rails

Serializing complex ActiveRecord objects to JSON can consume significant CPU time, especially when rendering collections with nested associations. Fragment caching stores rendered JSON fragments in Redis keyed by a cache key that includes the record's

Presence is usually overkill, but for collaboration features it’s valuable: show who’s online in a room. I identify connections with current_member in ApplicationCable::Connection, then in a channel I broadcast updates when members subscribe/unsubscri

If you store flags/settings in JSONB, query performance hinges on indexing. Partial indexes are a great compromise: index only the rows that matter for the hot path (e.g., enabled flags).

When a child record changes, you often want the parent cache key to change too. touch: true is a clean primitive for that. It keeps fragment caching sane without complex dependency graphs.

Normalize before validation to avoid “same email, different casing/whitespace” bugs. Keep normalization deterministic and small; put it in the model so imports, consoles, and controllers all behave the same.

Double-submits are easy to trigger on slow connections, especially with Turbo where the page doesn’t visibly reload. I add a Stimulus controller that listens to turbo:submit-start and turbo:submit-end events on the form. On submit start, disable the s

Autosave drafts without fighting Turbo: send a fetch request with CSRF token, keep it separate from the main form submit, and surface “Saved” status unobtrusively. This is a great fit for content editors.

If a feature is fundamentally “live” (comments, activity), I reach for model broadcasts. Rails can broadcast Turbo Stream fragments on after_create_commit, and the UI subscribes with turbo_stream_from. The beauty is that it’s still server-rendered HTM

ActiveStorage handles file uploads with cloud storage integration. It supports local disk, S3, Google Cloud Storage, Azure. Files attach to models via has_one_attached and has_many_attached. I use ActiveStorage for avatars, documents, images. Image va

Never subscribe clients to guessable user-specific streams. Use signed_stream_name so a user can only subscribe to their own broadcasts. This is essential when streaming private notifications.

Sometimes a form submission should update a specific section rather than navigate the whole page. With Turbo, this is as easy as setting data-turbo-frame on the form. For example, a filter form can target a results frame, so submissions replace only t

Simple disclosure components are everywhere: FAQ, details panels, advanced filters. I keep them as progressive enhancement: the HTML is valid and readable, and Stimulus adds toggling behavior. The controller toggles a hidden class and updates aria-exp