table.table
  tr
    th Username
    - @roles.each do |role|
      th = role.to_s.titleize
    end
  - @users.each do |user|
    tr
      td = user.username
      - @roles.each do |role|
        td
          = form_for user, url: role_user_path(user), method: :put do |f|
              - operation, activation, btn_class = user.has_role?(role) ? \
                %w(revoke active btn-success) : %w(grant inactive btn-danger)
              = hidden_field_tag :operation, operation
              = hidden_field_tag :role, role
              = f.submit activation, class: "btn \#{btn_class}"