New on the blog: Seeding Your Database the Idempotent Way. <https://blog.wheels.dev/posts/idempotent-database-seeding/> What it covers: •

seedOnce()

— the idempotent seed helper. Create a row only if a matching one doesn't already exist; safe to run a hundred times. • The file convention:

app/db/seeds.cfm

(runs in every environment) then

app/db/seeds/<env>.cfm

(env-specific, sibling directory — NOT a hyphenated suffix). • Why the whole run is one transaction that rolls back on ANY validation failure (#2973) — a half-applied seed run must never look fully-applied. • Composite uniqueness, seeding from code via

application.wheels.seeder

, and the CLI:

wheels seed

, scaffold with

wheels generate snippets seed-data

. • Sharp edges: it's a skip not an upsert,

--generate

is random non-idempotent junk, and

wheels db:seed

/

wheels generate seed

are not real commands.