Every Rails developer makes that mistake once (well, hopefully not more than once). What I'd really like to see next is a way to version seeds.rb.

@Jarin I've been thinking about versioning seeds or at least being able to alter / update in place seeds. Did you have any thoughts on how you would like the versioning to work?

git?

seeds.rb isn't intended to be run more than once on a particular database instance. Running it more than once results in duplicate entries, unless you're explicitly checking for dupes (not always possible).

It looks like seedbank is fairly close to what I want though, as it lets you maintain multiple sets of seeds: https://github.com/james2m/seedbank