fixed the url pattern name

Deokhyun_Lee_reading/bookshelf/forms.py

 from django import forms
-from .models import Author, Books
+from .models import Books
 
-class AddBookForm(forms.Form):
+class AddBookForm(forms.ModelForm):
     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
+    # 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/urls.py

@@ -6,9 +6,9 @@ urlpatterns = [
     path('home/', HomeView.as_view(), name='home'),
     # for Authors page
     path('authors/', AuthorListView.as_view(), name='authors'),
-    path('authors/<int:pk>/details', AuthorDetailView.as_view(), name='author-detail'),
+    path('authors/<int:pk>/details', AuthorDetailView.as_view(), name='author_detail'),
     # for Books page
     path('books/', BookListView.as_view(), name='books'),
-    path('books/<int:pk>/details', BookDetailView.as_view(), name='book-detail'),
-    path('books/add',BookAddListView.as_view(), name="add-book" )
+    path('books/<int:pk>/details', BookDetailView.as_view(), name='book_detail'),
+    path('books/add',BookAddListView.as_view(), name="add_book" )
 ]
\ No newline at end of file

Deokhyun_Lee_reading/bookshelf/views.py

@@ -53,6 +53,6 @@ class BookAddListView(CreateView):
             # 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)
+            return redirect('book-details', pk = new_book.pk)
         else:
-            return render(request, 'subject_detail.html', {'form': form})
+            return render(request, 'book_details.html', {'form': form})
\ No newline at end of file