根据查询结果动态添加表单字段

Question

我有一个模型Question，其中包含问题列表。对于查询此表的结果，我想创建一个 CharField。这是我最初的尝试，没有任何错误，但没有显示任何内容：

def __init__(self, **kwargs):
    super(QuestionnaireForm, self).__init__(**kwargs)
    self.fields['questionnaire'] = dict()
    questions = Question.objects.all()
    for question in questions:
        self.fields['questionnaire']['question' + str(question.pk)] = forms.CharField(widget=forms.TextInput(attrs=dict(placeholder=_("Answer"))), label=_(question))

在我的模板中我正在尝试：

<div class="questionnaire">
    <h2>{% trans "Questionnaire" %}</h2>
    {% if form.questionnaire %}
        {% for question in form.questionnaire %}
            <div class="row">
                {% include "core/includes/field.html" with field=question %}
            </div>
        {% endfor %}
    {% endif  %}
</div>

在我的渲染输出中，我只看到：

<div class="questionnaire">
    <h2>Questionnaire</h2>
</div>

如果我在Form.__init__ 中设置它们后运行logger.debug(self.fields['questionnaire'])，我明白了：

DEBUG {'question1': <django.forms.fields.CharField object at 0x7ff76473d550>, 'question3': <django.forms.fields.CharField object at 0x7ff76473d990>, 'question2': <django.forms.fields.CharField object at 0x7ff76473d890>}

Answer 1

在你的视野中试试这个

def myview(request):
    questions = Question.objects.all()
    if request.method == 'POST':

        form = MyForm(request.POST, extra=questions)
        if form.is_valid():
            pass
    else:
        form = MyForm(extra=questions)
        return render(request, "template", { 'form': form}) 

在forms.py中

class MyForm(forms.Form):
    def __init__(self, *args, **kwargs):
        extra = kwargs.pop('extra')
        super(LoginForm, self).__init__(*args, **kwargs)
        for question in extra:
            self.fields['question_%s' % extra.id] =  forms.CharField(widget=forms.TextInput())

使用我们在参数中传递的额外字段来初始化我们的表单

formsets：对于您的情况，您可以定义另一个表单问题：

class QuestionForm(forms.Form):
    question = forms.CharField()

查看：

def myview(request):
    questions_rows = Question.objects.all().count()                      
    QuestionFormSet = formset_factory(QuestionForm,extra=questions_rows)
    if request.method == 'POST':
        myform = LoginForm(request.POST,prefix='myform')
        questions = QuestionFormSet(request.POST,prefix='question')

        if myform.is_valid() and questions.is_valid():
            pass
    else:
        myform = LoginForm(prefix='myform')
        questions = QuestionFormSet(prefix='question')
        return render(request, "template", { 'myform': myform,'questions':questions}) 

您可以看到我们使用多个表单（myform 简单表单和问题是动态添加问题字段的表单集）您可以查看formsets