aardbei/app/views/activities/_presence_bu...

.btn-group.btn-group-xs{role: "group"}
  %button.btn.btn-success.btn-present{data: {person_id: person.id, activity_id: activity.id, group_id: activity.group.id}}
    - if !state
      %i.fa.fa-check
    - else
      %i.fa.fa-check-circle

  %button.btn.btn-danger.btn-absent{data: {person_id: person.id, activity_id: activity.id, group_id: activity.group.id}}
    - if state == false
      %i.fa.fa-times-circle
    - else
      %i.fa.fa-times