django mutlipleChoiceField如何驗證？

Question

我有以下表格：

forms.py：

class enrolForm(forms.Form): 
    CHOICES = [('male','male'),('female','female')] 
    students = forms.MultipleChoiceField(choices = CHOICES) 

views.py：

form = enrolForm(request.POST) 
if form.is_valid(): 
      print "creating student" 
      exam = models.Exam.objects.get(name=examName) 
      . 
      .#more code ....... 

而不會繼續（print "creating student"），形式是永遠有效。這是爲什麼 ？ 如何驗證這樣的形式
請幫助

編輯： 它說，在form.errors：<ul class = "errorlist"><li> students<ul class="errorlist"><li>This field is required.</li></ul></li></ul><br> 編輯：

views.py：

def enrol(request,examName): 
    print "EXAm naaame" 
    form = enrolForm() 
    allStudents = models.User.objects.filter(groups__name="students") 
    myList = [] 

    for i in allStudents: 
     myList.append((i,i)) 


    print allStudents,'33333333333333333333' 

    form.fields['students'].choices = myList 


    if request.method == 'POST': 
     form = enrolForm(request.POST) 

     if form.is_valid(): 
      exam = models.Exam.objects.get(name=examName) 
      for i in form.cleaned_data['students']: 

       user= models.User.objects.get(username=i) 
       exam = models.Exam.objects.get(name= examName)     
       models.Exam_Student.objects.create(user,exam) 

      return render_to_response('enrol.html',RequestContext(request,{'form':form})) 

    variables = RequestContext(request,{'form':form}) 
    return render_to_response("enrol.html",variables) 

Answer 1

這有什麼錯用一個標準的ChoiceField？

class enrolForm(forms.Form): 
    CHOICES = [('male','male'),('female','female')] 
    students = forms.ChoiceField(choices = CHOICES) 

而且這樣做是爲了查看錯誤，並讓我們知道將是有益的：因爲需要students場

if form.is_valid(): 
    print "creating student" 
    exam = models.Exam.objects.get(name=examName) 
    ... 
else: 
    print 'ERRORS:', form.errors 

Answer 2

您的形式是無效的。這意味着您必須選擇一個學生才能使is_valid()爲真。

編輯：對於一些奇怪的原因，我不能在我的意見添加新線，所以我加入這個在這裏...

出於測試目的，去除一切，但要領，看看是什麼發生：

def enrol(request): 
    if request.method == 'POST': 
     form = enrolForm(request.POST) 
     if form.is_valid(): 
      print 'Valid form' 
     else: 
      print form 
    else: 
     form = enrolForm() 

    return render_to_response('enrol.html', {'form' : form}, context_instance=RequestContext(request))