A Page for Each Book

Part of the Models and the Admin section of Coddy's Django journey. Lesson 14 of 23.

Each book needs a page at its own address: /books/1/, /books/2/. A path converter, from Django Basics, captures that number and passes it to the view. A page of the books from one year:

path("years/<int:year>/", views.books_of_year, name="books_of_year"),

def books_of_year(request, year):
    books = Book.objects.filter(year=year)
    return render(request, "books/year.html", {"year": year, "books": books})

A page for one row names it by its primary key, pk: its id. get() on a missing row raises, and an exception in a view is a crash, 500 Server Error. get_object_or_404() from django.shortcuts responds with 404 Page not found instead. It takes the model, then the conditions: get_object_or_404(Book, title="Emma").

To link to a route that captures a value, put the value after the name: {% url 'books:books_of_year' book.year %}.

Challenge

Medium

Give every book a page. The template books/book_detail.html is ready and expects book.

In books/views.py, write book_detail(request, pk): it shows the book with that id, or responds with 404.
In books/urls.py, route /books/<id>/, numbers only, to it as book_detail.
In home.html, link each title to its page. Only the title is the link: <a ...>Dune</a> (1965).

Click Dune on the home page, then open /books/999/: Page not found (404).

Try it yourself

from django.shortcuts import render

from .models import Book


def home(request):
    books = Book.objects.all()
    return render(request, "books/home.html", {"books": books})