动态表单的Django Formwizard不会进行下一步 [英] Django Formwizard with dynamic form does not proceed to next step

问题描述

我正在尝试创建一个django formwizard，其中第一个表单在运行时生成了一个选择字段。我可以使用正确的选择生成表单，但是当我单击提交时，formwizard不会继续进行下一步。它提交表单，但返回form1。这是我的表单和视图

  ##表单
 class EventForm1（forms.Form）：
 def __init __（self，* args，** kwargs）：
 ##在运行时获取选项
 choices = kwargs.pop（'loan_choices'，[]）
 super（EventForm1，self）。 __init __（* args，** kwargs）
 self.fields ['loan'] = forms.ChoiceField（choices = choices，required = False，widget = forms.Select（attrs = {'class'：'events_loan_name' ，'event_attribute'：'loan'，'name'：'loan'}））
 attribute_to_change = forms.ChoiceField（choices = [（'monthly_payment'，'Monthly Payment'），（'interest_rate'价格'）]，widget = forms.Select（attrs = {'class'：'attribute_to_change'，'name'：'attribute_to_change'，'event_attribute'：'attribute_to_change'}））
 
 class EventForm2 （forms.Form）：
 start_date = forms.DateField（widget = forms.TextInput（attrs = {'class'：'event_dates'，'start_date'：'start_date'，'na我''：'event_start_date'，'event_attribute'：'start_date'}））
 
 ##视图
类EventFormWizard（SessionWizardView）：
事件
 
 def done（self，form_list，** kwargs）：
 self.finalize_new_event（form_list）
 return HttpResponseRedirect（'/'）
 
 def get_form（self，step = None，data = None，files = None）：
 form = super（EventFormWizard，self）.get_form（step，data，files）
 
 ＃确定步骤如果没有给出
如果步骤为无：
 step = self.steps.current 
 
打印（步骤，表单）
如果step == 0：
 loan_sessions = self.request.session.get（'loan_sessions'，无）
如果loan_sessions！=无：
 loan_sessions = pickle.loads（self.request.session [' loan_sessions']）
 else：
 loan_sessions = [] 
 
 loan_choices = [] 
在loan_session中的loan_session：
 loan_choice =（loan_session ['number']，loan_session ['name']）
 loan_choices.append（loan_choice）
 
 ##更新选择
 form = EventForm1（loan_choices = loan_choices）
 
返回形式
 
 def finalize_new_loan（self，form_list）：
添加一个自动属性到新的贷款，将其保存到loan_sessions并从会话中删除新的贷款对象
 
表单中的form_list：
 cleaning_data = form.cleaned_data 
打印（clean_data）
  

我正在使用django 1.8和form-tools包。 >

解决方案

我发现发生了什么。表单向导的post方法调用get_form，如下所示：

 ＃获取当前步骤的表单
 form = self。 get_form（data = self.request.POST，files = self.request.FILES）
 
 print（form.is_valid（），form.errors，form.is_bound）
＃并尝试验证
如果form.is_valid（）：
＃如果表单有效，请存储清除的数据和文件。 
 self.storage.set_step_data（self.steps.current，
 self.process_step（form））
 self.storage.set_step_files（self.steps.current，
 self.process_step_files （form））
 
＃检查当前步骤是最后一步
如果self.steps.current == self.steps.last：
＃没有更多的步骤，渲染完成视图
 return self.render_done（form，** kwargs）
 else：
＃转到下一步
返回self.render_next_step（form）
 return self 。$ {$ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ 
 
 
如果当前窗体验证，它只调用下一步的窗体，是因为我的自定义get_form钩子在创建动态窗体时不检查POST数据。无论如何，这里是工作的自定义get_form钩子：
  def get_form（self，step = None，data = None，files = None） ：
 form = super（EventFormWizard，self）.get_form（step，data，files）
 
＃确定步骤，如果没有给出
如果步骤为无：
 step = self.steps.current 
 
如果step ==0：
 loan_sessions = self.request.session.get（'loan_sessions'，无）
如果loan_sessions！ =无：
 loan_sessions = pickle.loads（self.request.session ['loan_sessions']）
 else：
 loan_sessions = [] 
 
 loan_choices = [] 
在loan_session中的loan_session：
 loan_choice =（loan_session ['number']，loan_session ['name']）
 loan_choices.append（loan_choice）
 
