<%= form_tag('/search', local: true, method: :get, class: 'form-inline' ) do %>
  <%= text_field_tag(:q, nil, data: { behavior: 'autocomplete' }, placeholder: 'Search', class: 'form-control mr-sm-2') %>
  <%= button_tag('Search', class: 'btn btn-outline-success my-2 my-sm-0', type: 'submit') %>
<% end %>