Я добавил несколько драгоценных камней в gemfile
gem 'jquery-rails'
gem 'bootstrap-sass', '~> 3.4.0'
gem 'sassc-rails', '>= 2.0.0'
gem 'bootstrap-modal-rails'
упомянул их в application.js
//= require rails-ujs
//= twitter-bootstrap
//= require activestorage
//= require turbolinks
//= require jquery
//= require bootstrap-modal
//= require bootstrap-modalmanager
упомянул их в application.js
*= require_tree .
*= require_self
*= require bootstrap-modal-bs3patch
*= require bootstrap-modal
изменилтело application.html.erb
<body>
<%= render 'layouts/header' %>
<div class="page-wrap">
<div class="span9"><%= yield %></div>
<div id="modal-window" class="modal fade" role="dialog" data-backdrop="static" style="z-index: 9999;" ></div>
</div>
<div id="modal-window" class="modal fade" role="dialog" style="z-index: 9999;" ></div>
<%= render 'layouts/footer' %>
</body>
_load_user.html.erb
<div class="modal-header">
<div class="modal-window">
<button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button>
<h3 id="myModalLabel">Modal header</h3>
<div class="modal-body">
here comes whatever you want to show!
</div>
<div class="modal-footer">
<button class="btn" data-dismiss="modal" aria-hidden="true">Close</button>
<button class="btn btn-primary">Save changes</button>
</div>
</div>
</div>
load_user.js.erb
$("#modal-window").html("<%= escape_javascript( render "load_users") %>");
$("#modal-window").modal();
new.html.erb
<%= link_to 'Link' ,load_users_teams_path, remote: true %>
это решило мою проблему, фактически мой код в new.html.erb конфликтовал с файлом application.html.erb, а некоторые драгоценные камни отсутствовали