Hash to YAML - Used to convert hash to YAML and save in a fixture file.

hash_to_yaml.rb

#asumpution - Hash contains all keys as symbols
hash = {:post_id=>"11468",
 :post_title=>"Post with short sommary",
 :post_date=>{:year=>2016, :month=>4, :day=>29, :hour=>9, :min=>20, :sec=>12}}

#1. deep_stringify_keys! - Destructively convert all keys to strings. This includes the keys from the root hash and from all nested hashes and arrays.
hash.deep_stringify_keys!

#2. Write to file
file = 'path/to/output/file.txt'
File.open(file, 'w')  { |file| file.write( hash.to_yaml) }

#3. Read from yaml back to hash
hash = YAML.load(File.read(file))