Django FormWizard 如何动态更改 form_list [英] Django FormWizard how to change the form_list dynamically
问题描述
但是当我使用 done 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.
这是我所做的:
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
在第 0 步，我的 form_list 没问题:
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'>}
在第 1 步，我的 form_list 没问题:我们可以看到第二个表单是我期望的
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'>}
在第 2 步，我的 form_list 是 ko ；与第 0 步相同:我的第二个表单返回 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 并保持我在 get_context_data 中所做的更改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 ?
编辑这是适用于 Rohan 建议的完整代码:
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
与其在get_context_data()中更改表单列表等，我认为更合适的是实现get_form() 方法，并根据步骤和先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.
像这样:
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(您已正确完成)，而只需更改表单实例.为此，Django 提供了覆盖 get_form() 方法的方法.Django 会尊重这个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.
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