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Capybara

save_and_open_page

Matchers

have_button(locator)

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Setting up and installing rbenv, ruby-build, rubies, rbenv-gemset, and bundler

This guide enables you to install (ruby-build) and use (rbenv) multiple versions of ruby, isolate project gems (gemsets and/or bundler), and automatically use appropriate combinations of rubies and gems.

TL;DR Demo

# Ensure system is in ship-shape.

aptitude install git zsh libssl-dev zlib1g-dev libreadline-dev libyaml-dev

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# Simple JOIN
User.joins(:account)  # User -> Account
# Will produce
# SELECT `users`.* FROM `users` INNER JOIN `accounts` ON `accounts`.`user_id` = `users`.`id`

# Complicated JOIN
Trait.joins(:user => :account)  # Trait -> User -> Account
# Will produce
# SELECT `traits`.* FROM `traits` INNER JOIN `users` ON `users`.`id` = `traits`.`user_id` INNER JOIN `accounts` ON `accounts`.`user_id` = `users`.`id`