Now, FBV is converted to CBV

bookshelf/urls.py

 from django.urls import path
-from . import views
+from .views import HomeView, AuthorListView, AuthorDetailView, BookListView, BookDetailView
 
 urlpatterns = [
-    path('home/', views.home, name = "home"),
-    path('books/', views.books, name = "books"),
-    path('books/<int:pk>/details', views.books_detail, name = "books_detail"),
-    path('authors/', views.authors, name = "authors"),
-     path('authors/<int:pk>/details', views.authors_detail, name = "authors_detail"),
+    # for Home (landing page)
+    path('', 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'),
+    # for Books page
+    path('books/', BookListView.as_view(), name='books'),
+    path('books/<int:pk>/details', BookDetailView.as_view(), name='book-detail'),
 ]
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bookshelf/views.py

-from django.http import HttpResponse
-from .models import Author, Books
-from datetime import date
-from django.template import loader
+from django.views import View
+from django.views.generic import ListView, DetailView
 from django.shortcuts import render
+from .models import Author, Books
 
+# View for Home (landing page)
+class HomeView(View):
+    def get(self, request):
+        return render(request, 'home/index.html')
 
-# views for Home (landing page)
-def home(request):
-    context = {}
-    template = loader.get_template('home/index.html')
-    return HttpResponse(template.render(context, request))
+# Views for Authors page
+class AuthorListView(ListView):
+    model = Author
+    template_name = 'authors/index.html'
+    context_object_name = 'authors'
+    ordering = ['first_name']
 
-# for Authors page
-def authors(request):
-    authors = Author.objects.order_by('first_name')
-    context = {'authors': authors}
-    template = loader.get_template('authors/index.html')
-    return HttpResponse(template.render(context, request))
+class AuthorDetailView(DetailView):
+    model = Author
+    template_name = 'authors/author.html'
+    context_object_name = 'author'
 
-def authors_detail(request, pk):
-    author = Author.objects.get(pk=pk)
-    # get books related to the author's id.
-    books = Books.objects.filter(author__pk = pk)
-    context = {'author': author, 'books': books}
-    template = loader.get_template('authors/author.html')
-    return HttpResponse(template.render(context, request))
-    
+    # this line for getting the param value "pk"
+    # returns Dict[str, Any]
+    def get_context_data(self, **kwargs):
+        context = super().get_context_data(**kwargs)
+        # get by self == Author's id to get Book's foreign key that matches up.
+        context['books'] = Books.objects.filter(author = self.object)
+        return context
 
-# for Books page
-def books(request):
-    books = Books.objects.order_by('year_published')
-    context = {'books': books}
-    template = loader.get_template('books/index.html')
-    return HttpResponse(template.render(context, request))
+# Views for Books page
+class BookListView(ListView):
+    model = Books
+    template_name = 'books/index.html'
+    context_object_name = 'books'
+    ordering = ['year_published']
 
-def books_detail(request, pk):
-    book = Books.objects.get(pk=pk)
-    context = {'book': book}
-    template = loader.get_template('books/book.html')
-    return HttpResponse(template.render(context, request))
+class BookDetailView(DetailView):
+    model = Books
+    template_name = 'books/book.html'
+    context_object_name = 'book'
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