controller.rb

@paper_totals_by_client = Paper.past_pending
                               .joins(:client)
                               .group("clients.name")
                               .limit(5)
                               .count

# returns an object like the following:
# => {"Sample Business"=>1, "Sample Business 2"=>1, "Sample Business 3"=>1, "Sample Business 4"=>6}

show.html.erb

<script type="text/javascript" src="https://www.google.com/jsapi"></script>
<script type="text/javascript">
  google.load('visualization', '1.1', {packages: ['corechart', 'timeline']});
  
  google.setOnLoadCallback(drawChart);
    function drawChart() {
      var clientPaperCountChart, clientPaperCounts, clientPaperCountData, clientPaperCountOptions;
      clientPaperCounts = $.parseJSON("<%= j raw @paper_totals_by_client.to_a.to_json %>");
      clientPaperCounts.forEach(function(element, index, array) {
        array[index].push('color: #3b8eb4; opacity: 0.5');
      });
      clientPaperCounts.unshift(['Client Name', 'Papers', {role: 'style'}]);

      clientPaperCountData = google.visualization.arrayToDataTable(clientPaperCounts);

      clientPaperCountOptions = {
        title: "Papers by Client (Top <%= j @paper_totals_by_client.length.to_s %>)",
        width: 400,
        height: 300,
        legend: { position: "none" }
      };
      clientPaperCountChart = new google.visualization.BarChart(document.getElementById('client_paper_count_chart'));
      clientPaperCountChart.draw(clientPaperCountData, clientPaperCountOptions);
    }
</script>