title: Chartkick graph keeps loading
body: <p>I'm trying to display a simple graph with Chartkick. I've installed the gems chartkick, groupdate, and active_median. I have a model (Client) that I want to test on the graph so I tried it using this line:</p>
  
  <pre><code>&lt;%= line_chart Client.group_by_day(:created_at), id: random_chartkick_id %&gt;
  </code></pre>
  
  <p>In my helper I have this method to generate a random ID for the chart</p>
  
  <pre><code>def random_chartkick_id
    return 'chart-#'+(Random.rand(10000)).to_s
  end
  </code></pre>
  
  <p>I'm using google's jsapi via cdn: </p>
  
  <pre><code>&lt;%= javascript_include_tag "http://www.google.com/jsapi", "chartkick" %&gt;
  </code></pre>
  
  <p>However, the chart just says "loading". When I type a random number in the data field for creating the chart I get an empty chart. 
  What am I doing wrong? Thanks</p>