Is it possible to specify formatting options for to_yaml in ruby?

Question

The code

require \'yaml\'
puts YAML.load(\"
is_something:
  values: [\'yes\', \'no\']
\").to_yaml

produces

--- 
is_somethin         


        

Answer 1

Just another hack to specify the output style, but this one allows to customize it per specific object, instead of globally (e.g. for all arrays).

https://gist.github.com/jirutka/31b1a61162e41d5064fc

Simple example:

class Movie
  attr_accessor :genres, :actors

  # method called by psych to render YAML
  def encode_with(coder)
    # render array inline (flow style)
    coder['genres'] = StyledYAML.inline(genres) if genres
    # render in default style (block)
    coder['actors'] = actors if actors
  end
end