javascript - ruby on rails: leaflet-rails not loading -

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using ror 4.1.4

i trying use leaflet-rails gem. followed steps outlined in github page, when try load map, see 

referenceerror: l not defined

in browser console. means helper gem being loaded , executed can't find leaflet.js file.

however, head section of page shows /assets/leaflet.js being referenced , there.

when @ generated code:

    <div id="map"></div>     <script>     var map = l.map('map')     map.setview([-54.0, 6.08], 16)     l.tilelayer('http://{s}.tile.osm.org/{z}/{x}/{y}.png', {               attribution: '&copy; <a href="http://osm.org/copyright">openstreetmap</a> contributors',               maxzoom: 18,     subdomains: '',     }).addto(map)     </script>   </div>   <script src="/assets/jquery.js?body=1" data-turbolinks-track="true"></script>   <!-- other scripts loaded -->   <script src="/assets/exif.js?body=1" data-turbolinks-track="true"></script>   <script src="/assets/leaflet.js?body=1" data-turbolinks-track="true"></script>   <!-- more scripts -->

so gem adds script right below map div, , then, due sprockets mechanism , that, other scripts loaded. me looks script can't possibly load leaflet.js it's being referenced afterwards!

so...am misunderstanding re how ror handles gems , javascripts? must have been working @ point...

here's /app/assets/javascript/application.js:

//= require jquery //= require jquery.ui.widget  // here load whole bunch of javascripts related jquery-fileupload, cut brevity //= require bootstrap.min //= require bootbox.min  //= require bootstrap-datepicker  //= require exif  //= require leaflet  //= require turbolinks //= require_tree .

turns out maybe ror specific issue.

many sites recommend put 

<%= javascript_include_tag 'application', 'data-turbolinks-track' => true %>

line loads javascripts, @ end of file, in order speed page display. leaflet-rails gem, isn't great, , generate problem described above. if putting same line in <head> section, problem goes away...

p.s. still have problems gem though, 

error: no value provided variable {s}

if substitute "http://{s}.tile.osm.org/{z}/{x}/{y}.png" "http://a.tile.osm.org/{z}/{x}/{y}.png" works...don't think it's meant work way though...but that's different issue...


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