Django FormWizard如何动态更改form_list [英] Django FormWizard how to change the form_list dynamically
问题描述
我可以动态调用与我从步骤ealier中选择的数据相关的一个表单< a>。
I'm able to dynamically call one form related to the data I chose from the step ealier.
但是当我在完成方法时，我可以看到我的 form_list 保持不变。
But when I'm in the done method I can see the my form_list is remaining unchanged.
这是我做的：
def get_form_list(request, form_list=None):
if form_list is None:
form_list = [ProviderForm, DummyForm, ConsummerForm, DummyForm, \
ServicesDescriptionForm]
return UserServiceWizard.as_view(form_list=form_list)(request)
class UserServiceWizard(SessionWizardView):
instance = None
def __init__(self, **kwargs):
self.form_list = kwargs.pop('form_list')
return super(UserServiceWizard, self).__init__(**kwargs)
def get_form_instance(self, step):
if self.instance is None:
self.instance = UserService()
return self.instance
def get_context_data(self, form, **kwargs):
data = self.get_cleaned_data_for_step(self.get_prev_step(
self.steps.current))
if self.steps.current == '1':
service_name = str(data['provider']).split('Service')[1]
form = class_for_name('th_' + service_name.lower() + '.forms',
service_name + 'ProviderForm')
self.form_list['1'] = form #here my form is correctly change I can see
elif self.steps.current == '3':
service_name = str(data['consummer']).split('Service')[1]
form = class_for_name('th_' + service_name.lower() + '.forms',
service_name + 'ConsummerForm')
self.form_list['3'] = form
context = super(UserServiceWizard, self).get_context_data(form=form,
**kwargs)
return context
def done(self, form_list, **kwargs):
print self.form_list #here form_list contains ProviderForm, DummyForm, ConsummerForm, DummyForm, ServicesDescriptionForm
在步骤0我的form_list是好的：
at step 0 my form_list is ok :
{u'0': <class 'django_th.forms.wizard.ProviderForm'>,
u'1': <class 'django_th.forms.wizard.DummyForm'>,
u'2': <class 'django_th.forms.wizard.ConsummerForm'>,
u'3': <class 'django_th.forms.wizard.DummyForm'>,
u'4': <class 'django_th.forms.base.ServicesDescriptionForm'>}
at第一步我的form_list是好的：我们可以看到第二个表单是我预期的一个
at step 1 my form_list is ok : we can see the 2nd form is my expected one
{u'0': <class 'django_th.forms.wizard.ProviderForm'>,
u'1': <class 'th_rss.forms.RssProviderForm'>,
u'2': <class 'django_th.forms.wizard.ConsummerForm'>,
u'3': <class 'django_th.forms.wizard.DummyForm'>,
u'4': <class 'django_th.forms.base.ServicesDescriptionForm'>}
在步骤2我的form_list是ko;与步骤0相同：我的第二个表单返回到DummyForm
at step 2 my form_list is ko ; same as step 0 : my 2nd form is return to DummyForm
{u'0': <class 'django_th.forms.wizard.ProviderForm'>,
u'1': <class 'django_th.forms.wizard.DummyForm'>,
u'2': <class 'django_th.forms.wizard.ConsummerForm'>,
u'3': <class 'django_th.forms.wizard.DummyForm'>,
u'4': <class 'django_th.forms.base.ServicesDescriptionForm'>}
如何更改self.form_list并保留我在 get_context_data 直到向导结束，而不是在每一步？
How can I do to change self.form_list and keep the change I did in get_context_data until the end of the wizard and not at each step ?
