Saving ModelForm to update exisitng record generates No {model} matches the given query.

[mcwong644]

#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)

objects = models.Manager()

bookobjects = BookManager()

wong = WongAuthor()

class BookForm(ModelForm):

class Meta:

model = Book

#view.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})

# error

Page not found (404)
Request Method: POST
Request URL: ​http://127.0.0.1:8000/books/bookupd/

No Publisher matches the given query.

You're seeing this error because you have DEBUG = True in your Django settings file. Change that to False, and Django will display a standard 404 page.