urls.py:

url(r'^book/(?P<booktitle>[\w\._-]+)/(?P<bookeditor>[\w\._-]+)/(?P<bookpages>[\w\._-]+)/(?P<bookid>[\d\._-]+)/$', 'book.views.book', name="book"), 

views.py:

def book(request, booktitle, bookeditor, bookpages, bookid, template_name="book.html"):

    book = get_object_or_404(book, pk=bookid)


    if booktitle != book.book_title :
        redirect_to = "/book/%s/%s/%s/%s/%i/" % ( booktitle, bookeditor, bookpages, bookid, )
        return HttpResponseRedirect(redirect_to)

    return render_to_response(template_name, { 'book': book, },)

.

So the urls of each book are like this:

example.com/book/the-bible/gesu-crist/938/12/

I want that if there is an error in the url, then I get redirected to the real url by using book.id in the end of the url.

For example if I go to:

example.com/book/A-bible/gesu-crist/938/12/

the I will get redirected to:

example.com/book/the-bible/gesu-crist/938/12/

but I go to wrong url I will get this error:

TypeError at /book/A-bible/gesu-crist/938/12/

%d format: a number is required, not unicode

.

Why ? What I have to do ?