app/views/shared/meter_attributes/_new_select.html.erb
<%= form_tag create_path, method: :get do %>
<%= select_tag :type, options_for_select(available_meter_attributes.map{|id, attribute_type| [attribute_type.attribute_name, id]}.sort_by(&:first))%>
<%= hidden_field_tag(:meter_id, meter_id) if local_assigns[:meter_id] %>
<%= submit_tag 'New attribute', class: 'btn btn-sm'%>
<% end %>