{% if course.enrolled? %}
  <a
    href="{% route activity_viewer,
      id: activity.id,
      course_id: params.course_id,
      learning_path_id: params.learning_path_id
    %}" class="{{ class }}"
  >
    {{ activity.title }}
  </a>
{% else%}
  <span class="{{ class }}">
    {{ activity.title }}
  </span>
{% endif %}