fixed the form and added a .save method to save the model

Deokhyun_Lee_reading/bookshelf/forms.py

 from django import forms
-from .models import Author
+from .models import Author, Books
 
 class AddBookForm(forms.Form):
-    title  = forms.CharField(max_length = 100)
-    author = forms.ModelChoiceField(queryset=Author.objects.all())
-    publisher = forms.CharField(max_length = 100)
-    year_published = forms.DateTimeField()
-    ISBN = forms.CharField(max_length = 13)
-    blurb = forms.CharField(max_length = 250)
+    class Meta:
+        model = Books
+        fields = '__all__'
+
+    def save(self, commit=True):
+        book = super().save(commit=False)
+        # Do any additional processing of the form data here
+        if commit:
+            book.save()
+        return book

Deokhyun_Lee_reading/bookshelf/views.py

 from django.views import View
-from django.urls import reverse
-from django.http import HttpResponseRedirect
+from django.shortcuts import render, redirect
 from django.views.generic import ListView, DetailView, CreateView
 from django.shortcuts import render
 from .models import Author, Books
@@ -48,17 +47,12 @@ class BookAddListView(CreateView):
     fields = '__all__'
     template_name = "books/add-book.html"
 
-    def form_valid(self, form):
-        # initially false
-        book = form.save(commit=False)
-        
-        # do anything here
-        # get the pk of the book that was being created
-        pk = book.pk
-        print('pk is: ', pk)
-        # The url will be based on the primary key here as an args. 
-        url = reverse('book-detail', args=[pk])
+    def post(self, request):
+        form = AddBookForm(request.POST)
+        if form.is_valid():
+            # onSave is called, the form will have essential data and this includes pk as well. 
+            new_book = form.save()
+            # pass the pk
+            return redirect('subject_detail', pk = new_book.pk)
+        else:
+            return render(request, 'subject_detail.html', {'form': form})
\ No newline at end of file
-        # save the object
-        book.save()
-        # redirects to the url based on the pk
-        return HttpResponseRedirect(url)
\ No newline at end of file