Challenge 1: Render a List With Filters — Possible Solution
====================================================================

<!-- catalog/templates/catalog/book_list.html -->

<h1>All Books</h1>

{% if books %}
  <ul>
  {% for book in books %}
    <li>
      <strong>{{ book.title|upper }}</strong>
      — {{ book.description|truncatewords:15 }}
    </li>
  {% endfor %}
  </ul>
{% else %}
  <p>No books in the catalog yet.</p>
{% endif %}

<!-- corresponding view, for context -->
<!-- catalog/views.py -->

from django.shortcuts import render

def book_list(request):
    books = [
        {
            "title": "Dune",
            "description": "A boy becomes the prophesied leader of a desert planet's "
                            "native people after his family is betrayed and destroyed "
                            "by a rival house, setting in motion a galaxy-spanning war.",
        },
        {
            "title": "1984",
            "description": "A man working for a totalitarian government's propaganda "
                            "ministry begins to question the Party's control over "
                            "truth, memory, and thought itself.",
        },
    ]
    return render(request, "catalog/book_list.html", {"books": books})

WHY THIS WORKS
--------------
- {% if books %} checks truthiness the same way Python does — an empty
  list is falsy, so the {% else %} branch renders the fallback message
  automatically whenever the context variable is missing or empty,
  without needing a separate {% if books|length > 0 %} check.
- {{ book.title|upper }} applies the built-in `upper` filter, converting
  the string to uppercase entirely within the template — no changes
  needed in the view or the underlying data.
- {{ book.description|truncatewords:15 }} cuts the description down to
  its first 15 words and appends an ellipsis automatically — useful for
  list views where a full description would be too long, while the full
  text remains available on a detail page.
- forloop.counter (from the chapter) wasn't strictly needed here since
  the challenge didn't ask for numbering, but could be added the same way
  shown in the chapter if a numbered list were wanted instead of a plain
  bulleted one.