Problems creating custom multi-widget....

[mediumgrade]

I am trying to create my own Dojo-aware Django widgets. I have defined
the following


class DojoDateWidget(forms.widgets.DateTimeInput):
format = '%Y-%m-%d'

def __init__(self, *args, **kwargs):
kwargs.setdefault('attrs', {}).update({'dojoType':
"dijit.form.DateTextBox",
'required': kwargs.pop
('required', False),
'constraints': mark_safe
("{datePattern:'MM/dd/yyyy'}"),
})
attrs = kwargs['attrs']

if kwargs.get('promptMessage', None) is not None:
attrs['promptMessage'] = kwargs.pop('promptMessage')

super(DojoDateWidget, self).__init__(*args, **kwargs)



class DojoTimeWidget(forms.TimeInput):

input_type = 'text'

def __init__(self, *args, **kwargs):
kwargs.setdefault('attrs', {}).update({'dojoType':
"dijit.form.TimeTextBox",
'required': kwargs.pop
('required', False),
#'constraints': mark_safe
("{timePattern:'HH:mm'}"),
})
attrs = kwargs['attrs']

if kwargs.get('promptMessage', None) is not None:
attrs['promptMessage'] = kwargs.pop('promptMessage')

self.input_formats = ['T%H:%M:%S']

super(DojoTimeWidget, self).__init__(*args, **kwargs)


def render(self, name, value, attrs=None):
if value is None:
value = ''
elif isinstance(value, time):
value = value.replace(microsecond=0)

#For Dojo TimeTextBox formatting.
#Requires T14:30:59 (there's a 'T' in front)
value = 'T%s' % value

return super(DojoTimeWidget, self).render(name, value, attrs)



class DojoDateTimeWidget(forms.widgets.MultiWidget):

def __init__(self, attrs=None):
widgets = (DojoDateWidget, DojoTimeWidget)
super(DojoDateTimeWidget, self).__init__(widgets, attrs)

def decompress(self, value):
if value:
return [value.date(), value.time().replace(microsecond=0)]
return [None, None]



The DojoDateWidget and DojoTimeWidget validate correctly when
submitting in a form. However, when I leave the DojoDateTimeWidget
blank in a form, Django sees the empty values as ['', ''] as opposed
to simply None which causes the form validation to say that the date
time format is invalid. I see that the decompressed null value for the
widget is "return [None, None]" but this is the same as the Django
built-in SplitDateTimeWidget and when I simply return "None" I get the
error message "'NoneType' object is unsubscriptable". How do I get my
datetime widget to correctly send an empty value?