Examine all flash message queues, pop them, and display their messages with the correct Twitter Bootstrap alert

flash_message_queue.macro.jinja2

{% macro render_flash(key, cls) %}
{% if request.session.peek_flash(key) %}
    {% for msg in request.session.pop_flash(key) %}
        <div class="alert alert-{{ cls }} alert-dismissible" role="alert">
            <button type="button" class="close" data-dismiss="alert" aria-label="Close"><span aria-hidden="true">&times;</span></button>
            {{ msg }}
        </div>
    {% endfor %}
{% endif %}
{% endmacro %}

{{ render_flash('', 'info') }}
{{ render_flash('info', 'info') }}
{{ render_flash('success', 'success') }}
{{ render_flash('warning', 'warning') }}
{{ render_flash('error', 'danger') }}