我有一个搜索表单，我想验证输入'seach_word'至少有4个字母。我在尝试验证表单时收到此错误
必须先呈现响应内容，然后才能进行迭代。
#views.py
class SearchFormView(FormView):
form_class = PostSearchForm
template_name = 'lineup/post_search.html'
def form_valid(self, form):
schWord = form.cleaned_data['search_word']
search_type = form.cleaned_data['search_type']
context = {}
if search_type == 'store':
post_list = Store.objects.filter(
Q(cie_name__icontains=schWord)).distinct()
context['object_type'] = 'store'
context['object_list'] = post_list
if search_type == 'city':
post_list = Address.objects.filter(
Q(city__icontains=schWord)).distinct()
context['object_type'] = 'city'
context['object_list'] = post_list
context['form'] = form
context['search_term'] = schWord
return render(self.request, self.template_name, context)
def form_invalid(self, form):
schWord = form.cleaned_data['search_word']
messages.add_message(
self.request, messages.WARNING, _('Please correct this...'))
context = super(SearchFormView, self).form_invalid(form)
return render(self.request, self.template_name, context)
forms.py的内容
#forms.py
class PostSearchForm(forms.Form):
SEARCH_TYPE_CHOICES = (
('city', 'city'),
('store', 'store'),
('product', 'product'),
)
search_type = forms.ChoiceField(choices=SEARCH_TYPE_CHOICES, required=True)
search_word = forms.CharField(label='Search Word',
validators=[MinLengthValidator(4)], required=True)
'''
def clean_search_word(self):
cd = self.cleaned_data
if len(cd['search_word']) < 4:
raise forms.ValidationError('too short.')
return cd['search_word']
'''
def __init__(self, *args, **kwargs):
self.helper = FormHelper()
self.helper.form_tag = False
self.helper.layout = Layout(
Fieldset(
'',
Field('search_type', css_class='span6'),
Field('search_word', css_class='span6'),
),
FormActions(
Submit('submit', 'Go', css_class='btn btn-primary')
)
)
super(PostSearchForm, self).__init__(*args, **kwargs)
tracenack
Environment:
Request Method: POST
Request URL: http://localhost:8000/search/
Django Version: 1.10.3
Python Version: 3.5.2
Installed Applications:
['grappelli',
'django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'django.contrib.sites',
'debug_toolbar',
'stripe',
'vote',
'django_messages',
'pinax.notifications',
'admin_honeypot',
'easy_thumbnails',
'django_extensions',
'crispy_forms',
'datetimewidget',
'lineup',
'allauth',
'allauth.account',
'allauth.socialaccount']
Installed Middleware:
['django.middleware.security.SecurityMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.common.CommonMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware',
'django.middleware.clickjacking.XFrameOptionsMiddleware',
'debug_toolbar.middleware.DebugToolbarMiddleware',
'django.middleware.locale.LocaleMiddleware']
File "/home/laptopguy/Documents/lineupNovember/python3env/lib/python3.5/site-packages/django/core/handlers/exception.py" in inner
39. response = get_response(request)
File "/home/laptopguy/Documents/lineupNovember/python3env/lib/python3.5/site-packages/django/core/handlers/base.py" in _get_response
187. response = self.process_exception_by_middleware(e, request)
File "/home/laptopguy/Documents/lineupNovember/python3env/lib/python3.5/site-packages/django/core/handlers/base.py" in _get_response
185. response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/home/laptopguy/Documents/lineupNovember/python3env/lib/python3.5/site-packages/django/views/generic/base.py" in view
68. return self.dispatch(request, *args, **kwargs)
File "/home/laptopguy/Documents/lineupNovember/python3env/lib/python3.5/site-packages/django/views/generic/base.py" in dispatch
88. return handler(request, *args, **kwargs)
File "/home/laptopguy/Documents/lineupNovember/python3env/lib/python3.5/site-packages/django/views/generic/edit.py" in post
185. return self.form_invalid(form)
File "/home/laptopguy/Documents/lineupNovember/lineup/views.py" in form_invalid
58. return render(self.request, self.template_name, context)
File "/home/laptopguy/Documents/lineupNovember/python3env/lib/python3.5/site-packages/django/shortcuts.py" in render
30. content = loader.render_to_string(template_name, context, request, using=using)
File "/home/laptopguy/Documents/lineupNovember/python3env/lib/python3.5/site-packages/django/template/loader.py" in render_to_string
68. return template.render(context, request)
File "/home/laptopguy/Documents/lineupNovember/python3env/lib/python3.5/site-packages/django/template/backends/django.py" in render
64. context = make_context(context, request, autoescape=self.backend.engine.autoescape)
File "/home/laptopguy/Documents/lineupNovember/python3env/lib/python3.5/site-packages/django/template/context.py" in make_context
267. context.push(original_context)
File "/home/laptopguy/Documents/lineupNovember/python3env/lib/python3.5/site-packages/django/template/context.py" in push
59. return ContextDict(self, *dicts, **kwargs)
File "/home/laptopguy/Documents/lineupNovember/python3env/lib/python3.5/site-packages/django/template/context.py" in __init__
18. super(ContextDict, self).__init__(*args, **kwargs)
File "/home/laptopguy/Documents/lineupNovember/python3env/lib/python3.5/site-packages/django/template/response.py" in __iter__
123. 'The response content must be rendered before it can be iterated over.'
Exception Type: ContentNotRenderedError at /search/
Exception Value: The response content must be rendered before it can be iterated over.
答案 0 :(得分：2)
回溯显示您的问题出在form_invalid方法中。您正在将超类调用的结果捕获为context，并将其传递给render函数。但是超类方法返回响应，而不是上下文 - 它已经为你渲染了模板，你只需要返回它。
def form_invalid(self, form):
schWord = form.cleaned_data['search_word']
messages.add_message(
self.request, messages.WARNING, _('Please correct this...'))
return super(SearchFormView, self).form_invalid(form)