<div class="field">
    <%= form.label :start %>
    <%= collection_select(:path, :start, Location.all, :id, :Name, prompt: true) %>
</div>

<div class="field">
    <%= form.label :end %>
    <%= collection_select(:path, :end, Location.all, :id, :Name, prompt: true) %>
</div>

<%= content_tag :div, class: "temp_information", data: {lat: @location.Latitude,long: @location.Longitude} do %>
<% end %>

<script>
map code
$('.temp_information').data('lat')
$('.temp_information').data('long')
</script>

alert(JSON.stringify(gon.paths))
alert(JSON.stringify(gon.path))