编辑
这里是完整的代码，与Rohan的建议一样工作：
EDIT here is the complete code that works fine with the Rohan's suggestion :
def get_form(self, step=None, data=None, files=None):
"""
change the form instance dynamically from the data we entered
at the previous step
"""
if step is None:
step = self.steps.current
if step == '1':
# change the form
prev_data = self.get_cleaned_data_for_step('0')
service_name = str(prev_data['provider']).split('Service')[1]
class_name = 'th_' + service_name.lower() + '.forms'
form_name = service_name + 'ProviderForm'
form_class = class_for_name(class_name, form_name)
form = form_class(data)
elif step == '3':
# change the form
prev_data = self.get_cleaned_data_for_step('2')
service_name = str(prev_data['consummer']).split('Service')[1]
class_name = 'th_' + service_name.lower() + '.forms'
form_name = service_name + 'ConsummerForm'
form_class = class_for_name(class_name, form_name)
form = form_class(data)
else:
# get the default form
form = super(UserServiceWizard, self).get_form(step, data, files)
return form
def done(self, form_list, **kwargs):
"""
Save info to the DB
The process is :
1) get the infos for the Trigger from step 0, 2, 4
2) save it to TriggerService
3) get the infos from the "Provider" and "Consummer" services
at step 1 and 3
4) save all of them
"""
# get the datas from the form for TriggerService
i = 0
for form in form_list:
# cleaning
data = form.cleaned_data
# get the service we selected at step 0 : provider
if i == 0:
trigger_provider = UserService.objects.get(
name=data['provider'],
user=self.request.user)
model_provider = get_service_model('provider', data)
# get the service we selected at step 2 : consummer
elif i == 2:
trigger_consummer = UserService.objects.get(
name=data['consummer'],
user=self.request.user)
model_consummer = get_service_model('consummer', data)
# get the description we gave for the trigger
elif i == 4:
trigger_description = data['description']
i += 1
# save the trigger
trigger = TriggerService(
provider=trigger_provider, consummer=trigger_consummer,
user=self.request.user, status=True,
description=trigger_description)
trigger.save()
model_fields = {}
# get the datas from the form for Service related
# save the related models to provider and consummer
i = 0
for form in form_list:
model_fields = {}
data = form.cleaned_data
# get the data for the provider service
if i == 1:
for field in data:
model_fields.update({field: data[field]})
model_fields.update({'trigger_id': trigger.id, 'status': True})
model_provider.objects.create(**model_fields)
# get the data for the consummer service
elif i == 3:
for field in data:
model_fields.update({field: data[field]})
model_fields.update({'trigger_id': trigger.id, 'status': True})
model_consummer.objects.create(**model_fields)
i += 1
return HttpResponseRedirect('/')
推荐答案
而不是在 get_context_data（）中更改表单列表等等，我想更多适当的是在向导视图中实现 get_form（）方法，并根据步骤和以前的数据返回不同的表单实例。
Instead of changing form list etc. in get_context_data(), I think more appropriate will be to implement get_form() method in your wizard view and return different form instance depending upon the step and previous data.
这样的东西：
class UserServiceWizard(SessionWizardView):
instance = None
def get_form(self, step=None, data=None, files=None):
if step is None:
step = self.steps.current
prev_data = self.get_cleaned_data_for_step(self.get_prev_step(
self.steps.current))
if step == '1':
service_name = str(prev_data['provider']).split('Service')[1]
form_class = class_for_name('th_' + service_name.lower() + '.forms',
service_name + 'ProviderForm')
form = form_class(data)
elif step == '3':
service_name = str(prev_data['consummer']).split('Service')[1]
form_class = class_for_name('th_' + service_name.lower() + '.forms',
service_name + 'ConsummerForm')
form = form_class(data)
else:
form = super(UserServiceWizard, self).get_form(step, data, files)
return form
这里的诀窍是不要更改表单列表的长度（您已经做了正确的），但只是改变窗体实例。为此，Django提供了覆盖 get_form（）方法的方法。 Django将遵守此方法，并始终使用它来获取该方法的表单实例。
The trick here is do not change the length of form list (which you have done correctly), but just change form instance. Django has provided way to override get_form() method for this purpose. Django will honor this method and always use it to get the form instance for the method.
这篇关于Django FormWizard如何动态更改form_list的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
