Django表单向导使用条件逻辑跳过多个步骤

Django的表单向导（即SessionWizardView）中是否有跳过多个步骤的方法

我知道可以使用条件dict生成以下表单显示逻辑： 第1页->第3页

#urls.py 
path('main/', MyWizard.as_view(set_of_forms, condition_dict={'1': view_condition} ))

我想做的是： 第1页-->第4页

大概，根据第1页的内容添加一个条件dict应该可以跳过第3页，但它不起作用。例如：

#urls.py 
path('main/', MyWizard.as_view(set_of_forms, condition_dict={'1': view_condition, '2': view_condition2,} ))

---

我真的被弄糊涂了，不知道该如何破解这个坚果。非常感谢您提供的任何指导。

指定FormWizard何时跳过步骤的典型方法是使用条件字典。Django使用该结构仅在条件（设置为callables）满足时包含步骤的表单

---

保罗，谢谢你的回答！这正是轻松跳过表单页面所需要的。根据Paulo的回答，需要进行三个更改以同时跳过多个步骤：

# I always specify index values for steps so that all functions can share them
STEP_ONE = u'0'
STEP_TWO = u'1'
STEP_THREE = u'2'


def MyWizard(SessionWizardView):
    # Your form wizard itself; will not be called directly by urls.py, but rather wrapped in a function that provide the condition_dictionary

    # **Change1**: functions need to be stated before the dictionary
    def return_true(wizard): #  callable function called in _condition_dict
        return True # a condition that is always True, for when you always want form seen

    # **Change 2:** Only proceed with the logic if the step is valid
    def check_step_two(wizard): #  callable function called in _condition_dict
        step_1_info = wizard.get_cleaned_data_for_step(STEP_ONE)
        # do something with info; can retrieve for any prior steps
        if step_1_info != None:
            if step_1_info == some_condition:
                return True # show step 2
            else: return False # or don't

     # **Change 3**: a condition must be added to skip an additional form
    _condition_dict = { # a dictionary with key=step, value=callable function that return True to show step and False to not
        STEP_ONE: return_true, # callable function that says to always show this step
        STEP_TWO: check_step_two, # conditional callable for verifying whether to show step two
        STEP_THREE: check_step_two, # conditional callable for verifying whether to show step three
        STEP_FOUR: return_true, # callable function that says to always show this step
    }
    _form_list = [ # a list of forms used per step
        (STEP_ONE,your_forms.StepOneForm),
        (STEP_TWO, your_forms.StepTwoForm),
        (STEP_THREE, your_forms.StepThreeForm),
        (STEP_THREE, your_forms.StepFourForm),
    ]
    ...

''' urls.py '''

your_form_wizard = MyWizard.as_view(MyWizard._form_list,condition_dict= MyWizard._condition_dict)

urlpatterns = patterns('',
    ...
    url(r'^form_wizard_url/$', your_form_wizard, name='my-form-wizard',) 
)

---

谢谢你，@PauloRodrigues！你的回答很清楚，也很有帮助。我已经重新发布了你的答案，其中有一些小改动，说明了如何跳过多个步骤。

# I always specify index values for steps so that all functions can share them
STEP_ONE = u'0'
STEP_TWO = u'1'
STEP_THREE = u'2'


def MyWizard(SessionWizardView):
    # Your form wizard itself; will not be called directly by urls.py, but rather wrapped in a function that provide the condition_dictionary

    # **Change1**: functions need to be stated before the dictionary
    def return_true(wizard): #  callable function called in _condition_dict
        return True # a condition that is always True, for when you always want form seen

    # **Change 2:** Only proceed with the logic if the step is valid
    def check_step_two(wizard): #  callable function called in _condition_dict
        step_1_info = wizard.get_cleaned_data_for_step(STEP_ONE)
        # do something with info; can retrieve for any prior steps
        if step_1_info != None:
            if step_1_info == some_condition:
                return True # show step 2
            else: return False # or don't

     # **Change 3**: a condition must be added to skip an additional form
    _condition_dict = { # a dictionary with key=step, value=callable function that return True to show step and False to not
        STEP_ONE: return_true, # callable function that says to always show this step
        STEP_TWO: check_step_two, # conditional callable for verifying whether to show step two
        STEP_THREE: check_step_two, # conditional callable for verifying whether to show step three
        STEP_FOUR: return_true, # callable function that says to always show this step
    }
    _form_list = [ # a list of forms used per step
        (STEP_ONE,your_forms.StepOneForm),
        (STEP_TWO, your_forms.StepTwoForm),
        (STEP_THREE, your_forms.StepThreeForm),
        (STEP_THREE, your_forms.StepFourForm),
    ]
    ...

''' urls.py '''

your_form_wizard = MyWizard.as_view(MyWizard._form_list,condition_dict= MyWizard._condition_dict)

urlpatterns = patterns('',
    ...
    url(r'^form_wizard_url/$', your_form_wizard, name='my-form-wizard',) 
)