This validator handles a case where at least one of several fields must be
non-blank.
class IS_NOT_ALL_EMPTY(object):
"""Class representing a validator requiring at least one non-empty field in
a set. """
def __init__(self, others,
error_message='Enter a value in at least one field'):
self.others = others
self.error_message = error_message
def __call__(self, value):
okay = (value, None)
error = (value, self.error_message)
# Return okay either the 'value', or one of self.others is not empty.
values = []
values.append(value)
values.extend(self.others)
empties = []
for v in values:
unused_v, empty = is_empty(v)
empties.append(empty)
# Example empties == [True, True, False]
# If one False exists, it's valid
if reduce(lambda x, y: x and y, empties):
return error
return okay
Usage:
db.define_table('contact',
Field('name', 'string'
requires=IS_NOT_ALL_EMPTY([request.vars.organization],
error_message='Enter a name or an organization'),
),
Field('organization', 'string',
requires=IS_NOT_ALL_EMPTY([request.vars.name],
error_message='Enter a name or an organization'),
))
Cheers,
Jim Karsten
