{% macro render_messages() %}
    {% with messages = get_flashed_messages(with_categories=True) %}
        {% if messages %}
            {% with mapping = {
                'critical':'danger',
                'error': 'danger',
                'info': 'info',
                'warning': 'warning',
                'debug':'primary',
                'notset': 'primary',
                'message': 'primary',
                } %}
                {% for category, msg in messages %}
                    <div class="alert alert-{{ mapping.get(category, category) }} alert-dismissable fade show">
                        {{ msg }}
                        <button type="button" class="close" data-dismiss="alert"><span aria-hidden="true">x</span></button>
                    </div>
                {% endfor %}
            {% endwith %}
        {% endif %}
    {% endwith %}
{% endmacro %}