https://github.com/ankane/groupdate (by the same author) makes it simple to output the right JSON grouped by date (awesome!)
Highcharts/Google charts make it simple to turn json into JS graphs.
This library provides glue so you don't have to read the highchart docs. Might save some people some time, I guess...
My favorite part about the library is you don't need to worry about getting the data in correct format. It just works with existing Rails methods, like ActiveRecord's count.
Also, Google Charts look a lot better with a little bit of custom styling.
"This looks nice, but most of the hard work is done elsewhere."
What were you expecting?
The original title is 'Create beautiful Javascript charts with one line of Ruby', which is more accurate.