我创建了一个带有现有模型（书）实例的模型表单。我无法更新图书记录。添加新记录很好，但是当我尝试更新时，它似乎无法找到发布者（这是一个外键）。错误是“没有发布者与给定的查询匹配。”
模型.py
类发布者（模型。模型）：
name = models.CharField(max_length=30)
address = models.CharField(max_length=50)
city = models.CharField(max_length=60)
state_province = models.CharField(max_length=30)
country = models.CharField(max_length=50)
website = models.URLField()
def __unicode__(self):
return self.name
class Meta:
ordering = ["name"]
类作者（models.Model）：
first_name = models.CharField(max_length=30)
last_name = models.CharField(max_length=40)
email = models.EmailField(blank=True, verbose_name='e-mail')
objects = models.Manager()
sel_objects=AuthorManager()
def __unicode__(self):
return self.first_name+' '+ self.last_name
类书（模型。模型）：
title = models.CharField(max_length=100)
authors = models.ManyToManyField(Author)
publisher = models.ForeignKey(Publisher)
publication_date = models.DateField(blank=True, null=True)
num_pages = models.IntegerField(blank=True, null=True)
类BookForm（ModelForm）：
class Meta:
model = Book
视图.py
def authorcontactupd(request,id):
if request.method == 'POST':
a=Author.objects.get(pk=int(id))
form = AuthorForm(request.POST, instance=a)
if form.is_valid():
form.save()
return HttpResponseRedirect('/contact/created')
else:
a=Author.objects.get(pk=int(id))
form = AuthorForm(instance=a)
return render_to_response('author_form.html', {'form': form})
错误信息
找不到页面 (404) 请求方法：POST 请求 URL：http: //127.0.0.1 :8000/books/bookupd/
没有发布者与给定的查询匹配。
您看到此错误是因为您的 Django 设置文件中有 DEBUG = True 。将其更改为 False，Django 将显示标准 404 页面。
网址.py
从 django.conf.urls.defaults 导入 *
从 django.views.generic.simple 导入 direct_to_template
从 mysite10.books.views 导入 about_pages、books_by_publisher、authorcontact、bookcontact、booklisting、authorcontactupd
从 django.views.generic 导入 list_detail
从 mysite10.books.models 导入出版商，书籍
从 django.contrib 导入管理员
admin.autodiscover()
def get_books():
return Book.objects.all()
出版商信息 = {
'queryset': Publisher.objects.all(),
'template_name':'books/publisher_publisher_list_page.html',
'template_object_name': 'publisher',
'extra_context': {'book_list': Book.objects.all},
}
book_info = {
'queryset': Book.objects.order_by('-publication_date'),
'template_name':'books/publisher_publisher_list_page.html',
'template_object_name': 'book',
'extra_context': {'publisher_list': Publisher.objects.all},
}
oreilly_books = {
'queryset': Book.objects.filter(publisher__name="O'Reilly"),
'template_name':'books/publisher_publisher_list_page.html',
'template_object_name': 'book',
'extra_context': {'publisher_list': Publisher.objects.all},
}
urlpatterns = 模式（''，
(r'^admin/(.*)', admin.site.root),
(r'^polls/', include('mysite10.polls.urls')),
(r'^search-form/$', 'mysite10.views.search_form'),
(r'^search/$', 'mysite10.views.search'),
(r'^contact/$', 'mysite10.contact.views.contact'),
(r'^contact/thanks2/(\d+)$', 'mysite10.contact.views.thanks2'),
(r'^contact/thanks/$', 'mysite10.contact.views.thanks'),
(r'^publishers/$', list_detail.object_list, publisher_info),
(r'^books/$', list_detail.object_list, book_info),
(r'^books/oreilly/$', list_detail.object_list, oreilly_books),
(r'^books/(\w+)/$', books_by_publisher),
(r'^author/$', authorcontact),
(r'^authorupd/(\d+)/$', authorcontactupd),
(r'^contact/created/$', 'mysite10.books.views.created'),
(r'^bookform/$', bookcontact),
(r'^contact/bookscreated/$', 'mysite10.books.views.books_created'),
(r'^booklist/$', 'mysite10.books.views.booklisting'),
(r'^books/bookupd/(\d+)$', 'mysite10.books.views.book_upd'),
)
-------------------------------------------------
我终于让它使用下面的代码。urls.py 中的错误，因为 $ 之前缺少正斜杠。修改为 (r'^books/bookupd/(\d+)/$'
视图.py
def book_upd(request,id):
if request.method == 'POST':
a=Book.objects.get(pk=int(id))
form = BookForm(request.POST, instance=a)
if form.is_valid():
form.save()
return HttpResponseRedirect('/contact/bookscreated')
else:
a=Book.objects.get(pk=int(id))
form = BookForm(instance=a)
return render_to_response('book_form.html', {'form': form})
网址.py
(r'^books/bookupd/(\d+)/$', 'mysite10.books.views.book_upd'),