Python 在Django上显示空GET表单而不引发任何错误

我试图在我的项目中设置一个显示搜索表单的主页（使用GET方法）。 问题是，由于默认的请求方法是GET，所以在我加载该页面时，它会引发一个错误。当然，我可以将表单的方法更改为POST，但这不是正确的方法，因此我想知道是否可以设置任何条件来避免此问题，并且仍然能够检查任何错误

我正在开发Django 1.5和Python2.7

如果窗体类：

class Search(forms.Form):
    middleschool = 'MS'
    highschool = 'HS'
    university = 'U'
    blank = '-'

    school_choices = ((middleschool, 'Middle School'),
                      (highschool, 'High school'),
                      (university, 'University'),
                      (blank, 'Not defined'),)

    title = forms.CharField(label='Keyworld')
    subject = forms.ModelChoiceField(queryset=Subject.objects.order_by('?'),
                  required=False, label='Whitch subject you want to search?')
    school = forms.ChoiceField(choices = school_choices, required=False, 
                 label='What level of material are you searching?') 
    price = forms.BooleanField(required=False)

这是相对视图：

def home(request):
    if request.method == 'GET':
        form = Search(request.GET)
        if form.is_valid():
            cd = form.cleaned_data
            ftitle = cd['title']
            fsubject = cd['subject']
            fschool = cd['school']
            fprice = cd['price']
            if fprice:
                forms = File.objects.filter(name__contains='ftitle', subject='fsubject', school='fschool', price = '0,0')
                return render(request, 'search.html', {'form': form})
            else:
                forms = File.objects.filter(name__contains='ftitle', subject='fsubject', school='fschool')
                return render(request, 'search.html', {'form': form})
    else:
        form = Search()
    return render(request, 'home.html', {'form': form})

这是HTML：

{% block content %}
<hr>
<div id='search'>
    {% if form.errors %}
    <p style="color: red;">
        Please correct the error{{ form.errors|pluralize }} below.
    </p>
    {% endif %}

    <form action="/search/" method="get">
        <div class="field">{{ form.title.errors }}<label for="keyworld">Keyworld:</label>{{ form.title }}</div>
        <div class="field"><label for="subject">Subject:</label>{{ form.subject }}</div>
        <div class="field"><label for="school">Level:</label>{{ form.school }}</div>
        <div class="field"><label for="price">Price yes or no:</label>{{ form.price }}</div>
        <input type="submit" value="Search">
        <input type="reset" value="Reset">
    </form>
</div>
<hr>
{% endblock %}

{%block content%}

{%if form.errors%}

请更正下面的错误{form.errors | pluralize}}。

{%endif%}
{{form.title.errors}}Keyworld:{{form.title}}
主题：{form.Subject}
级别：{form.school}
价格是或否：{form.Price}

{%endblock%}

您可以检查request.GET是否为空，而不是检查request方法：

if request.GET:
    form = SearchForm(request.GET)

---

您只需添加

或无
，如下所示：

form = SearchForm(request.GET or None)

它引发了有关需要form.title的错误。