Spring can hide code changes while debugging Rails commands because it reuses a cached application process. Disabling it avoids stale behavior in rails and rake runs.

MenuetOS is a tiny 32/64-bit x86 operating system in assembly, fitting on a floppy and supporting GUI apps, USB, networking and SMP.

Rails generator creation and customization rely on Thor-based classes, template lookup, hooks, and customizable output for models and controllers.

Command-line interfaces can be defined in usage text and parsed automatically, avoiding handwritten option parsing and keeping help output as the source of truth.

Ruby exceptions form a hierarchy that determines what rescue catches by default and how errors like Timeout::Error changed between versions.

Keep table headings visible while scrolling large tables by cloning the header and syncing widths and horizontal position with jQuery.

Deterministic RGB colors from Ruby objects for labels, avatars, or grouping when the exact shade does not matter; Colorizer also generates similar hues with adjustable saturation and lightness.

Removing an item from a Restangular collection with _.without drops custom collection attributes like route, breaking later parent-based requests. splice keeps the array object intact.

Bot traffic can trigger ActionView::MissingTemplate by requesting bogus URL suffixes. Restricting allowed request formats application-wide prevents invalid format parameters from reaching controllers.

Bootstrap variables can be overridden to customize an application, and bootstrap-sass uses $ instead of @ for variable names.

Plain text in AngularJS can be rendered as paragraphs and line breaks while escaping HTML fragments, similar to Rails simple_format.

assignable_values can now validate virtual attributes, letting attr_accessor fields accept only approved values without custom validation code.

Command-line PDF printing is useful for batch jobs and headless systems, with lp sending files to the default or a chosen CUPS printer.

ActiveSupport String#camelize(:lower) turns snake_case into lowerCamelCase for JavaScript-style naming without custom string handling.

rake -W [substring_of_task] locates the source file and line for a Rake task when its definition is hard to find.

Prototype event handling on individual elements is brittle and breaks after AJAX replacement. Delegated document.on bindings keep change handlers working on dynamic content.

openssl s_client can verify whether a server supports Perfect Forward Secrecy by checking if a cipher handshake succeeds or fails.

Checks a server hostname for the Heartbleed vulnerability in OpenSSL (CVE-2014-0160).

A flaw in OpenSSL and SSL/TLS can expose protected data to attackers and leak secrets from encrypted internet traffic.

TextMate2 can misclassify Cucumber step definition files as plain Ruby, and fileType settings in .tm_properties assign them the correct syntax scope.

Generating PDFs in Rails often means choosing between text-based reports, HTML-to-PDF rendering, and different trade-offs in layout control and browser fidelity.

Integer-backed model attributes can be queried by symbolic names, making state handling clearer and avoiding hard-coded numeric values.

MariaDB 10 adds replication, NoSQL capabilities and sharding for web-scale workloads, bringing features developed with major high-traffic users into general availability.