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我有一个带有自定义构造函数的模型表单。它检查是否需要文件，如果为假，则删除文件字段。它还有两个隐藏字段，我在视图中对其进行了初始化。表单类如下：

class SubmitTask(forms.ModelForm):
    task = forms.ModelChoiceField(queryset=Task.objects.all(), widget=forms.HiddenInput())
    student = forms.ModelChoiceField(queryset=UserProfile.objects.all(), widget=forms.HiddenInput())    

    def __init__(self, file_required=False, *args, **kwargs):
            super(SubmitTask, self).__init__(*args, **kwargs)
            if file_required is True:
                    file = forms.FileField(
                            label='Select a file',
                            help_text='max: 2.5 MB'
                    )
            else:
                    del self.fields['file']

    class Meta:
            model = Submission
            exclude = ('date_submitted',)

我的问题是在我初始化表单时填充了隐藏字段（我已经确认它的值确实是通过查看 HTML 代码初始化的）。但是，在 POST 请求期间不会填充隐藏字段的值。我在 POST 请求期间确认表单确实已绑定，并且我还在 Firebug 上确认 POST 还包含taskandstudent值。这是我的相关方法views.py

def view_task(request, id):
    task = Task.objects.get(pk=id)
    profile = request.user.get_profile()

    data = {}
    data['classroom'] = task.get_classroom()
    data['description'] = task.get_description()

    teacher_classrooms = Classroom.objects.filter(teacher=profile)
    teacher_tasks = Task.objects.filter(classroom__in=teacher_classrooms)

    if not submission and task not in teacher_tasks:
        form = SubmitTask(file_required=task.file_required, initial={'task':task.pk, 'student':profile.pk})

        data['form'] = form
        if request.method == 'POST':
            form = SubmitTask(request.POST, request.FILES)

            if form.is_valid():
                form.save()

    return render_to_response('classrooms/view_task.html',
        data, context_instance=RequestContext(request))
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1 回答 1

1

您的视图功能对我来说看起来不正确：

提交变量来自哪里，在初始化发布的表单时，您缺少 file_required 参数，并且表单处理可能应该重新组织为：

if request.method == 'POST':
    form = SubmitTask(task.file_required, request.POST, request.FILES)
    ...
else:
    form = SubmitTask(task.file_required, ...)

data['form'] = form
于 2012-11-21T18:45:42.407 回答