答案似乎是否定的:为每个组/字段集z3c.form.group.Group.extractData
调用z3c.form.form.BaseForm.extractData
一次,并且该调用已经包含不变验证。
除了注册自己的处理程序之外,您还可以覆盖extractData:
from plone.directives import form, dexterity
from z3c.form.interfaces import ActionExecutionError,WidgetActionExecutionError
# ...
class EditForm(dexterity.EditForm):
grok.context(IMyEvent)
def extractData(self, setErrors=True):
data, errors = super(EditForm, self).extractData(setErrors)
if not None in(data['start'], data['end']):
if data['end'] < data['start']:
raise WidgetActionExecutionError('end', Invalid(_(u"End date should not lie before the start date.")))
if data['end'] - data['start'] > datetime.timedelta(days=7):
raise WidgetActionExecutionError('end', Invalid(_(u"Duration of convention should be shorter than seven (7) days.")))
return data, errors
请注意,此类派生自 dexterity.EditForm,其中包括 Dexterity 的默认处理程序,而不是 form.SchemaForm。
WidgetActionExecutionError
但是,不能可靠地工作。对于某些字段,它会产生“KeyError”。