.dropdown.checkboxes-dropdown
  button(
    class       = "btn btn-default dropdown-toggle"
    type        = "button"
    data-toggle = "dropdown"
  )
    = label
    = " ("
    span.number
    = ") "
    span.caret

  .dropdown-menu: .container-fluid
    = f.input input, collection: collection, as: :check_boxes, label: false