Ruby on Rails中的morris.js錯誤

Question

我在嘗試在我的Ruby on Rails項目中使用morris.js時出現錯誤。

Uncaught TypeError: Cannot read property 'length' of undefined 

這是我的文件

= content_tag :div, "", id: "weights_chart", data: {weights: @weights} 
:javascript 
    new Morris.Line({ 
     element: 'weights_chart', 
     data: $('#weights_chart').data('weights'), 
     xkey: 'created_at', 
     ykey: ['data'], 
     labels: ['Weight'] 
    }); 

Answer 1

ykey應該是ykeys最有可能的。