app/views/admin/reports/graphs/index.html.erb
<% content_for :head do -%>
<%= javascript_include_tag 'admin/reports/weekly_chart' %>
<% end %>
<h2> Weekly Charts </h2>
<h3> Sales </h3>
<div id="weekly-sales-graph" style="height: 250px;"></div>
<h3> Earnings </h3>
<div id="weekly-earnings-graph" style="height: 250px;"></div>