app/views/modules/metric_history.js.erb
<% cache("#{@module_result.id}_#{@metric_name}") do %>
<% metric_history = @module_result.metric_history(@metric_name) %>
var dates = [];
var values = [];
<% metric_history.keys.each do |date| %>
dates.push("<%= date.to_s[0,10] %>");
values.push(<%= metric_history[date] %>);
<% end %>
$("#loader_<%= @container %>").hide();
$("canvas#<%= @container %>").show();
Module.Graphic.display(dates, values, '<%= @container %>');
<% end %>