CodeSnips

rails

Database migrations and schema management

Rails migrations evolve database schema over time. I use change method for reversible migrations. Migrations create tables, add/remove columns, add indices. up and down methods provide explicit control. Irreversible migrations like data transformation
by Sarah Mitchell
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Turbo Streams: append server-side validation warnings

Sometimes you want to show non-blocking warnings (e.g., “link looks unreachable”) while still saving. Turbo streams can append warnings to a panel without rerendering the whole page.
by Sarah Chen
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Lazy-load heavy panels with IntersectionObserver + Turbo frame

Not every part of a page needs to load immediately. For heavy panels (analytics charts, audit logs), I use a Turbo Frame with src and a tiny Stimulus controller that sets the src when the element becomes visible via IntersectionObserver. This avoids f
by Henry Kim
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ActiveJob for queue adapter abstraction

ActiveJob provides a unified interface across different queue backends (Sidekiq, Resque, Delayed Job), making it easier to switch adapters or test jobs. I define jobs by inheriting from ApplicationJob and implementing perform. ActiveJob handles serial
by Alex Kumar
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Optimistic Locking for Collaborative Edits

If multiple admins edit the same record, use lock_version. Rails will raise on conflicting updates, and you can show a friendly “this changed underneath you” message. It prevents subtle lost updates.
by Sarah Chen
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Turbo Streams: update document title with a custom action

Sometimes the DOM updates but the browser tab title stays stale (e.g., unread count, active chat room). A neat Hotwire trick is a custom Turbo Stream action that sets document.title. The server emits a <turbo-stream action='set_title'> with a te
by Henry Kim
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Database view-backed models for complex queries

Complex reporting queries with multiple joins and aggregations can become unmaintainable in ActiveRecord. PostgreSQL views encapsulate query complexity in the database layer and appear as regular tables to Rails. I create views for common reporting ne
by Alex Kumar
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Deterministic Cache Keys for Collections

When caching lists, include inputs that change the list (filters, page, member permissions). A deterministic cache key function prevents subtle “wrong user saw wrong list” bugs.
by Sarah Chen
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ActiveRecord callbacks for lifecycle hooks

Callbacks hook into the ActiveRecord lifecycle to execute code before or after operations like create, update, or destroy. I use before_validation to normalize data (like downcasing emails), after_create to trigger welcome emails, and before_destroy t
by Alex Kumar
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Infinite scrolling list using lazy Turbo Frames

Turbo Frames can implement infinite scrolling without a JS router. I render the first page normally and append a “next page” frame at the bottom with loading: :lazy. When the user scrolls and the frame enters view, Turbo fetches the next page automati
by Henry Kim
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Render without layout for Turbo Frame requests

A classic Turbo foot-gun is returning a full layout inside a frame, which results in nested <html> and weird styling. The simplest fix is layout -> { turbo_frame_request? ? false : 'application' } at the controller level. I use this when I ha
by Henry Kim
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Safer “find or create” with Unique Constraint + Retry

Race conditions happen. The correct “find or create” in production uses a unique constraint and a retry on conflict, not a naive check-then-insert. Let the database serialize the race.
by Sarah Chen
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