Django：如何使表格有条件？

Question

我有一个包含两个字段的表单。应该只要求用户 select 两者之一。两者都不是，也不是 none。我尝试通过覆盖 Django Doc 中描述的 clean 方法来解决这个问题：

forms.py

class ConfigureWorkout(forms.Form):
    first_exercise = forms.ModelChoiceField(empty_label="select", label="Choose First Exercise", queryset=FirstExercise.objects.all(), required=False) 
    sec_exercise = forms.ModelChoiceField(empty_label="select", label="Choose Sec Exercise", queryset=SecExercise.objects.all(), required=False)

    def clean(self):
        first_exercise = self.cleaned_data.get("first_exercise")
        sec_exercise = self.cleaned_data.get("sec_exercise")

        if first_exercise and sec_exercise:
            raise forms.ValidationError("Enter either a First Exercise or a Secondary Exercise.")
        else:
            return self.cleaned_data

views.py

def configure(request):
    configure_workout = ConfigureWorkout()

    if request.method == "GET":
        return render(request, "userprofile/some.html", configure_workout)

    else:
        return render(request, "app/other.html")

模板

<form action="{% url 'configure' %}" method="POST">
    {% csrf_token %}
    {{ configure_workout }}
    <input type="submit" name="configuration_completed">
</form>

但是，如果我通过 select 对表单中的两个字段进行测试，将不会出现错误 displayed/raised。我成功通过了表格并被发送到“other.html”。

我错过了什么？非常感谢您的帮助:)

Answer 1

您似乎没有将实际数据传递到您的表单。也许这会有所帮助：

def configure(request):
    configure_workout = ConfigureWorkout()

    if request.method == "GET":
        return render(request, "userprofile/some.html", configure_workout)

    else:
        configure_workout = ConfigureWorkout(request.POST)
        configure_workout.is_valid()
        configure_workout.clean()
        return render(request, "app/other.html")

Answer 2

基于@trafalinos 的回答并查看 Forms 上的文档，我建议执行以下操作：

在forms.py中：

class ConfigureWorkout(forms.Form):
    first_exercise = forms.ModelChoiceField(empty_label="select", label="Choose First Exercise", queryset=FirstExercise.objects.all(), required=False) 
    sec_exercise = forms.ModelChoiceField(empty_label="select", label="Choose Sec Exercise", queryset=SecExercise.objects.all(), required=False)

    def clean(self):
        cleaned_data = super().clean()  # compare documentation
        first_exercise = cleaned_data.get("first_exercise")
        sec_exercise = cleaned_data.get("sec_exercise")

        if first_exercise and sec_exercise:
            raise forms.ValidationError("Enter either a First Exercise or a Secondary Exercise.")
        else:
            return self.cleaned_data

并且（感谢 trafalino）在 views.py：

def configure(request):
    if request.method == "GET":
        configure_workout = ConfigureWorkout()
        return render(request, "userprofile/some.html", configure_workout)

    else:
        configure_workout = ConfigureWorkout(request.POST)
        configure_workout.clean()
        return render(request, "app/other.html")

Django：如何使表格有条件？

Django: How to make form conditional?

python

forms

django

validation

conditional-statements