Pending RSpec examples need a failing body; otherwise a passing pending example is treated as a failure. Omit the body, add fail, or skip with xit/xdescribe.

1.year returns a Float in Rails < 4 and can break code that expects an integer duration; Rails 4 uses ActiveSupport::Duration instead.

Using application or provider names in variable and method names makes code brittle during replacements and extensions; abstract, reusable names reduce renaming and adaptation work.

Katapult 0.4.0 adds application-model associations and can generate a project README for Rails-style project scaffolding.

Pending Cucumber steps can fail when VCR cassettes contain unused HTTP interactions; @allow_unused_http_interactions can be enabled only for pending features.

Katapult 0.3.0 adds Rails 5.1.4 and Ruby 2.5.0 support, a new Bootstrap-based design, Webpacker, and workflow and test improvements.

all? returns true on empty collections, which can accidentally match missing associations and lead to unwanted deletions or other false positives.

Move a repository between Git hosts without losing branches, tags, or untracked commits. Mirroring the old remote to the new one keeps the destination in sync.

Capybara step for checking an image by matching part of its src against a filename and extension during browser tests.

Rails constant loading can fail silently in development, especially with threaded code. Logging ActiveSupport::Dependencies helps trace autoloader behavior and diagnose hangs.

Updating several columns from multiple related tables in PostgreSQL can be awkward without the right UPDATE ... FROM pattern and join conditions.

CSS sprites can reduce image requests by bundling small backgrounds into one sprite; Compass and compass-rails automate sprite generation in Rails apps.

PostgreSQL json fields store flexible data, but Rails lacks built-in querying sugar. Matching nested values requires manual SQL operators and text extraction.

Font Awesome 5 changes icon names and adds fab, far, and fas prefixes; a JavaScript shim can preserve v4 names during migration.

contain_exactly checks whether an ActiveRecord relation has the expected records, and splatting an AssociationRelation makes the matcher work as intended.

Prevent duplicate event callbacks in jQuery by using .one() for single-fire handlers or off()/on() with the same function reference.

throw and catch provide a way to exit multiple nested loops early when a result is found, complementing Ruby’s return, break and next flow control.

Create mass letters in LibreOffice Writer by using a spreadsheet as an address source and inserting mail-merge fields; the built-in wizard is unreliable and may crash.

Rails 5 upgrade can fail when the database schema lacks configured environment data, especially during parallel test database migration.

LoDash chaining differs from UnderscoreJS: _ methods may return wrapper objects, and value() ends a chain. The compatibility build can mimic Underscore behavior.

Blank spreadsheet cells in LibreOffice Calc are hard to target with normal search; regular expressions let Find & Replace match them reliably.

Curl sends and stores no cookies by default; -c and -b let you save, reload, or manually supply them for repeated requests.