Ask HN: Generate a bunch of demo data from a scheme?

Hello,

I saw on Hacker News a script that generates demo data based on the type you request, so if you need a first name you called ->first_name or something and it made one.

Does anyone remember what it is called?

If not does anyone know of a good script to allow me to generate demo data for a presentation that would include all the basic profile(first name, image, last name, age, etc)/post(title, body, lorum ipsum, etc) types of data?