CodeSnips

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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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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Safe markdown rendering (remark + rehype)

Markdown is the sweet spot for user-generated content: expressive enough, but not a full HTML editor. The danger is letting raw HTML slip through. I use remark to parse markdown, then rehype to render HTML, and I disable raw HTML unless I have a sanit
by Mateo Rodriguez
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Django custom error pages (404, 500)

Custom error pages improve user experience and brand consistency. I create templates named 404.html, 500.html, 403.html, and 400.html in the templates root. Django serves these automatically when DEBUG=False. For custom logic, I can override error han
by Priya Sharma
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Django admin customization with ModelAdmin

The Django admin is powerful when customized. I set list_display for column layout, list_filter and search_fields for finding records. Using readonly_fields, I prevent editing certain fields. The fieldsets organize the form layout. For computed values
by Priya Sharma
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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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Django custom template filters for formatting

Custom template filters transform variables in templates. I decorate functions with @register.filter and optionally set is_safe=True for HTML output. Filters take one or two arguments. For formatting dates, numbers, or text, filters keep logic out of
by Priya Sharma
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GraphQL persisted queries (hash allowlist)

GraphQL endpoints can be abused with huge queries that are expensive to parse and execute. Persisted queries let clients send a hash (e.g. sha256:...) instead of the full query, and the server only executes queries it recognizes. This reduces payload
by Mateo Rodriguez
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Handle 401 responses in Turbo by forcing a full redirect

When a session expires, Turbo can end up swapping a login page into a frame, which is confusing. A practical fix is to detect 401 responses on the client and trigger a full-page visit (Turbo.visit) to the login URL. This keeps the app consistent and a
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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