Lazy High Charts: cannot get pie chart to show up - ruby-on-rails

Question

Following the directions here (and correcting for the tag issues in the code sample) I am attempting to implement a pie chart in my app. I load the initial page but the pie chart does not load on the partial (I make it into the html.erb file). A lot of things are hard coded right now so for instance Chart Type, etc do not get passed back to the controller yet.
Can someone help point out where I went awry?
Controller:
def dynamic_chart
#chart_types = ChartType.all
#user_visible_models = ["Asset","Asset Manufacturer","Asset Model", "Map","Campus","Tag","Room", "Room Monitor"]
#date_ranges = ["Day", "Week", "Month"]
end
def gen_chart
#rooms = Array.new
Room.all.each do |room|
#rooms << [room.name, room.asset_count]
end
#chart = LazyHighCharts::HighChart.new('pie') do |f|
f.chart({:defaultSeriesType=>"pie" , :margin=> [50, 200, 60, 170]} )
series = {
:type=> 'pie',
:name=> 'Asset by Rooms',
:data=> #rooms
}
f.series(series)
f.options[:title][:text] = "THA PIE"
f.legend(:layout=> 'vertical',:style=> {:left=> 'auto', :bottom=> 'auto',:right=> '50px',:top=> '100px'})
f.plot_options(:pie=>{
:allowPointSelect=>true,
:cursor=>"pointer" ,
:dataLabels=>{
:enabled=>true,
:color=>"white",
:style=>{
:font=>"13px Trebuchet MS, Verdana, sans-serif"
}
}
})
end
dynamic_chart.html.erb
<% javascript 'dynamic_chart' %>
<div id="graph_controls">
<%= form_tag('activate_reports/dynamic_chart', :class => "well form-inline") do %>
<%= text_field_tag(:name, nil, :class => "input-small", :placeholder => "Report Name") %>
<%= collection_select(:activate_report, :chart_type_id, #chart_types, :id, :name, :prompt => "Select chart") %>
<%= label_tag :x_axis, "X:", :class => "control-label" %>
<%= select :x_axis, nil, #user_visible_models, :prompt => true %>
<%= label_tag :y_axis, "Y:", :class => "control-label" %>
<%= select :y_axis, nil, #user_visible_models, :prompt => true %>
<%= select :date_range, nil, #date_ranges, :prompt => "Select a day" %>
<%= link_to("Chart!", "#", :remote => true, :class => "btn", :onclick => 'gen_chart()') %>
<% end %>
</div>
<div id="chart_area"></div>
_gen_chart.html.erb Partial:
<%= high_chart("chart_area", #chart) %>
gen_chart js function used to initiate the new chart
function gen_chart(){
jQuery.ajax({
url: "/activate_reports/gen_chart",
type: "GET",
data: {},
dataType: "html"
});
}