I would like to know if there is a way to add a fallback view name
when
a context is found but none of the defined view names match.  For
example, from the following example application:

    # coding: utf8
    from pyramid.config import Configurator

    class Foo(dict):
        pass

    def make_root(request):
        return {'foo': Foo()}

    def foo(request):
        return request.subpath

    def bar(request):
        return {"whoami": "bar", "subpath": request.subpath}

    def start(global_config, **settings):
        config = Configurator(settings=settings)
        config.set_root_factory(make_root)
        config.add_view(foo, context=Foo, renderer="json")
        config.add_view(bar, name="bar", context=Foo, renderer="json")
        return config.make_wsgi_app()

Traversal finds /foo and /foo/bar fine.  However, would it be possible
to configure a view (with context=Foo) to be used when the view_name
is
not found?

Thanks in advance.