Unicode filenames on macOS can appear untracked in Git because the filesystem normalizes names differently; core.precomposeunicode and a newer Git version help prevent pathspec errors.

Ruby private does not make self methods or define_method methods private. Use private_class_method for class methods and private :foo for dynamic methods.

Firefox uploads stop working after a few megabytes, likely due to a browser issue. Using another browser avoids the failure as a temporary workaround.

Shared example groups need a clear home in RSpec, since the default rspec-rails layout does not provide one. Organizing them in dedicated shared_examples folders keeps them reusable and easy to load.

Render Rails views outside a request for PDFs, email attachments, or background reports using ApplicationController.render or render_to_string.

Long-term support fork of Ruby 1.8 that keeps receiving security updates for legacy systems.

Chrome DevTools can inspect and debug pages running on a mobile Android device from a desktop machine, preserving familiar tooling for on-device analysis.

Chrome WebInspector extension for debugging AngularJS apps and tracking down performance bottlenecks.

git clean -x removes ignored files from the working tree; -n previews changes and -xdf deletes ignored files and directories, including local config files.

Rails select helpers can disable specific options by value, preventing choice of unavailable entries in forms.

Capybara and Cucumber can verify that a select box includes a disabled choice, using an XPath check on the matching option element.

exception_notification can send error reports as simple HTML emails instead of plain text, improving readability while still including a text-only fallback.

exception_notification 4.0.0+ adds options to filter crawler noise and ignore selected exceptions, keeping alerts actionable instead of a stream of routine failures.

RubyMine may report false syntax errors, and resetting the IDE settings can clear the issue.

Need a simple way to fake server replies during development when external APIs are unavailable or unreliable.

Calendars often turn work into a chain of interruptions, leaving little protected time for deep focus. Intentional scheduling can restore control over the day.

Record-level permission checks can be optimized by replacing scope lookups with a direct predicate, avoiding database ID scans for large collections.

Programmers lose more time to meetings because creative work needs long, uninterrupted blocks, while manager-style schedules fragment the day.

Ruby’s dollar-prefixed globals can make obscure code hard to read; knowing ARGV, process status, PID, and regex match variables helps decode them.

Ruby 1.9 adds a compact -> syntax for lambdas, making anonymous function definitions shorter while staying equivalent to lambda { |x| ... }.

ActionController::CookieJar looks like a Hash, but slice fails when selecting cookie subsets because Hash#slice instantiates the wrong class.

Generate bounded integers in Bash using $RANDOM; simple modulus limits the range, but it biases results toward lower values.

Selenium tests can fail with ActionView::Template::Error and a dump format error for a symbol, often caused by stale cached files in tmp/cache.