...
I don't understand why it complains about flatteners not defined. Isn't that covered by the registered adapters? I'd appreciate any help.
Thank you,
-- Pedro
It used to work like that. A while ago, a change was made to how flatteners are registered; nevow.flat.registerFlattener is the new way to do it: from nevow import flat class Bleh(object): pass def flattenBleh(original, context): return 'a bleh thing' flat.registerFlattener(flattenBleh, Bleh)
Phil Frost wrote:
On Fri, Aug 19, 2005 at 07:14:34PM -0400, Pedro Sanchez wrote:
Hello,
I'm trying to implement a menu with the attached code, but it fails with the following error:
exceptions.NotImplementedError: There is no flattener function registered for object <Menu object at 0xb76dd42c> of type <class 'Menu'>.
...
I don't understand why it complains about flatteners not defined. Isn't that covered by the registered adapters? I'd appreciate any help.
Thank you,
-- Pedro
It used to work like that. A while ago, a change was made to how flatteners are registered; nevow.flat.registerFlattener is the new way to do it:
from nevow import flat
class Bleh(object): pass
def flattenBleh(original, context): return 'a bleh thing'
flat.registerFlattener(flattenBleh, Bleh)
Thanks, I will check this. However, the recipe in the Python cookbook website works well and it doesn't use the interface you mention. So my code should in theory work, provided I fix whatever is broken :) -- Pedro
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The original version of my program registers Adapters and fails because of flatteners. Following your suggestion, here is a version registering flatteners instead. And it fails because of Adapters :| twisted.python.components.CannotAdapt: <Menu object at 0xb77581ec> to <MetaInterface nevow.inevow.IRenderer> I'd appreciate any suggestions. Thanks, -- Pedro Sanchez, Pedro [CAR:1A10:EXCH] wrote:
Phil Frost wrote:
On Fri, Aug 19, 2005 at 07:14:34PM -0400, Pedro Sanchez wrote:
Hello,
I'm trying to implement a menu with the attached code, but it fails with the following error:
exceptions.NotImplementedError: There is no flattener function registered for object <Menu object at 0xb76dd42c> of type <class 'Menu'>.
...
I don't understand why it complains about flatteners not defined. Isn't that covered by the registered adapters? I'd appreciate any help.
Thank you,
-- Pedro
It used to work like that. A while ago, a change was made to how flatteners are registered; nevow.flat.registerFlattener is the new way to do it:
from nevow import flat
class Bleh(object): pass
def flattenBleh(original, context): return 'a bleh thing'
flat.registerFlattener(flattenBleh, Bleh)
Thanks,
I will check this. However, the recipe in the Python cookbook website works well and it doesn't use the interface you mention. So my code should in theory work, provided I fix whatever is broken :)
from twisted.application import internet, service from nevow import appserver, inevow, rend, compy, loaders, url from nevow import tags as T from nevow import flat class Menu(object): def __init__(self, title, *items): self.title = title self.items = items class MenuItem(object): def __init__(self, title, target): self.title = title self.target = target def MenuView(original, context): return T.div[ T.p[original.title], T.ul[[T.li[x] for x in original.items]] ] def MenuItemView(original, context): return T.a(href=original.title)[original.target] flat.registerFlattener(MenuView, Menu) flat.registerFlattener(MenuItemView, MenuItem) # some data menu = Menu('Main Menu', Menu('Item 1', MenuItem('1-1', url.root.child('oneone')), MenuItem('1-2', url.root.child('onetwo')), ), MenuItem('2', url.root.child('two')), MenuItem('3', url.root.child('three')) ) class Page(rend.Page): def render_menu(self, context, data): return inevow.IRenderer(data) def data_menu(self, context, data): return menu docFactory = loaders.stan( T.html[ T.body[ T.invisible(render=T.directive('menu'), data=T.directive('menu')) ] ]) site = appserver.NevowSite(Page()) application = service.Application("menu") httpd = internet.TCPServer(8000, site).setServiceParent(application)
participants (2)
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Pedro Sanchez -
Phil Frost