django - 跳过步骤 x 到步骤 y 并验证步骤 x 数据

Question

我在 django 向导表单上遇到了一个大问题。

我有 3 个步骤。第二步可以包含数据，也可以不包含数据。最后一步是文件上传步骤。

在 WizardForm 类中，我覆盖了 get_context_data 方法并将其包含在其中:

if self.steps.current == 'against_indication':
        questions = None
        try:
            # get the machine
            machine_id = self.kwargs['pk']
            machine = Machine.objects.get(pk=int(machine_id))
            # check if there is against indications
            if machine.type_question is False:
                questions = YhappsQuestion.objects.filter(type_modalite=machine.type)
            else:
                questions = CustomQuestion.objects.filter(machine=machine)
        except Machine.DoesNotExist:
                pass
        if len(questions) == 0:
            # we modify the form wizard to skip against indication step
            self.render_next_step(form, **kwargs)
            #self.render_goto_step(step='against_indication', goto_step='prescription', **kwargs)

如您所见，如果没有问题，我将跳过第二步(against_indication)进入下一步(prescription)。

问题出现在这里。呈现最后一步时，向导表单中没有足够的数据。在 ddt 的请求中有它: with skip step .因此，如果我上传文件，它将填充 against_indication 数据而不是处方数据，并重新呈现最后一步...

我尝试在不跳过第二步的情况下完成所有这些操作，并查看 ddt 的请求: without skip step .

有人有解决方案可以在我跳过步骤时获得正确的数据，请问？

感谢您的进一步回答

Answer 1

我不认为 get_context_data 是执行此操作的正确方法； FormWizard 是一个非常具体的类，它限制了您可以执行不同功能的位置。

指定 FormWizard 何时跳过步骤的典型方法是使用 condition_dictionary。当条件(设置为可调用项)返回 True 时，Django 使用该结构仅包含步骤的表单。如果不是，则该步骤的表单不会强制调用 form.is_valid()，绕过该步骤的验证。这也确保为每个步骤创建表单的所有隐藏管理信息。

这是一个如何工作的例子:

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


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

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 == some_condition:
        return True # show step 2
    else: return False # or don't

''' urls.py '''

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

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