Django错误：预期的字符串或缓冲区
当我提交Django表单时，我收到了Django错误：expected string or buffer。我已经根据同样的问题阅读了一些SO问题，但它似乎没有用。
这是我的models.py表格：
class BirthCertificate(models.Model):
lastname = models.CharField(max_length=30, null=False, verbose_name='Nom de famille')
firstname = models.CharField(max_length=30, null=False, verbose_name='Prénom(s)')
sex = models.CharField(max_length=8, choices=SEX_CHOICES, verbose_name='Sexe')
birthday = models.DateField(null=False, verbose_name='Date de naissance')
birthhour = models.TimeField(null=True, verbose_name='Heure de naissance')
birthcity = models.CharField(max_length=30, null=False, verbose_name='Ville de naissance')
birthcountry = CountryField(blank_label='Sélectionner un pays', verbose_name='Pays de naissance')
fk_parent1 = models.ForeignKey(Person, related_name='ID_Parent1', verbose_name='ID parent1', null=False)
fk_parent2 = models.ForeignKey(Person, related_name='ID_Parent2', verbose_name='ID parent2', null=False)
mairie = models.CharField(max_length=30, null=False, verbose_name='Mairie')
social_number = models.CharField(max_length=30, null=True, verbose_name='numero social', unique=True)
created = models.DateTimeField(auto_now_add=True)
这是我的forms.py:
class BirthCertificateForm2(forms.ModelForm):
fk_parent1 = CustomLabelModelChoiceField(Person.objects.filter(), required=False, label = "Père", label_func=lambda obj: '%s %s %s' % (obj.lastname, obj.firstname, obj.social_number), empty_label=None)
fk_parent2 = CustomLabelModelChoiceField(Person.objects.filter(), required=False, label = "Mère", label_func=lambda obj: '%s %s %s' % (obj.lastname, obj.firstname, obj.social_number), empty_label=None)
lastname = CustomLabelModelChoiceField(Person.objects.filter(), required=False, label = "Nom", label_func=lambda obj: '%s' % (obj.lastname), empty_label=None)
firstname = CustomLabelModelChoiceField(Person.objects.filter(), required=False, label = "Prénom", label_func=lambda obj: '%s' % (obj.firstname), empty_label=None)
birthday = CustomLabelModelChoiceField(Person.objects.filter(), required=False, label = "Date de Naissance", label_func=lambda obj: '%s' % (obj.birthday), empty_label=None)
birthcity = CustomLabelModelChoiceField(Person.objects.filter(), required=False, label = "Ville de Naissance", label_func=lambda obj: '%s' % (obj.birthcity), empty_label=None)
sex = CustomLabelModelChoiceField(Person.objects.filter(), required=False, label = "Sexe", label_func=lambda obj: '%s' % (obj.sex), empty_label=None)
birthcountry = CustomLabelModelChoiceField(Person.objects.filter(), required=False, label = "Pays de Naissance", label_func=lambda obj: '%s' % (obj.birthcountry), empty_label=None)
mairie = forms.CharField(widget=forms.HiddenInput(), initial=Mairie.objects.get(id=1).city.encode('utf-8'))
social_number = forms.CharField(widget=forms.HiddenInput(),required=False)
class Meta :
model = BirthCertificate
fields = ['lastname', 'firstname', 'sex', 'birthday', 'birthhour', 'birthcity', 'birthcountry','fk_parent1', 'fk_parent2', 'mairie', 'social_number']
widgets = {'country': CountrySelectWidget()}
def __init__(self, *args, **kwargs):
super(BirthCertificateForm2, self).__init__(*args, **kwargs)
for key, value in self.fields.iteritems() :
self.fields[key].widget.attrs.update({'class':'form-fields'})
最后我在views.py中的功能：
def BirthCertificate_Form_unique_number(request) :
#User fill some fields
query_social_number = request.GET.get('social_number')
query_social_number_father = request.GET.get('social_number_father')
query_social_number_mother = request.GET.get('social_number_mother')
if request.method == 'POST':
form = BirthCertificateForm2(request.POST or None)
if form.is_valid() : # Vérification sur la validité des données
post = form.save()
return HttpResponseRedirect(reverse('BC_treated', kwargs={'id': post.id}))
else:
form = BirthCertificateForm2()
parent1 = Person.objects.filter(social_number=query_social_number_father)
parent2 = Person.objects.filter(social_number=query_social_number_mother)
individu = Person.objects.filter(social_number=query_social_number)
form = BirthCertificateForm2(request.POST or None)
form.fields['fk_parent1'].queryset = parent1
