ruby:
  raise 'Form parameter is required' if form.blank?

  attribute ||= nil  # attribute name that the editor should be attached to
  collection ||= nil
  value_method ||= nil
  text_method ||= nil

  options = {}
  html_options = {class: 'form-control bs-multiselect', multiple: "multiple"}

div
  = form.collection_select attribute, collection, value_method, text_method, options, html_options