Template Filters

Part of the Django Basics section of Coddy's Django journey. Lesson 15 of 23.

The drinks list should say how many drinks there are and show prices like $3.50, but {{ drink.price }} prints 3.5. A filter changes a value as the template prints it. It follows a |, and some take an argument after a colon:

{{ guest.name|upper }}         {# ADA #}
{{ rating|floatformat:1 }}     {# 4.7, when rating is 4.66 #}
{{ boxes|length }} box{{ boxes|pluralize:"es" }}

{# ... #} is a template comment, never shown. floatformat's argument is how many decimals it always shows. length counts a list's items, and pluralize adds an ending, s unless you give another, when the count is not exactly one: 3 boxes, 1 box.

Filters change only what is printed, never the data in your view.

Challenge

Easy

In drinks.html:

under the <h1>, a <p class="count"> that says 4 drinks, or 1 drink when there is one;
in each drink's <li>, after the name, a <span class="price"> with two decimals: $3.50.

Press Run and look at /drinks/.

Try it yourself

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <title>Our Drinks</title>
</head>
<body>
    <h1>Our Drinks</h1>
    <ul>
        {% for drink in drinks %}
            <li class="drink">
                {{ drink.name }}
                {% if drink.sold_out %}
                    <span class="sold-out">Sold out</span>
                {% endif %}
            </li>
        {% empty %}
            <li>No drinks today.</li>
        {% endfor %}
    </ul>
</body>
</html>