score:2

Accepted answer

turns out that:

i needed to add

 //= require highcharts/modules/heatmap

to my application.js i thought it was a redundant inclusion, but apparently it's not.

also the gem readme, at: https://github.com/perfectlynormal/highcharts-rails mentions to install: gem "highcharts-rails", "~> 3.0.0" but 3.0.0 is not the latest version, i updated the gem inclusion to: gem "highcharts-rails", "~> 4.1.9", which is currently the latest, and the problem seems fixed.

even removing completely the version specification would work:

gem "highcharts-rails"

getting the project to use the latest version.

i'm going to make a pull request to update the readme.


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