A Git alias can push a branch to GitLab and create a draft merge request automatically, with an optional target branch override.

Chrome DevTools can store a selected DOM element as a global variable for quick inspection and reuse in the console.

Overriding initialize in ActiveType::Object can break ActiveRecord-style setup, freeze instances, or cause argument errors unless super is called with one attribute hash.

Bundler can fail to fetch gems from rubygems.org when IPv6 connectivity is broken. Lowering IPv6 priority in /etc/gai.conf can let bundle install succeed temporarily.

Flaky integration tests can outrun watchInputDelay, causing Unpoly field updates to overwrite typed input before requests start. Lowering the delay or signaling CapybaraLockstep reduces failures.

Rails 7+ validates dates, numbers and strings with ComparisonValidator for greater-than and less-than checks, replacing custom comparison code.

Strong Parameters for CarrierWave uploads need more than the file field; cache and removal flags keep images across validation errors and enable deletion.

Safer branch navigation in Git benefits from git switch, a clearer alternative to git checkout for changing, creating, and detaching branches.

Finds large files and directories consuming disk space on servers or minimal systems with a text-based interface.

MySQL treats 0 = 'any string' as true, so mixed string-integer comparisons can match unexpected rows and bypass indexes; PostgreSQL rejects such comparisons.

wkhtmltopdf can fail with ProtocolUnknownError when file:// URLs are blocked by default, preventing local assets such as stylesheets from loading.

robots.txt can block crawling without removing URLs from search results, while noindex removes accessible pages from indexing. Disallowed URLs may still appear as search matches.

Unique scratch directories prevent flaky tests and stale files in parallel Ruby test runs. Dir.mktmpdir creates them safely and can use a custom base path.

Recover the change history of a deleted file in Git by using git log with history-preserving flags across all references.

Rails 6+ adds before? and after? for comparing dates and times; between? checks whether a value falls within a range.

Growing memory usage in Ruby and Rails can exhaust a process and cause crashes; ObjectSpace.count_objects helps identify leaking object types, and derailed_benchmarks can aid diagnosis.

Rails models often need exactly one of several attributes filled in; built-in validations do not handle this XOR case cleanly. A custom ActiveModel::Validator can enforce blank-or-singleton presence with clear errors.

Convert SVG files to PS, PDF, or EPS without Inkscape using CairoSVG and ps2eps; it is lightweight, fast, and works from files or stdin.

Rails controllers can stay short, testable and authorization-friendly by using a minimal shared blueprint for CRUD, strong params, scopes and optional HTTP caching.

@{-1} resolves to the previous branch name, including when git merge - uses the last checked-out branch.