Rorschart ยท 
Rorschart is a Ruby library that interprates common Ruby and Activerecord data structures for you to generate beautiful Javascript Google Chart.
- Multi-series charts directly from yours ActiveRecord queries
- Works with all Google Charts
- Detects appropriate data type to customize axes labels
- Supports asynchonous ajax data generation
- Rorschart knows how to draw charts from Array, Hash, Array of Array or Hash, ActiveRecord::Relation...
Checkout the demonstration page.
Designed to be the perfect companion to Snowplow-dashboard.
License
Distributed under the MIT license.