Django的1.10/AttributeError的： '名单' 对象有没有属性 '_meta'

Question

我得到这个错误：

内部服务器错误：/ QOP/1/editar/ 回溯（最近通话最后一个）： .. opts = instance._meta AttributeError：'list'object has no attribute'_meta' [25/Nov/2016 19:17:00]“GET/QOP/1/editar/HTTP/1.1”500 77572

models.py

from django.db import models 
from smart_selects.db_fields import ChainedForeignKey 
from django.core.urlresolvers import reverse 
from modulos.modPessoas.models import Postos 


# Quadro Orgânico Pessoal 

class Qop(models.Model): 
    class Meta: 
     ordering = ['qop_ref'] 
     verbose_name = 'Quadro Orgânico Pessoal' 
     verbose_name_plural = 'Quadro Orgânico Pessoal' 

    qop_ref = models.CharField(max_length=255, null=True, blank=True, verbose_name='Referência') 
    qop_nome = models.CharField(max_length=255, null=True, blank=True, verbose_name='QOP Nome') 
    qop_dt_arov = models.DateField(null=True, blank=True, verbose_name='Data de Aprovação') 
    qop_atv = models.BooleanField(default=True, verbose_name='Ativo?') 

    def __str__(self): 
     return '{} {}'.format(self.qop_ref, self.qop_nome) 

    def get_absulute_url(self): 
     return reverse("QOP:detalhe", kwargs={"pk": self.id}) 

views.py

def qop_editar(request, pk=None): 
    instance = get_list_or_404(Qop, id=pk) 
    form = QopForm(request.POST or None, request.FILES or None, instance=instance) 
    if form.is_valid(): 
     instance = form.save(commit=False) 
     instance.save() 
    contexto = { 
     "titulo": "QOP Editar", 
     "instance": instance, 
     "form": form 
    } 
    return render(request, "modQOP/editar.html", contexto) 

urls.py

from django.conf.urls import url 
from .views import (index, 
        qop_lista, 
        qop_detalhe, 
        qop_criar, 
        qop_editar) 

urlpatterns = [ 
    url(r'^$', index), 
    url(r'^criar/$', qop_criar), 
    url(r'^lista/$', qop_lista), 
    url(r'^(?P<pk>\d+)/detalhe/$', qop_detalhe, name='detalhe'), 
    url(r'^(?P<pk>\d+)/editar/$', qop_editar, name='editar'), 
] 

模板

<form method="post" action="" enctype="multipart/form-data"> 
{% csrf_token %} 
    Nome: {{ form.qop_nome }}<br> 
    Nº de Referência: {{ form.qop_ref }}<br> 
    Data de Aprovação: {{ form.qop_dt_arov }}<br> 
    Ativo? {{ form.qop_atv }}<br> 
<button type="submit" class="button">Guardar</button> 
</form> 

什么是wron g用代码？

在此先感谢！

编辑： 完整回溯：

Environment: 


Request Method: GET 
Request URL: http://127.0.0.1:8000/QOP/1/editar/ 

Django Version: 1.10.3 
Python Version: 3.5.2 
Installed Applications: 
['django.contrib.admin', 
'django.contrib.auth', 
'django.contrib.contenttypes', 
'django.contrib.sessions', 
'django.contrib.messages', 
'django.contrib.staticfiles', 
'smart_selects', 
'modulos.modAutenticacao', 
'modulos.modQOP', 
'modulos.modPessoas'] 
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'] 



Traceback: 

File "C:\Users\Filipe\envRTm\lib\site-packages\django\core\handlers\exception.py" in inner 
    39.    response = get_response(request) 

File "C:\Users\Filipe\envRTm\lib\site-packages\django\core\handlers\base.py" in _get_response 
    187.     response = self.process_exception_by_middleware(e, request) 

File "C:\Users\Filipe\envRTm\lib\site-packages\django\core\handlers\base.py" in _get_response 
    185.     response = wrapped_callback(request, *callback_args, **callback_kwargs) 

File "C:\Users\Filipe\Documents\GitHub\rhead\modulos\modQOP\views.py" in qop_editar 
    36.  form = QopForm(request.POST or None, request.FILES or None, instance=instance) 

File "C:\Users\Filipe\envRTm\lib\site-packages\django\forms\models.py" in __init__ 
    282.    object_data = model_to_dict(instance, opts.fields, opts.exclude) 

File "C:\Users\Filipe\envRTm\lib\site-packages\django\forms\models.py" in model_to_dict 
    87.  opts = instance._meta 

Exception Type: AttributeError at /QOP/1/editar/ 
Exception Value: 'list' object has no attribute '_meta' 

Answer 1

不能从get_list_or_404结果传递到的ModelForm实例，因为它会返回一个查询集。您需要使用get_object_or_404来返回模型的一个实例。