Why can't I parse YAML with Ruby?

Question

This is my Ruby code:

require 'yaml'
yaml = YAML.parse(
  '''
  foo: "hello, world"
  '''
)
puts yaml['foo']

I'm getting:

NoMethodError: undefined method `[]' for #<Psych::Nodes::Document:0x007f92a4404d98>

It's Ruby 2.1.3

Answer 1

You should use YAML.load instead of YAML.parse according to documentation to parse the YAML.

require 'yaml'
yaml = YAML.load(
  '''
  foo: "hello, world"
  '''
)
puts yaml['foo']

# => hello, world