目前,我有以下内容:
class ConfirmStepAView(UpdateProcessView):
form_class = ConfirmationForm
def validate(self):
if not self.process.A:
raise ValidationError
class ConfirmStepBView(UpdateProcessView):
form_class = ConfirmationForm
def validate(self):
if not self.process.B:
raise ValidationError
# Usage:
flow.View(ConfirmStepAView)
flow.View(ConfirmStepBView)
如何编写一个动态生成这些类的工厂方法,这样我可以做这样的事情?
flow.View(ConfirmStepViewFactory('A'))
flow.View(ConfirmStepViewFactory('B'))
flow.View(ConfirmStepViewFactory('Something'))
flow.View(ConfirmStepViewFactory('Else'))
注意:我必须使用这种格式,因为我正在使用第三方库。
这是一种常见的模式。您可以利用python中的闭包来动态创建和返回您的类。
def make_ConfirmStepView(attribute):
class ConfirmStepView(UpdateProcessView):
form_class = ConfirmationForm
def validate(self):
if not getattr(self.process, attribute):
raise ValidationError
return ConfirmStepView
flow.View(make_ConfirmStepView('A'))
flow.View(make_ConfirmStepView('B'))
flow.View(make_ConfirmStepView('Something'))
flow.View(make_ConfirmStepView('Else'))