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这与此非常相关： How to access data when form.is_valid() is false

就我而言，如果表单验证失败，我希望用户查看带有错误消息的同一页面，并让它显示新的和修改后的 clean_data 评论。现在，如果它未能通过表单验证，它将显示带有旧用户提交评论的页面。我之所以要显示修改后的评论，是因为我希望新数据与错误消息匹配。例如，如果用户提交

'            hey             bye                  '

为了绕过 20 个字符的最小限制，我的清理功能将去除空格并将其修剪为

'hey bye'

然后验证失败。错误消息将显示“评论长度需要至少 20 个字符”。使用旧数据，用户会感到困惑，因为他实际上输入了20多个字符，并且旧数据会显示出来。我希望他们看到被剥离的评论，这样他们就会知道我为什么失败了。

这是我的代码...

视图.py

def question(request, qid):
    quest = shortcuts.get_object_or_404(askbox.models.Question, pk=qid)
    log.info("Question #{0}: {1}".format(qid, quest))
    user = SessionManager.getLoggedInUser(request)
    answerForm = AnswerForm()

    if request.method == "POST":
        if user == None:
            return HttpResponseRedirect(reverse('login.views.login'))
        answerForm = AnswerForm(request.POST)
        if answerForm.is_valid():
            # user posted an answer
            answerForm.question = quest
            answerForm.user = user
            answerForm.save()
            return HttpResponseRedirect(reverse('question.views.question', args=(quest.id,)))
        else:
            #answerForm.text = answerForm.saved_data['text'] #doesn't work too
            answerForm.text = "foo" # doesn't work...
    else: # GET request
        # landing page
        # probably do nothing
        pass
    print "AnswerForm: {0}".format(answerForm)
    mediaList = askbox.models.Media.objects.filter(question=qid)
    return shortcuts.render_to_response('question/question.html', {
        'title': 'Groupthink | {0}'.format(quest.question),
        'css_list': css_list,
        'js_list': js_list,
        'question': quest,
        'mediaList': mediaList,
        'user': user,
        'answerForm': answerForm,
    }, context_instance=RequestContext(request))

表格.py

# fake abstract class... 
class AbstractCommentForm(forms.ModelForm):
    text = forms.CharField(min_length=MIN_ANSWER_LEN, max_length=MAX_ANSWER_LEN, widget=forms.Textarea) # the comment text

    def clean_text(self):
        # we want to avoid user cheating the system. We'll trim extra spaces between characters and then strip spaces at both ends of the string
        field = 'text'
        self.cleaned_data[field] = (re.sub(r'  +', ' ', self.cleaned_data[field])).strip()
        self.text = self.cleaned_data[field] # doesn't work
        text_len = len(self.cleaned_data[field])
        self.saved_data = self.cleaned_data # doesn't work
        if text_len < MIN_ANSWER_LEN:
            raise forms.ValidationError("The comment length needs to be at least {0} characters long".format(MIN_ANSWER_LEN))
        if text_len > MAX_ANSWER_LEN:
            raise forms.ValidationError("The comment length exceeds the maximum {0} characters".format(MAX_ANSWER_LEN))
        return self.cleaned_data[field]


class CommentForm(AbstractCommentForm):
    class Meta:
        model = Comment


class AnswerForm(AbstractCommentForm):
    class Meta:
        model = Answer
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