form.fields['fk_parent2'].queryset = parent2
form.fields['lastname'].queryset = individu
form.fields['firstname'].queryset = individu
form.fields['birthday'].queryset = individu
form.fields['birthcity'].queryset = individu
form.fields['birthcountry'].queryset = individu
form.fields['sex'].queryset = individu
form.fields['social_number'].queryset = individu
print request.POST
context = {
"form" : form,
}
return render(request, 'BC_form2.html', context)
我的功能允许最初使用来自其他模型的数据填充我的BirthCertificate表单。
但是当我提交表单时，我收到标题错误。
这是追溯：
Environment:
Request Method: POST
Request URL: http://localhost:8000/BirthCertificate/formulaire2?social_number=1+87+10+STRASBOURG+-+583403&social_number_father=1+99+12+BREST+-+765533&social_number_mother=1+87+10+STRASBOURG+-+583403
Django Version: 1.10.3
Python Version: 2.7.12
Installed Applications:
['django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'BirthCertificate',
'Identity',
'bootstrapform',
'Accueil',
'django_countries',
'log',
'Mairie',
'Table',
'Recensement',
'Configurations',
'debug_toolbar',
'chartit',
'Mariage']
Installed Middleware:
['django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.locale.LocaleMiddleware',
'django.middleware.common.CommonMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.middleware.gzip.GZipMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware',
'django.middleware.clickjacking.XFrameOptionsMiddleware',
'django.middleware.security.SecurityMiddleware',
'debug_toolbar.middleware.DebugToolbarMiddleware']
Traceback:
File "/usr/local/lib/python2.7/site-packages/django/core/handlers/exception.py" in inner
39. response = get_response(request)
File "/usr/local/lib/python2.7/site-packages/django/core/handlers/base.py" in _legacy_get_response
249. response = self._get_response(request)
File "/usr/local/lib/python2.7/site-packages/django/core/handlers/base.py" in _get_response
187. response = self.process_exception_by_middleware(e, request)
File "/usr/local/lib/python2.7/site-packages/django/core/handlers/base.py" in _get_response
185. response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/Users/valentinjungbluth/Desktop/Django/Etat_civil/BirthCertificate/views.py" in BirthCertificate_Form_unique_number
81. if form.is_valid() : # Vérification sur la validité des données
File "/usr/local/lib/python2.7/site-packages/django/forms/forms.py" in is_valid
169. return self.is_bound and not self.errors
File "/usr/local/lib/python2.7/site-packages/django/forms/forms.py" in errors
161. self.full_clean()
File "/usr/local/lib/python2.7/site-packages/django/forms/forms.py" in full_clean
372. self._post_clean()
File "/usr/local/lib/python2.7/site-packages/django/forms/models.py" in _post_clean
398. self.instance.full_clean(exclude=exclude, validate_unique=False)
File "/usr/local/lib/python2.7/site-packages/django/db/models/base.py" in full_clean
1210. self.clean_fields(exclude=exclude)
File "/usr/local/lib/python2.7/site-packages/django/db/models/base.py" in clean_fields
1252. setattr(self, f.attname, f.clean(raw_value, self))
File "/usr/local/lib/python2.7/site-packages/django/db/models/fields/__init__.py" in clean
590. value = self.to_python(value)
File "/usr/local/lib/python2.7/site-packages/django/db/models/fields/__init__.py" in to_python
1237. parsed = parse_date(value)
File "/usr/local/lib/python2.7/site-packages/django/utils/dateparse.py" in parse_date
60. match = date_re.match(value)
Exception Type: TypeError at /BirthCertificate/formulaire2
Exception Value: expected string or buffer
编辑：
我的CustomLabelModelChoiceField类如下所示：
class CustomLabelModelChoiceField(forms.ModelChoiceField):
def __init__(self, *args, **kwargs):
self._label_from_instance = kwargs.pop('label_func', force_text)
super(CustomLabelModelChoiceField, self).__init__(*args, **kwargs)
def label_from_instance(self, obj):
return self._label_from_instance(obj)
我的html文件：
{% extends 'Base_BirthCertificate_Naissance.html' %}
{% load staticfiles %}
{% block title %}
<h3> <span class="glyphicon glyphicon-file"></span>Acte de Naissance à partir d'un numéro unique</align> </h3>
{% endblock %}
{% block content %}
<style>
form > input {
width:20%;
}
form {
list-style: none;
}
</style>
