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})

Produces this 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.

[Malcolm Tredinnick]

This looks like a problem in your code, rather than Django. Please post some details to the mailing list to get help with this.

I'll note that the error is reporting a problem about the Publisher model, which is not going to be used by AuthorForm at all. So you should start out by checking you are debugging the right problem.

(fixed description)