Hi,
I'd like to override a validator (which I know is easy) but with a twist
- my validator needs to wrap around the automatically generated validators.
I am making a widget, GrowableRepeatingFieldSet, and I'd like the
validator to strip out any rows that are empty. The validator I have
seems to work fine - see below. But I am having to manually override the
validator when creating the widget, like this:
grfs = GrowableRepeatingFieldSet(fields=ContactFields())
grfs.validator = StripBlanks(grfs.validator)
Now, I would like GrowableRepeatingFieldSet to create itself with the
correct validator. But this is very difficult. The widget class has a
metaclass, MetaWidget, which decorates __init__. After the custom
__init__, for compound controls with repetitions the metaclass sets the
validator to be ForEach.
The code I already have is below. Thanks for any help!
Paul
class GrowableRepeatingFieldSet(RepeatingFieldSet):
javascript = [JSLink(my_static, "javascript/autogrow.js")]
def display(self, value=None, **params):
if value and type(value) == list:
params['repetitions'] = len(value) + 1
return super(AutoRepeatingFieldSet, self).display(value, **params)
class StripBlanks(validators.FancyValidator):
inner_validator = None
def __init__(self, inner_validator, **params):
super(StripBlanks, self).__init__(**params)
self.inner_validator = inner_validator
def _to_python(self, value, state):
val = self.inner_validator._to_python(value, state)
out = []
for i in val:
for k,v in i.iteritems():
if k == 'id':
continue
if v:
out.append(i)
break
#print len(out)
return out
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