Ruby5 #587

https://ruby5.codeschool.com/episodes/630-episode-587-september-29th-2015

• Introducing Serial
  • Serial - lightweight serialization library
• Rails 5: ActionController
  • params.to_h
• gottfrois/link_thumbnailer
  • takes images from a given URL and generates thumbnail images
  • OpenGraph protocol
  • Find and sort images that best represent what the page
  • Find and rate description
• gottfrois/image_info
  • generates image data, including height, width, size, and image type

# actionpack/lib/action_controller/metal/strong_parameters.rb
def to_h
  if permitted?
    @parameters.to_h
  else
    slice(*self.class.always_permitted_parameters).permit!.to_h
  end
end