try one more thing:
form = SQLFORM(....)
form.element('input#appointment_participants')
['requires']=IS_NOT_EMPTY()
if form.accepts(...)
The problem is that the custom widget interfere with validators and
validators may have to be attached to the widget.
On Jul 24, 8:22 am, Iceberg <[email protected]> wrote:
> Hi Massimo,
>
> Thanks for trying to help. Perhaps I did not clearly explain the
> point.
>
> I hope to add an IS_NOT_EMPTY() constraint to any "list:reference
> table_name" field. My previous snippet is copied from web2py book, but
> in my real need, that "list:reference" field is not necessary a tag.
> So I'm not going to plugin_tagging or plugin_wiki direction. Instead
> you can think about a booking system inside a company.
>
> db.define_table('employee', Field('name'))
> db.define_table('appointment',
> Field('subject', 'string'),
> Field('participants', 'list:reference employee'),
> )
>
> So I don't need any comma-separated-employee-name UI. In fact the
> default widget for list:reference is already great. What I need is
> just make sure any appointment will have at least one participant.
>
> Can we somehow hook a IS_NOT_EMPTY() into list:reference 's default
> widget? Thanks!
>
> Regards,
> Ray (a.k.a. Iceberg)
>
> On Jul 24, 3:16 pm, Massimo Di Pierro <[email protected]>
> wrote:
>
>
>
>
>
>
>
> > I understand and what you need to do is a bit more complex than needs
> > to be. For this reason we have plugin_tagging and tagging in
> > plugin_wiki. Another approach is the following...
>
> > class TAGGING:
> > def __call__(self,field,value):
> > return INPUT(_name='%s_%s' % (field._tablename,field.name),
> > _value=', '.join(r.name for r in
> > db(db.tag.id.belongs(value or [])).select()),
> > requires = self.validate)
> > def validate(self,tags):
> > names = [x.strip() for x in tags.split(',')]
> > ids = [r.id for r in
> > db(db.tag.name.belongs(names)).select()]
> > if len(ids) < len(names):
> > return (ids, "one of the tags is invalid or repeated")
> > return (ids,None)
>
> > db.define_table('tag',
> > Field('name', requires=IS_NOT_EMPTY()), format='%
> > (name)s')
> > db.define_table('product',
> > Field('name', requires=IS_NOT_EMPTY()),
> > Field('tags', 'list:reference tag',widget=TAGGING()),)
>
> > def testme():
> > return {
> > 'a': crud.update(db.product, request.args(0)),
> > 'b': crud.select(db.product),
> > }
>
> > The custom TAGGING widget renders the list of IDS as a a list of comma-
> > separated names. You can also cache the mapping between ids and tag
> > names for speed.