 ##在启动表单时传递数据，即POST 
 ##数据如果如果表单向导
 ##在render_done方法中再次验证此表单，则在post 
 ##或self.storage.get_step_data（form_key）期间调用gets_form函数
 form = EventForm1（ loan_choices = loan_choices，data = data）
 
返回表单
  
 
I am trying to create a django formwizard where the first form has a choicefield generated at runtime. I can generate the form with the correct choices but when I click submit the formwizard does not proceed to the next step. It submits the form but returns to form1. Here are my forms and view
##Forms
class EventForm1(forms.Form):
    def __init__(self, *args, **kwargs):
        ##Get choices at runtime
        choices = kwargs.pop('loan_choices', [])
        super(EventForm1, self).__init__(*args, **kwargs)
        self.fields['loan'] = forms.ChoiceField(choices=choices, required=False, widget=forms.Select(attrs={'class':'events_loan_name', 'event_attribute':'loan', 'name':'loan'}) )
    attribute_to_change = forms.ChoiceField(choices=[('monthly_payment','Monthly Payment'), ('interest_rate','Interest Rate')], widget=forms.Select(attrs={'class': 'attribute_to_change', 'name':'attribute_to_change', 'event_attribute':'attribute_to_change'}))

class EventForm2(forms.Form):
    start_date = forms.DateField(widget=forms.TextInput(attrs={'class': 'event_dates','start_date':'start_date', 'name':'event_start_date', 'event_attribute':'start_date'}))

##Views
class EventFormWizard(SessionWizardView):
    """Form wizard for adding an event"""

    def done(self, form_list, **kwargs):
        self.finalize_new_event(form_list)
        return HttpResponseRedirect('/')

    def get_form(self, step=None, data=None, files=None):
        form = super(EventFormWizard, self).get_form(step, data, files)

        # determine the step if not given
        if step is None:
            step = self.steps.current

        print(step, form)
        if step == "0":
            loan_sessions = self.request.session.get('loan_sessions', None)
            if loan_sessions != None:
                loan_sessions = pickle.loads(self.request.session['loan_sessions'])
            else:
                loan_sessions = []

            loan_choices = []
            for loan_session in loan_sessions:
                loan_choice = (loan_session['number'], loan_session['name'])
                loan_choices.append(loan_choice)

            ##Update the choices for the select 
            form = EventForm1(loan_choices=loan_choices)

        return form

    def finalize_new_loan(self, form_list):
        """Adds a autmatic properties to the new loan, saves it to the loan_sessions and deletes the new loan object from the session"""

        for form in form_list:
            cleaned_data = form.cleaned_data
            print(cleaned_data)
I'm using django 1.8 with the form-tools package.
解决方案
I discovered what's going on. The form wizard's post method calls get_form like so:
        # get the form for the current step
        form = self.get_form(data=self.request.POST, files=self.request.FILES)

        print(form.is_valid(), form.errors, form.is_bound)
        # and try to validate
        if form.is_valid():
            # if the form is valid, store the cleaned data and files.
            self.storage.set_step_data(self.steps.current,
                                       self.process_step(form))
            self.storage.set_step_files(self.steps.current,
                                        self.process_step_files(form))

            # check if the current step is the last step
            if self.steps.current == self.steps.last:
                # no more steps, render done view
                return self.render_done(form, **kwargs)
            else:
                # proceed to the next step
                return self.render_next_step(form)
        return self.render(form)
It only calls the next step's form if the current form validates, which it never does because my custom get_form hook doesn't check for the POST data when creating the dynamic form. Anyway here is the working custom get_form hook:
    def get_form(self, step=None, data=None, files=None):
        form = super(EventFormWizard, self).get_form(step, data, files)

        # determine the step if not given
        if step is None:
            step = self.steps.current

        if step == "0":
            loan_sessions = self.request.session.get('loan_sessions', None)
            if loan_sessions != None:
                loan_sessions = pickle.loads(self.request.session['loan_sessions'])
            else:
                loan_sessions = []

            loan_choices = []
            for loan_session in loan_sessions:
                loan_choice = (loan_session['number'], loan_session['name'])
                loan_choices.append(loan_choice)

            ##Pass the data when initing the form, which is the POST
            ## data if the got_form function called during a post
            ## or the self.storage.get_step_data(form_key) if the form wizard
            ## is validating this form again in the render_done method
            form = EventForm1(loan_choices=loan_choices, data=data)

        return form


                        
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