> Before I get into my specific code, here's a quick contrived example
> of how it currently works and how I think it should work:
>
> @expose(template='.foo')
> def test(self):
> class TestObj(object):
> def __init__(self):
> self.testval='three:3'
>
> class TestValidator:
> def to_python(self, value, state=None):
> log.info('Call to_python on value "%s"', value)
> result = {'1':'one:1',
> '2':'two:2',
> '3':'three:3',
> '4':'four:4',
> '5':'five:5' }.get(value, None)
> if result is None: raise Invalid('Bad Value', value,
> state)
> return result
> def from_python(self, value, state=None):
> log.info('Call from_python on value "%s"', value)
> name, id = value.split(':')
> return id
>
> class TestFields(WidgetsList):
> testval=SingleSelectField(
> 'testval', label='Test Value',
> options=[('1','one'), ('2','two'), ('3','three'),
> ('4','four')],
> validator=TestValidator())
>
> test_form = TableForm('test', fields=TestFields())
>
> return dict(form=test_form,
> item=TestObj())
>
> The template has the expected ${form.display(item)}. If I use the
> widgets code as-is, I get the following log output:
>
> ...
> 2007-03-04 07:00:58,853 tutornet.controllers INFO Call to_python on
> value "three:3"
> 2007-03-04 07:00:58,982 tutornet.controllers INFO Call to_python on
> value "three:3"
> 2007-03-04 07:00:58,982 tutornet.controllers INFO Call to_python on
> value "three:3"
> 2007-03-04 07:00:58,983 tutornet.controllers INFO Call to_python on
> value "three:3"
>
> And of course, no option in the select field is ever selected. If I
> switch the widgets code to call from_python, however, I get the
> following log output:
>
> ...
> 2007-03-04 07:04:34,820 tutornet.controllers INFO Call from_python on
> value "three:3"
> 2007-03-04 07:04:34,822 tutornet.controllers INFO Call from_python on
> value "three:3"
> 2007-03-04 07:04:34,823 tutornet.controllers INFO Call from_python on
> value "three:3"
> 2007-03-04 07:04:34,825 tutornet.controllers INFO Call from_python on
> value "three:3"
>
> And the third option is correctly selected.
To me it looks as if you reversed the to- and from-values - no wonder
that you need to switch the calls.
Your option list is this:
[('1','one'), ('2','two'), ('3','three'), ('4','four')]
Which means that '1', '2', ... _are_ the *python* values we're talking
here about.
But in your validator's _to_python-call, you map '1' to 'one:1'.
Now obviously '1' != 'one:1' and so forth, so that the selected item
will never get displayed correctly.
So either your option-list reads
[('one:1','one'), ('two:2','two'), ('three:3','three'), ('four:4','four')]
or your mapping has to work differently.
Diez
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