Use request-specific view paths to swap in alternate templates for selected conditions, with fallback to the default templates when no override exists.

Generate polished Git commit messages from Linear stories, including issue ID, title, and link, using geordi commit and a .geordi.yml repository config.

Cross-origin browser requests need explicit server approval; otherwise the Same-Origin Policy blocks access. CORS uses Origin and Access-Control-Allow-Origin headers, with preflight checks for some methods.

Strict loading in index actions catches N+1 queries when views touch unpreloaded associations, causing test failures instead of hidden database hits.

Rails response tests can parse bodies by MIME type with parsed_body, replacing manual JSON.parse(response.body) in many cases and enabling cleaner assertions.

Prevent race conditions when multiple Ruby processes read or write the same file by using flock for exclusive locking, optionally via a companion .lock file.

@extend reuses Sass selectors, but multi-file bundling can duplicate imported styles and break the expected selector merging.

Template and eval coverage in Ruby can be tracked with SimpleCov from Ruby 3.2 onward, including Haml and ERB templates.

FactoryBot transient attributes can pass custom values into associated records, letting parent factories build children with dynamic names and flags.

Rails migrations can change column types without dropping data by using custom SQL casting, but rollback may fail when values cannot be converted.

Create tiny test videos with ffmpeg by lowering resolution, framerate, and bitrate to keep files small while preserving duration.

Capistrano deployments can fail with ssh-ed25519 keys because net-ssh needs ed25519 and bcrypt_pbkdf; stale host fingerprints in ~/.ssh/known_hosts can also block access.

Personal issue workflow checklist for moving features from start to review, with branch, commit, merge request, testing, and staging handoff steps.

Boolean fields in Rails are safer with database defaults and NOT NULL constraints; application-level fallbacks are brittle, especially for tri-state values and instance-dependent defaults.

Gem installations waste time generating local docs that are rarely used; disabling documentation by default speeds up manual installs with gem and ~/.gemrc.

External images in emails can fail in some clients; inline attachments with Rails and attachments.inline keep images visible, but turn messages into multipart emails and use content IDs.

Rails 7 app data can be stored as encrypted attributes with deterministic lookup support, but search, grouping, and bulk updates become limited.

Find the gem version that first contains a commit by using git name-rev --tags; it points to the next release tag after the change.

Controllers can call view helpers in Rails 5+ through helpers, while older Rails versions use view_context to reach methods like link_to.

Loading large page images only when they enter the viewport cuts bandwidth use and can improve perceived speed. Missing crawler support and layout shifts remain common issues.

Early browser hints can reduce page load latency by preparing DNS lookups and connections before navigation.

Rails JSON serializes times with milliseconds, so iso8601 and to_json can differ in RSpec expectations. Using to_json keeps time string comparisons matching.

A stuck Rails development server can keep port 3000 busy and trigger EADDRINUSE; lsof and kill -9 can force it down.