On: Show HN: Create Javascript charts with one line of Ruby

[swombat]

I'm kind of confused about the "group_by_day" type methods... where do those come from? I guess the app has to code them?

[akane → swombat]

Those are from groupdate. https://github.com/ankane/groupdate

[janerik → swombat]

There you go: https://github.com/ankane/groupdate