_and does not work with multiple. This is not an easy fix because it
presents a logical problem: it is not clear if the _and should apply
to the list or to each element.
You can do:
class IS_NOT_EMPTY_LIST_OF_REFERENCES(IS_IN_DB):
def __init__(self, *a, **b):
IS_IN_DB.__init__(self,*a,**b)
def __call__(self, value):
if value == "||" or value == "":
return (value, self.error_message)
else:
return IS_IN_DB.__call__(self,value)
db.data.elements.requires =
IS_NOT_EMPTY_LIST_OF_REFERENCES(db,'element.id',multiple=True)
On Sep 15, 10:36 am, "dustin.b" <dustin.bens...@googlemail.com> wrote:
> hi my secound stupid beginner question but i cant get behind it.
>
> i have a list:ref.. to choose multiple values but i need it to be not
> empty. the problem when i use the IS_NOT_EMPTY validator is that the
> field is not empty but "||" for an empty list i think (thats what i
> have in database in this case)
>
> so i started to write my own Validator and check against that. this
> isnt my first validator , but this time i doesn't work as i exspect.
> every time i submit the form only "INIT IS_NOT_EMPTY_LIST" is printet
> out .. but no "CALL IS_NOT_EMPTY_LIST" .. as in my other validators.
>
> if there is an other way around checking empty lists this would be
> also fine ..
>
> here's the code
>
> class IS_NOT_EMPTY_LIST(object):
> def __init__(self, unused, error_message='failed ..'):
> self.unused = unused
> self.error_message = error_message
> print "INIT IS_NOT_EMPTY_LIST"
> def __call__(self, value):
> print "CALL IS_NOT_EMPTY_LIST"
> try:
> if value == "||" and value == "":
> return (value, self.error_message)
> else:
> return (value, None)
> except:
> return (value, self.error_message)
>
> db.define_table('element', Field('name'))
>
> db.define_table('data', Field('name', 'string'),
> Field('elements','list:reference element' ))
>
> db.data.elements.requires = IS_IN_DB(db,'element.id',multiple=True,
> _and=IS_NOT_EMPTY_LIST(None, error_message='foo'))
