Broadcasting is powerful, but it’s also easy to accidentally leak updates if everyone subscribes to a global stream. My default is to scope streams to a tenant boundary (like Current.account) and a resource. That means turbo_stream_from [current_accou

Turbo Drive records visits in browser history. For some interactions (like typing through search results), you don’t want every click to create a new history entry. Turbo supports data-turbo-action='replace' to replace the current history entry instea

Nested serializers display related data clearly but are read-only by default. To make them writable, I override create() and update() methods. For simple nesting, PrimaryKeyRelatedField or SlugRelatedField works well. For deeper nesting, I validate ne

A clean shutdown is part of reliability, not an afterthought. The pattern I like is: (1) start servers and workers, (2) listen for SIGINT/SIGTERM, (3) call Shutdown with a deadline, and (4) wait for background goroutines to finish. http.Server.Shutdow

I use ActiveSupport::CurrentAttributes any time I need request-scoped context without turning my app into a tangle of thread-local globals. In Current, I define the attributes I care about (member, request_id, remote_ip) and I use the resets hook to c

The default http.Server will happily keep connections open longer than you intended, which is how you end up with “mysterious” goroutine growth during partial outages. I set ReadHeaderTimeout to protect against slowloris-style attacks, keep IdleTimeou

When you need to call multiple downstream systems, errgroup is a great way to express “do these in parallel, cancel on first failure.” The key is using errgroup.WithContext, not a plain WaitGroup, so the group can propagate cancellation. Each goroutin

Noisy error reporting without context turns into a pile of untriaged alerts. I initialize Sentry early, set the release from the git SHA, and tag the environment so I can separate staging from production. I also set a sample rate and capture only what

Copy buttons are deceptively tricky across browsers. This Stimulus controller uses the Clipboard API when available, falls back to execCommand, and provides a hook for “Copied!” UI.

Proxy models create different Python behavior for the same database table. I set proxy = True in Meta. This adds methods or changes default ordering without new tables. Proxy models share the same table as the original. Use cases include different man

CORS configs have a habit of getting more permissive over time until you’re basically allowing any origin. I keep an explicit allowlist and handle credentials carefully. If you allow cookies, you can’t use * as the origin. I also keep preflight respon

Not every integration payload maps cleanly to a static struct. When I need to accept “mostly known” JSON but preserve unknown fields for auditing or forward compatibility, I use json.RawMessage. That allows me to decode the envelope (event name, versi