我创建了一个带有实例的modelForm到现有模型（Book） . 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“No Publisher与给定查询匹配” .

models.py

class Publisher（models.Model）：

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"]

class Author（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

class Book（models.Model）：

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)

class BookForm（ModelForm）：

class Meta:

    model = Book

views.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})

错误消息

找不到页（404）请求方法：POST Request URL：http://127.0.0.1:8000/books/bookupd/

没有Publisher匹配给定的查询 .

你看到这个错误，因为你的Django设置文件中有DEBUG = True . 将其更改为False，Django将显示标准的404页面 .

urls.py

来自django.conf.urls.defaults import *

来自django.views.generic.simple import direct_to_template

来自mysite10.books.views导入about_pages，books_by_publisher，authorcontact，bookcontact，booklisting，authorcontactupd

来自django.views.generic import list_detail

来自mysite10.books.models import Publisher，Book

来自django.contrib import admin

admin.autodiscover（）

def get_books（）：

return Book.objects.all()

publisher_info = {

'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 = patterns（''，

(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'),

）

-------------------------------------------------

我终于得到了以下代码 . urls.py中的错误，因为在$之前缺少正斜杠 . 修改为（r'^ books / bookupd /（\ d）/ $'

views.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})

urls.py

（r'^ books / bookupd /（\ d）/ $'，'mysite10.books.views.book_upd'），