def extractData(self):
""" Override to be able to provide defaults
"""
data, errors = Form.extractData(self)
for k, v in data.items():
if not v:
default = getattr(self, 'default_' + k, None)
if default:
value = data[k] = default()
if not value:
continue
widget = self.widgets[k]
widget.value = value
field = widget.field.bind(self.context)
field.default = value
widget.field = field
widget.ignoreRequest = True
widget.update()
return data, errors