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Configuration
- id: jobs/idempotent-workers
description: >
Background workers that make external
side effects must be idempotent.Pull request
def perform(order_id):
order = Order.find(order_id)
payment_provider.capture(order.card)
order.update!(charged: true)
✕ jobs/idempotent-workers
This worker is not idempotent. The external charge happens before the local record is marked as charged. A retry after a successful capture can charge the customer twice.