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[英]Django populating ChoiceField with attributes from a ForeignKey
[英]Dynamically populating choicefield in Django
我無法在views.py
初始化Choicefield
表單。 我嘗試在__init__
函數中傳遞option
變量,但出現錯誤:
__init__() takes at least 2 arguments (1 given)` coming from the `form = super(SomeeWizard, self).get_form(step, data, files)
表格
class SomeForm(forms.Form):
def __init__(self, choice, *args, **kwargs):
super(SomeForm, self).__init__(*args, **kwargs)
self.fields['choices'] = forms.ChoiceField(choices=[ (o.id, str(o)) for o in choice])
views.py
class SomeWizard(SessionWizardView):
def get_form(self, step=None, data=None, files=None):
form = super(SomeWizard, self).get_form(step, data, files)
if step == "step2":
option = self.get_cleaned_data_for_step("step1")['choice']
choice = Choice.objects.filter(question__text__exact=option)
form = SomeForm(choice)
return form
def get_template_names(self):
return [TEMPLATES[self.steps.current]]
def done(self, form_list, **kargs):
return render_to_response('done.html')
編輯
我試圖哈桑溶液和Django表單向導傳遞{'files': None, 'prefix': 'step2', 'initial': {}, 'data': None}
入**kwarg
在__init__
的功能SomeForm
。
我將內容打印在**kwarg
,得到了:
{'files': None, 'prefix': 'step2', 'initial': {}, 'data': None} {'choices': [<Choice: Blue>, <Choice: Red>]}
嘗試此更改(我評論更改的行):
forms.py
:
class SomeForm(forms.Form):
def __init__(self, *args, **kwargs): #this line changed
choice = kwargs.pop('choice', None) #this line added
self.fields['choices'] = forms.ChoiceField(choices=[ (o.id, str(o)) for o in choice])
super(SomeForm, self).__init__(*args, **kwargs)
views.py
:
class SomeWizard(SessionWizardView):
def get_form(self, step=None, data=None, files=None):
form = super(SomeWizard, self).get_form(step, data, files)
if step == "step2":
option = self.get_cleaned_data_for_step("step1")['choice']
choice = Choice.objects.filter(question__text__exact=option)
form = SomeForm(choice=choice) #this line changed
return form
def get_template_names(self):
return [TEMPLATES[self.steps.current]]
def done(self, form_list, **kargs):
return render_to_response('done.html')
僅供參考,我必須使用data屬性初始化表單才能正常工作。 例如:
class SomeWizard(SessionWizardView):
def get_form(self, step=None, data=None, files=None):
form = super(SomeWizard, self).get_form(step, data, files)
# determine the step if not given
if step is None:
step = self.steps.current
if step == "2":
option = self.get_cleaned_data_for_step("1")['choice']
choice = Choice.objects.filter(question__text__exact=option)
## 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 methodform
form = SomeForm(choice=choice, data=data)
return form
def get_template_names(self):
return [TEMPLATES[self.steps.current]]
def done(self, form_list, **kargs):
return render_to_response('done.html')
否則,在提交表單后,它將返回我的第一個表單。 有關完整說明,請參見此處 。 我正在使用django 1.8。
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