Clicking arbitrary page text can target any HTML element with a JavaScript handler, not just links or buttons, in Selenium features.

Account profiles now provide a personal RSS feed with the newest public and private cards across all decks.

Short code snippets can be misclassified by automatic syntax highlighting; explicitly declaring the language or using text avoids wrong highlighting or disables it.

Bundler can fail on fresh Ubuntu installs with no such file to load -- net/https when Ruby lacks OpenSSL bindings, blocking gem downloads.

Dynamic Ruby methods can return false negatives with respond_to?, breaking gems and method lookups unless respond_to_missing? matches method_missing.

Textarea resizing in Chrome, Safari, and Firefox can disrupt layouts; limiting maximum width and height keeps the box controlled while still allowing optional user resizing.

Reusable Gherkin steps can be chained inside a new step definition with steps or step, but steps only processes lines starting with Gherkin keywords.

RabbitMQ plugins on Ubuntu 12.04 require the full rabbitmq-plugins path because the binary is not in the default PATH.

Run an older Bundler release for compatibility when Rails or another project is pinned to a specific gem version.

Rails 3.1 lets a single change migration run forward and backward automatically, while irreversible updates are skipped during rollback.

Stop the terminal from jumping back to the bottom when new output appears, so you can inspect logs or test failures without losing your place.

Final bugfix release for Ruby 1.8.7, with another year of security fixes before patches end.

Testing a gem across Rails versions is easier with shared app code and specs via symlinks, keeping one test setup aligned with current best practice.

has_defaults is now a standalone gem; the old plugin is gone and plugins are unsupported in Rails 3.2+.

APT fails with 404 errors from an Ubuntu mirror while the network and server are fine; deleting the local package lists cache restores updates.

Moderately complex authorization rules often need CRUD action mapping in controllers; Consul 0.3.0 adds :crud as a shortcut for the common edit/create/destroy mapping.

rails_admin specs can pass with rspec but fail under rake spec; setting ENV['SKIP_RAILS_ADMIN_INITIALIZER'] = 'false' in spec_helper restores the initializer.

Puppet catalog compilation can fail with ArgumentError: Invalid resource type when plugin sync or environments are misconfigured. Missing Ruby files in /var/lib/puppet/lib can trigger the error.

Find the currently logged-in Linux user with whoami; use it in .bashrc to set different Bash prompts for root and normal users.

class_attribute behavior in Rails can differ from the removed class_inheritable_attribute, especially when inheritable class state is needed across subclasses.

Rack can reject large nested forms by miscounting input fields against its parameter limit, causing low-level Ruby errors or Rails error pages.

RSpec be_false matches nil, so a false check can pass unexpectedly. Use == false when the value must be exactly false.

Rails autoloading can surface a misleading Expected foo_trait.rb to define FooTrait error after a mistake in an unrelated trait, making the real failure hard to locate.