Chartjs-Chart.js not rendering chart with data from mySQL database

Your data is in the wrong format, you are pushing it into an array, but it needs to be comma separated values:

data: 20, 5, 34, etc ....

So in this part of your code:

var rating = [];
for(var i in data) {
    rating.push(data[i].ratingid);
    variety.push(data[i].variety);
    ...
  }

It should be:

var rating; // set to string, not array

rating = rating + data[i].ratingid + ',';

Or if it’s a string:

rating = rating + "'" + data[i].ratingid + "',";

Hope that helps.