I'm quite new to pyramid and deform and I'm trying to achieve something
very simple that I suppose should work OOTB but I can't get it working.

I have a simple schema-based form and I want the fields to get the
selected value from the request once submitted.

Here's the schema:

class MySchema(colander.MappingSchema):
     department = colander.SchemaNode(
                     colander.String(),
                     default='',
                     widget=SelectWidget(values=departments),
                     )

where choices come from an external db trough sqlalchemy. The form works
but on every submit it lose selected value.

So, I tried the deferred approach [1] like this:

@colander.deferred
def deferred_choices_widget(node, kw):
     choices = kw.get('choices')
     return SelectWidget(values=choices)

@colander.deferred
def deferred_default(node, kw):
     return kw['request'].POST.get('department')

class MySchema(colander.MappingSchema):
     department = colander.SchemaNode(
                     colander.String(),
                     default=deferred_default,
                     widget=deferred_choices_widget,
                     )

I noticed that the request was not in 'kw' so I binded it to the schema:

schema = schema.bind(choices=departments,
                              default=default,
                              request=self.request)

Now I see the value into deferred_default call and I can get it using
`kw['request'].POST.get('department')` but there is no way to get it
into the form on reload after submit.

I can't find any meaningful step in the docs... what am I missing?

Versions: colander-0.9.8-py2.7,  deform-0.9.5-py2.7, pyramid-1.3.3-py2.7

Thanks,
SimO

[1] http://deformdemo.repoze.org/select_with_deferred/