Ruby's pessimistic operator and locking gem versions

"~>"によるバージョン指定だとgem開発者の開発方針によってはうまくいかないのでGemfileでバージョンを指定しておくべき／Gemfile.lockはあくまで結果を表すだけであって開発者の意図を反映しているものではない / “Ru…”

source 'https://rubygems.org' ruby '1.9.3' gem 'bootstrap-sass', '2.1.0.0' gem 'clearance', '1.0.0.rc1' gem 'delayed_job_active_record', '0.3.2' gem 'fog', '1.5.0' gem 'formtastic-bootstrap', '2.0.0' gem 'haml', '3.2.0.beta.3' gem 'high_voltage', '1.2.0' gem 'jquery-rails', '2.1.1' gem 'nested_form', '0.2.2' gem 'newrelic_rpm', '3.4.1' gem 'paperclip', '3.1.4' gem 'pg', '0.14.0' gem 'rails', '3.2.8' gem 'thin', '1.4.1' gem 'will_paginate', '3.0.3' group :test do gem 'bourne', '1.2.0' gem 'database_cleaner', '0.8.0' gem 'capybara-webkit', '0.12.1' gem 'factory_girl_rails', '4.0.0' gem 'launchy', '2.1.2' gem 'shoulda-matchers', '1.2.0' gem 'timecop', '0.4.5' end group :development do gem 'foreman', '0.56.0' gem 'mail_view', '1.0.3' end group :development, :test do gem 'rspec-rails', '2.9.0' end group :assets do gem 'asset_sync', '0.4.2' gem 'coffee-rails', '3.1.1' gem 'sass-...

Full article: http://robots.thoughtbot.com/post/2508037841/rubys-pessim...