Custom .irbrc files can make irb and the Rails console more useful with extra methods, nicer printing, editor integration, and app-specific prompts.

Rough JavaScript equivalent of Rails simple_format for turning plain text into HTML paragraphs and line breaks. Whitespace preservation is not included.

Capistrano deployment warnings can appear when Rails asset pipeline apps lack empty public subdirectories. Placeholder files like .gitkeep suppress the missing-path errors.

ActiveRecord::Base#becomes leaves changed attribute tracking inconsistent, which can break attribute_was checks after casting models with defaults. ActiveType.cast is often the safer alternative.

Constrain a Rails route to a single response format such as XML when one URL must serve only that representation.

Rails 2.3.10 deprecation warning for url_for :overwrite_params when generating links with replaced query values. params.merge supplies the full parameter set and avoids the warning.

Ruby Pathname objects can build file paths with :/ or join, making path concatenation in Rails more concise and readable.

ActiveSupport deprecation warnings can be selectively hidden when a specific warning cannot be fixed and only certain messages should stay visible.

Displays the app name and Rails environment in the console prompt, reducing the risk of running commands in production by mistake.

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

A couple of Railsconfs ago, Courtenay and I did indeed discuss

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.

Human-friendly list formatting in JavaScript is awkward; joinSentence produces an Oxford-comma sentence from array items, similar to Rails to_sentence.

JavaScript can break in Internet Explorer only after Rails asset compression in staging or production. Switching from UglifyJS to YUI Compressor can avoid these failures.

Authenticated pages can be benchmarked with ab by supplying the right session cookies; otherwise login-protected requests fail or measure the wrong content.

Use SQL views in a Rails app without switching the schema format to SQL; Scenic adds versioned, reversible migrations and keeps view definitions in SQL files.

Feature and spec code may need different behavior when Rails env is unavailable. Capybara.current_driver can distinguish Cucumber scenarios from RSpec examples.

Open a MySQL prompt without retyping database credentials by using dbconsole with the password flag, optionally for another Rails environment.

Backport Rails 3 ActiveRecord querying and chained scopes to Rails 2, including where, order, and to_sql for scopes.

Alternative form objects for Rails may fit better than model-based validation and could become part of Rails 5.

Adds compatibility with Rails 4.1 and Ruby 2.1, including a forward port of ActiveRecord::Base.scoped for newer Rails versions.

Rails logs can be silenced completely in a specific environment by replacing the logger with Logger.new('/dev/null').

Caching in Ruby on Rails reduces repeated work and speeds up pages, but stale or fragmented cache data can hurt performance and correctness.

Ruby on Rails 4 adoption will require updates for many web applications. A 31-day series prepares developers for a smoother upgrade.