How do I parse a YAML file in Ruby?

I would like to know how to parse a YAML file with the following contents: --- javascripts: - fo_global: - lazyload-min - holla-min Currently I am trying to parse it this way: @custom_asset_packages_yml = (File.exists?("#{RAILS_ROOT}/config/asset_packages.yml") ? YAML.load_file("#{RAILS_ROOT}/config/asset_packages.yml") : nil) if !@custom_asset_packages_yml.nil? @custom_asset_packages_yml['javascr