osem-fcy/app/views/admin/versions/_object_desc_and_link.html.haml

:ruby
  object = current_or_last_object_state(version.item_type, version.item_id)

  unless version.item_type == 'Role' || version.item_type == 'UsersRole'
    conference = Conference.find_by(id: version.conference_id)
    conference_short_title = conference.try(:short_title) || current_or_last_object_state('Conference', version.conference_id).try(:short_title) || ' '
  end

- case version.item_type
- when 'UsersRole'
  - role = current_or_last_object_state('Role', object.role_id)
  - role_name = role.try(:name) || PaperTrail::Version.where(item_type: 'Role', item_id: object.role_id).last.changeset[:name].second
  role
  - conference = Conference.find_by(id: version.conference_id)
  - conference_short_title = conference.try(:short_title) || current_or_last_object_state('Conference', version.conference_id).try(:short_title) || ' '
  = link_if_alive version, role.try(:name), admin_conference_role_path(conference_short_title,role.try(:name) || ' '), conference

  = version.event == 'create' ? 'to' : 'from'
  user
  = link_to_user(object.user_id)

- when 'Subscription', 'Registration'
  conference
  = link_to_conference(version.conference_id)

- when 'Commercial'
  - commercialable = current_or_last_object_state(object.commercialable_type, object.commercialable_id)

  - case object.commercialable_type
  - when 'Event'
    commercial in event
    - if commercialable && conference
      =  link_to commercialable.title,
             admin_conference_program_event_path(conference, commercialable.id)
    - else
      = commercialable.title
      = "with ID #{commercialable.id}"

  - when 'Venue'
    commercial in venue
    - if commercialable && conference
      = link_to commercialable.name,
            edit_admin_conference_venue_path(conference_short_title,
                                             commercialable.id, anchor: 'commercials-content')
    - else
      = commercialable.name
      = "with ID #{commercialable.id}"

  - when 'Conference'
    commercial in conference
    - if commercialable
      = link_to commercialable.short_title,
              admin_conference_commercials_path(commercialable.short_title)
    - else
      = commercialable.short_title
      = "with ID #{commercialable.id}"

- when 'EventsRegistration', 'Comment', 'Vote', 'Event'
  event
  - event_id = object.try(:event_id) || object.try(:commentable_id) || object.id
  = link_to (current_or_last_object_state('Event', event_id).try(:title) || 'deleted event'),
          admin_conference_program_event_path(conference_short_title, event_id)

- when 'EventSchedule'
  event
  = link_to (current_or_last_object_state('Event', object.event_id).try(:title) || 'deleted'),
           admin_conference_program_event_path(conference_short_title, object.event_id)
  in
  =  link_to "Schedule #{version.item.schedule_id}",
            admin_conference_schedule_path(conference_short_title, version.item.schedule_id)

- when 'Schedule'
  = link_if_alive version, "Schedule #{version.item_id}",
            admin_conference_schedule_path(conference_short_title, version.item_id),
            conference

- when 'Conference'
  conference
  = link_to_conference(version.item_id)

- when 'RegistrationPeriod'
  = link_if_alive version, 'registration period',
          admin_conference_registration_period_path(conference_short_title),
          conference

- when 'Contact'
  = link_if_alive version, 'contact details',
          edit_admin_conference_contact_path(conference_short_title),
          conference

- when 'Booth'
  = t 'booth'
  = link_if_alive version, object.title,
          admin_conference_booth_path(conference_id: Conference.find(version.conference_id).short_title, id: version.item_id ),
          conference

- when 'Program'
  = link_if_alive version, 'program',
          admin_conference_program_path(conference_short_title),
          conference

- when 'Cfp'
  cfp for
  = link_if_alive version, object.cfp_type,
          admin_conference_program_cfp_path(conference_short_title, version.item_id),
          conference

- when 'Track'
  track
  = link_if_alive version, object.name,
          admin_conference_program_track_path(conference_short_title, object.try(:short_name)),
          conference

- when 'EventType'
  event type
  = link_if_alive version, object.title,
          admin_conference_program_event_types_path(conference_short_title),
          conference

- when 'Role'
  role
  - role_name = object.try(:name) || PaperTrail::Version.where(item_type: 'Role', item_id: version.item_id).last.changeset[:name].second
  - conference = Conference.find_by(id: version.conference_id)
  - conference_short_title = conference.try(:short_title) || current_or_last_object_state('Conference', version.conference_id).try(:short_title) || ' '
  = link_if_alive version, role_name,
          admin_conference_role_path(conference_short_title, role_name), conference

- when 'Venue'
  venue
  = link_if_alive version, object.name,
          admin_conference_venue_path(conference_short_title),
          conference

- when 'Lodging'
  lodging
  = link_if_alive version, object.name,
          admin_conference_lodgings_path(conference_short_title),
          conference

- when 'Room'
  room
  = link_if_alive version, object.name,
          admin_conference_venue_rooms_path(conference_short_title),
          conference

- when 'Sponsor'
  sponsor
  = link_if_alive version, object.name,
          admin_conference_sponsors_path(conference_short_title),
          conference

- when 'SponsorshipLevel'
  sponsorship level
  = link_if_alive version, object.title,
          admin_conference_sponsorship_levels_path(conference_short_title),
          conference

- when 'Ticket'
  ticket
  = link_if_alive version, object.title,
          admin_conference_ticket_path(conference_short_title, version.item_id),
          conference

- when 'DifficultyLevel'
  difficulty level
  = link_if_alive version, object.title,admin_conference_program_difficulty_levels_path(conference_short_title), conference

- when 'Splashpage'
  = link_if_alive version, 'splashpage',
          admin_conference_splashpage_path(conference_short_title),
          conference

- when 'EmailSettings'
  = link_if_alive version, 'email settings',
          admin_conference_emails_path(conference_short_title),
          conference

- when 'User'
  - if version.event == 'update'
    user
    = link_to_user(version.item_id)

- unless %w(Conference Subscription Registration User).include?(version.item_type)
  - if version.item_type == 'Commercial'
    - commercial = current_or_last_object_state(version.item_type, version.item_id)
    - commercialable = current_or_last_object_state(commercial.commercialable_type, commercial.commercialable_id)
    - unless commercial.commercialable_type == 'Conference'
      in conference
      = link_to_conference(version.conference_id)
  - else
    in conference
    = link_to_conference(version.conference_id)