基于 Django 表单的视图 GET 响应

Question

为了在网站主页上创建一个表单，我创建了一个表单 class 和一个请求 class。不知何故，我无法在 url 查询字符串中获得响应。

有人可以帮我解决这个问题吗？

views.py

def index(request):
    if request.method == 'GET':
        form = CurrencyConverterForm(request.GET)
        if form.is_valid():
            base_currency = form.data.__getitem__('base_currency')
            counter_currency = form.data.__getitem__('counter_currency')
            base_amount = form.data.__getitem__('base_amount')

        counter_amount = get_conversion_amount(base_currency, counter_currency, datetime.now(), base_amount)

        response = HttpResponseRedirect('/')
        response['base_currency'] = base_currency
        response['counter_currency'] = counter_currency
        response['base_amount'] = base_amount

        return response
else:
    form = CurrencyConverterForm()

context = {'form': form}

return render(request, '../templates/client/index.html', context)

forms.py

class CurrencyConverterForm(forms.Form):
    base_currency = forms.ModelChoiceField(queryset=Currency.objects.all(), required=True)
    counter_currency = forms.ModelChoiceField(queryset=Currency.objects.all(), required=True)
    base_amount = forms.FloatField(required=True)

urls.py

urlpatterns = [
    url(r'^$', views.index),
    url(r'^admin/', admin.site.urls),

]

index.html

<form action="" method="get">
    {{ form.as_ul }}
    <input type="submit" value="Convert"/>
</form>

Answer 1

您需要像这样访问表单数据：

data = form.cleaned_data['data']

因此您的视图必须如下所示：

def index(request):
    if request.method == 'GET':
        form = CurrencyConverterForm(request.GET)
        if form.is_valid():
            base_currency = form.cleaned_data['base_currency']
            counter_currency = form.cleaned_data['counter_currency']
            base_amount = form.cleaned_data['base_amount']

        counter_amount = get_conversion_amount(base_currency, counter_currency, datetime.now(), base_amount)

        response = HttpResponseRedirect('/')
        response['base_currency'] = base_currency
        response['counter_currency'] = counter_currency
        response['base_amount'] = base_amount

        return response
else:
    form = CurrencyConverterForm()

context = {'form': form}

return render(request, '../templates/client/index.html', context)

Answer 2

我已经解决了。

实际上我需要的代码比我预期的要少得多。

def index(request):
    counter_amount = ""
    if request.method == 'GET':
        form = CurrencyConverterForm(request.GET)
        if form.is_valid():
            form_base_currency = form.cleaned_data['form_base_currency']
            form_counter_currency = form.cleaned_data['form_counter_currency']
            form_base_amount = form.cleaned_data['form_base_amount']

            # Calculate the counter_amount
            counter_amount = get_conversion_amount(form_base_currency, form_counter_currency, datetime.now(),
                                                   form_base_amount)
            # Retrieve the counter amount from the dict
            counter_amount = counter_amount['GetConversionAmountResult']
            # Maximize the number of decimals to 4
            if counter_amount.as_tuple().exponent < -4:
                counter_amount = "%.4f" % counter_amount

    else:
        form = CurrencyConverterForm()

    context = {
        'form': form,
        'counter_amount': counter_amount
    }

    return render(request, '../templates/client/index.html', context)

基于 Django 表单的视图 GET 响应

Django form based view GET response

python

django

django-forms

django-views