Rails Background Jobs

Use this skill when the task is to add, configure, or review background jobs in a Rails application.

Core principle: Design jobs for idempotency and safe retries. Prefer Active Job's unified API; choose backend based on Rails version and scale.

HARD-GATE

EVERY job MUST have its test written and validated BEFORE implementation.
  1. Write the job spec (idempotency, retry, error handling)
  2. Run the spec — verify it fails because the job does not exist yet
  3. ONLY THEN write the job class

EVERY job that performs a side effect (charge, email, API call) MUST have
an idempotency check BEFORE the side effect.

EVERY perform method should do only three things:
  1. Load the record from the passed ID