casting ints to str in Jinja2

python jinja2

Mahmoud Hanafy · Mar 25, 2012 · Viewed 23.2k times · Source

I want to cast an int that's passed to the template through the url, but it says that the str function isn't defined.

How do I get around this?

Here's my code:

{% extends "base.html" %}

{% block content %}

    {% for post in posts %}
    {% set year = post.date.year %}
    {% set month = post.date.month %}
    {% set day = post.date.day %}
    {% set p = str(year) + '/' + str(month) + '/' + str(day) + '/' + post.slug %}
    <h3>
        <a href="{{ url_for('get_post', ID=p) }}">
            {{ post.title }}
        </a>
    </h3>

        <p>{{ post.content }}</p>
    {% else: %}
            There's nothing here, move along.
    {% endfor %}

{% endblock %}

Answer

Jinja2 also defines the ~ operator, which automatically converts arguments to string first, as an alternative to the + operator.

Example:

{% set p = year ~ '/' ~ month ~ '/' ~ day ~ '/' ~ post.slug %}

See Other operators or, if you really want to use str, modify the Environment.globals dictionary.

casting ints to str in Jinja2

Answer

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