rails

Deadlocks happen under load. When the operation is safe to retry, rescue the deadlock exception and retry with jitter. Keep retries bounded and log when it happens.

Kredis provides typed Redis structures as Active Model attributes, simplifying common patterns like counters, flags, and lists. Instead of raw Redis commands, I define kredis accessors on models that handle serialization automatically. Counters track

Network failures and client retries can cause duplicate request processing, leading to duplicate charges, double-created resources, or inconsistent state. Idempotency keys solve this by tracking processed requests and returning cached responses for du

Ruby modules enable code sharing across classes without inheritance. I use include for instance methods, extend for class methods. prepend inserts module before class in method lookup. Concerns organize shared behavior—validations, scopes, association

Strong parameters prevent mass assignment vulnerabilities by explicitly permitting allowed attributes. For nested associations like a post with embedded images or comments, I use nested permit calls. Arrays of primitives use [] syntax, while hashes of

Sometimes you need a one-time maintenance operation outside normal schema changes. Use a small table to track “run once” tasks so reruns are safe and the operation is visible.

Emails should be idempotent. Store a delivered marker (or unique key) so retries don’t spam users. This pattern is especially useful for receipts and password reset flows.

Toasts are a great fit for Turbo Streams because they’re ephemeral UI that doesn’t need a dedicated page. I keep a #toasts container in the layout and turbo_stream.append a toast partial on success events. The toast itself is just HTML with a Stimulus

When appending new content (like a new message), I sometimes want to scroll it into view automatically. Rather than adding JS in the controller, I use a custom turbo stream action scroll_into_view that finds the target element and calls scrollIntoView

I wrapped external HTTP calls once I realized most “flaky APIs” were actually my fault: no timeouts, unclear retries, and logs that didn’t tell a story. In Client with timeouts, I centralize a Faraday connection with explicit open_timeout and timeout,

Moving slow operations to background jobs keeps API response times fast and improves perceived performance. Sidekiq with Redis provides a robust, production-proven job queue that handles millions of jobs per day. I organize workers into separate queue

For apps that ingest emails (support inbox, replies), Action Mailbox is a natural fit. When a message arrives, I create a record and broadcast it into a Turbo Stream feed so the UI updates in realtime. This is essentially “email as an event source”. T