2 forms, 1 view, 2 SQL tables in Django

I am trying to figure out how to post data from two django forms to two separate database tables from the same view . I only need one submit button. While this question got me closer to a solution, I am getting errors and no data is being written to the database. I think this code is actually validating two forms against each other, rather than submitting both forms in one go. Any ideas?

Here's what I've tried:

For one form -> one table. It works, so this is a start.

# views.py
def BookFormView(request):
    if request.method == 'POST':
    form = BookForm(request.POST)
        if form.is_valid():
            form.save()
            return HttpResponseRedirect("/books/")
    else:
        form = BookForm()
    return render(request, 'books/createbooks.html',
              {'form' : form})

      

        
        
        
      

    

However, when I add this form from a .py form to get subsequent views.py I get local variable 'book_form' referenced before assignment

. This is usually an easy problem with the vs-local global variable to fix, but I don't know what that means in this case.

def BookFormView(request):
    if request.method == 'POST':
        if 'book' in request.POST:
            book_form = BookForm(request.POST, prefix='book')
            if book_form.is_valid():
                book_form.save()
                return HttpResponseRedirect("/books/")

            bookdetailsform = BookDetailsForm(prefix='bookdetails')
        elif 'bookdetails' in request.POST:
            bookdetailsform = BookDetailsForm(request.POST, prefix='bookdetails')
            if bookdetailsform.is_valid():
                bookdetailsform.save()
                return HttpResponseRedirect("/books/")

            book_form = BookForm(prefix='book')
    else:
        book_form = BookForm(prefix='book')
        bookdetailsform = BookDetailsForm(prefix='bookdetails')
    return render(request, 'books/createbook.html',
            {'book_form' : book_form,
             'bookdetailsform': bookdetailsform})