3. Example - URL Reversal

1. Update the View to Use a Template

Modify views.py so that it renders a template instead of returning plain text.

View for ID-based Book Detail

from django.shortcuts import render, get_object_or_404
from .models import Book  # Import your Book model

def book_detail(request, book_id):
    book = get_object_or_404(Book, id=book_id)  # Fetch book by ID
    return render(request, 'book_detail.html', {'book': book})

View for Slug-based Book Detail

def book_detail_by_slug(request, book_slug):
    book = get_object_or_404(Book, slug=book_slug)  # Fetch book by slug
    return render(request, 'book_detail.html', {'book': book})

2. Create a Django Template (`book_detail.html`)

Inside your app’s templates folder, create a file named book_detail.html.

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>{{ book.title }}</title>
</head>
<body>
    <h1>{{ book.title }}</h1>
    <p><strong>Author:</strong> {{ book.author }}</p>
    <p><strong>Published Date:</strong> {{ book.published_date }}</p>
    <p><strong>Description:</strong> {{ book.description }}</p>

    <a href="{% url 'book_list' %}">Back to Books</a>
</body>
</html>

3. Define the `Book` Model

If you haven’t already created a Book model, define it in models.py:

from django.db import models

class Book(models.Model):
    title = models.CharField(max_length=200)
    author = models.CharField(max_length=100)
    slug = models.SlugField(unique=True)
    description = models.TextField()
    published_date = models.DateField()

    def __str__(self):
        return self.title

Run the following commands to apply the model changes:

python manage.py makemigrations
python manage.py migrate

4. Create a Book List Page

To display a list of books with links to their details, create another view and template.

View for Listing Books (`views.py`)

def book_list(request):
    books = Book.objects.all()
    return render(request, 'book_list.html', {'books': books})

URL Configuration (`urls.py`)

urlpatterns = [
    path('books/', views.book_list, name='book_list'),  # List all books
    path('book/<int:book_id>/', views.book_detail, name='book_detail'),  # View book by ID
    path('book/<slug:book_slug>/', views.book_detail_by_slug, name='book_detail_by_slug'),  # View book by slug
]

Template for Listing Books (`book_list.html`)

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Book List</title>
</head>
<body>
    <h1>Book List</h1>
    <ul>
        {% for book in books %}
            <li>
                <a href="{% url 'book_detail' book.id %}">{{ book.title }}</a>
                - <a href="{% url 'book_detail_by_slug' book.slug %}">(View by Slug)</a>
            </li>
        {% endfor %}
    </ul>
</body>
</html>

5. Running the Project

Start your Django server:

python manage.py runserver

Now, open your browser and visit:

Book List: http://127.0.0.1:8000/books/
Book Detail by ID: http://127.0.0.1:8000/book/1/
Book Detail by Slug: http://127.0.0.1:8000/book/django-for-beginners/

Summary

✔ Defined URL patterns for book details using ID and slug
✔ Created a view to fetch and display book details
✔ Designed templates to show book details and book lists
✔ Implemented a Book model to store book information

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