Django:如何将参数传递给表单

Question

我有一个使用 bootstrap3 呈现的 Django 表单。我希望能够将参数传递到我的表单中以使其更加通用。我的表单如下所示:

class SpacecraftID(forms.Form):
  def __init__(self,*args,**kwargs):
    choices = kwargs.pop('choices')
    #self.choices = kwargs.pop('choices') produces same error
    super(SpacecraftID,self).__init__(*args,**kwargs)

  scID = forms.MultipleChoiceField(required=False, widget=forms.CheckboxSelectMultiple, choices=choices)

我的观点如下:

def schedule_search(request):
 choices = (
    ('1','SAT1'),
    ('2','SAT2'),
    ('3','SAT3'),
    )

 if request.method == 'POST':
    form_ID = SpacecraftID(request.POST,choices=choices)
    if form.is_valid():
        scID = form_ID.cleaned_data['scID']

 else:
    form_ID = SpacecraftID(choices=choices)

 return render(request, 'InterfaceApp/schedule_search.html', {'form3': form_ID})

当我运行此代码时，出现错误:

名称错误位于/InterfaceApp/schedule_search/， 名称“选择”未定义

Answer 1

问题在于，当您定义表单字段时，choices变量不可用，即当Python解析forms.py文件时，它仅在以下情况下可用:表单在 __init__ 内实例化。然后，您需要更新 __init__ 内的字段。

class SpacecraftID(forms.Form):
    def __init__(self,*args,**kwargs):
        choices = kwargs.pop('choices')

        super(SpacecraftID,self).__init__(*args,**kwargs)

        # Set choices from argument.
        self.fields['scId'].choices = choices

    # Set choices to an empty list as it is a required argument.
    scID = forms.MultipleChoiceField(required=False, widget=forms.CheckboxSelectMultiple, choices=[])