Last Updated: 2021-05-15
I added some development seed data to my Rails app and I was unsure whether to manually make just a pair instances for each class (and therefore have super simple seed code) or to produce a large set of data .
It turns out, the downside with having just 2-3 records is that performance is difficult to get a feel for. All DB queries seem optimized, both in terms of feel (browsing the development environment is super snappy) and with automated tools like Bullet which fail at spotting N+1 issues since, well, there is no N!
Therefore, in future (and for relatively mature apps), generate a few thousand records to get a realistic feel.