Alex Peachey questions

Alex Peachey answers

• Can I make an array of links using link_to in Rails?
• Should I move my custom methods to model from controller?
• Using url_for in Rails/Capybara/Poltergeist spec sends the driver to example.com instead of the app
• How do I count items in an array that have a specific attribute value?
• Get changed attributes on after_update callback
• How do I test for non-null in Ruby::Sequel?
• Rails 3: validate presence of at least one has many through association item
• What is the difference between Ruby's 'open-uri' and 'Net:HTTP' gems?
• Retrieve a list of all keys stored in Redis (Ruby)
• Rails generate has_many association