<!-- ############### -->
<!-- Page principale -->
<!-- ############### -->
<form class = "form" method="GET" action="">
<h4> Numéro unique de l'individu : </h4>
<input type="text" name="social_number" placeholder="N° unique de l'individu" value="{{request.GET.social_number}}">
<h4> Nom de famille du père et de la mère : </h4>
<input type="text" name="social_number_father" placeholder="N° unique du père" value="{{ request.GET.social_number_father }}">
<input type="text" name="social_number_mother" placeholder="N° unique de la mère" value="{{ request.GET.social_number_mother }}">
<input class="button" type="submit" value="Valider">
<br></br>
</form>
<form class = "form" method='POST' action=''> {% csrf_token %}
<br></br>
{{ form.as_p}} <!-- Display child part formulary -->
{{ value|date:"%d/%m/%Y" }}
<br></br>
<input class="button" type ="submit" value="Valider l'acte de naissance" />
</form>
{% endblock content %}
编辑2：
我从POST数据简历中拍照，这可能是对我的错误expected string or buffer的解释！我有int，我不知道为什么
2 个答案:
答案 0 :(得分：1)
您调用POST方法，检索参数，就好像它们位于GET方法中一样。
但即使在您调用POST方法后，您的request.POST也是空的。
你的form.is_valid()抛出了你得到的错误，这意味着你正在调用POST方法。您需要调试POST为空的原因。
向我们展示您形成请求的代码。
更新：
是的，您没有正确形成POST方法。
Request URL: http://localhost:8000/BirthCertificate/formulaire2?social_number=1+87+10+STRASBOURG+-+583403&social_number_father=1+99+12+BREST+-+765533&social_number_mother=1+87+10+STRASBOURG+-+583403
这告诉您在GET方式中以querystring方式传递参数，而在POST中传递参数在body中。
更新2 ：
您需要在html表单中指定action=/formulaire2/或action=/BirthCertificate/formulaire2/
答案 1 :(得分：1)
我找到了答案：问题出在我的forms.py文件中。在我的模型中，我有birthday这是一个DateField，在我的表单中它是一个Person ForeignKey ..
所以我必须写：
我的表格/ py文件：
class BirthCertificateForm2(forms.ModelForm):
fk_parent1 = CustomLabelModelChoiceField(Person.objects.filter(), required=False, label = "Père", label_func=lambda obj: '%s %s %s' % (obj.lastname, obj.firstname, obj.social_number), empty_label=None)
fk_parent2 = CustomLabelModelChoiceField(Person.objects.filter(), required=False, label = "Mère", label_func=lambda obj: '%s %s %s' % (obj.lastname, obj.firstname, obj.social_number), empty_label=None)
sex = forms.CharField(required=False, label = "Sexe")
birthcountry = forms.CharField(required=False, label = "Pays de Naissance")
mairie = forms.CharField(widget=forms.HiddenInput(), initial=Mairie.objects.get(id=1).city.encode('utf-8'))
class Meta :
model = BirthCertificate
fields = ['lastname', 'firstname', 'sex', 'birthday', 'birthhour', 'birthcity', 'birthcountry','fk_parent1', 'fk_parent2', 'mairie', 'social_number']
widgets = {'country': CountrySelectWidget()}
def __init__(self, *args, **kwargs):
super(BirthCertificateForm2, self).__init__(*args, **kwargs)
for key, value in self.fields.iteritems() :
self.fields[key].widget.attrs.update({'class':'form-fields'})
我的观点功能：
@login_required
def BirthCertificate_Form_unique_number(request) :
#User fill some fields
query_social_number = request.GET.get('social_number')
query_social_number_father = request.GET.get('social_number_father')
query_social_number_mother = request.GET.get('social_number_mother')
if request.method == 'POST':
form = BirthCertificateForm2(request.POST or None)
if form.is_valid() : # Vérification sur la validité des données
post = form.save()
return HttpResponseRedirect(reverse('BC_treated2', kwargs={'id': post.id}))
else:
form = BirthCertificateForm2()
parent1 = Person.objects.filter(social_number=query_social_number_father)
parent2 = Person.objects.filter(social_number=query_social_number_mother)
individu = get_object_or_404(Person, social_number = query_social_number)
form.fields['fk_parent1'].queryset = parent1
form.fields['fk_parent2'].queryset = parent2
form.fields['lastname'].initial = individu.lastname
form.fields['firstname'].initial = individu.firstname
form.fields['birthday'].initial = individu.birthday
form.fields['birthcity'].initial = individu.birthcity
form.fields['birthcountry'].initial = individu.birthcountry
form.fields['sex'].initial = individu.sex
form.fields['social_number'].initial = individu.social_number
context = {
"form" : form,
}
print request.POST
return render(request, 'BC_form2.html', context)
现在它有效：）
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