On Thu, 2012-04-12 at 09:42 +0200, Damien Baty wrote:
> Hello,
>
> I would like Peppercorn or Deform to ignore some HTML fields when
> validating a form. I have a Deform widget (here below called
> "ExtendedAutocompleteInputWidget") that has two HTML fields: a visible
> text input ('person_autocomplete') and an hidden text input ('person'),
> the former being for presentation purpose only, the latter holding the
> value to be stored), and the following schema:
>
> --- 8< ---
> class Person(SequenceSchema):
> person = SchemaNode(
> String(),
> widget=ExtendedAutocompleteInputWidget())
>
> class DemoSchema(Schema):
> persons = Person(widget=SequenceWidget(min_len=1))
> --- 8< ---
>
> I get the following POSTed items:
>
> ('__start__', u'persons:sequence'),
> ('person', u'1'),
> ('person_autocomplete', u'John Smith'),
> ('person', u'2'),
> ('person_autocomplete', u'Jane Doe'),
> ('__end__', u'persons:sequence')
>
> Currently, Peppercorn "eats" all HTML fields and transforms this into a
> record of 4 items that are all mapped to the 'persons' sequence. I would
> like Deform/Peppercorn to only record 2 items (those named 'person' --
> like the field). Am I misusing SequenceSchema? (Note that this "bug"
> does not appear when the two-HTML-field widget appears in a MappingSchema.)
>
> If I am not misusing anything, how could I work around or fix that?
> For now, I call a cleaning method before passing the POSTed data to
> 'Form.validate' but I would like to move this responsibility to the
> widget itself, Deform or Peppercorn.
>
> I suppose that the best option would be to ask each widget if it needs
> to remove meaningless HTML fields that it introduced. In
> 'Field.validate()', before passing the controls to 'peppercorn.parse()',
> we could iterate over each widget of the schema and call
> 'widget.ignore_fields()' if the widget defines such a method. Another
> (much easier) option would be to make Peppercorn ignore some fields, for
> example those whose name ends with '__no_peppercorn__'. Any idea or
> preference?
Have the deserialize() of the widget strip the unnecessary field data
out of the cstruct it returns. See deform's CheckedInputWidget for an
example.
- C
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