CODEWITHSUNDEEP
ruby-on-railsrubyparsinghashyaml
Croplio
Croplio

Reputation: 3583

How to parse a yaml file into ruby hashs and/or arrays?

I need to load a yaml file into Hash,
What should I do?

Upvotes: 43

Views: 55123

Answers (4)

Otheus
Otheus

Reputation: 1032

You may run into a problem mentioned at this related question, namely, that the YAML file or stream specifies an object into which the YAML loader will attempt to convert the data into. The problem is that you will need a related Gem that knows about the object in question.

My solution was quite trivial and is provided as an answer to that question. Do this:

yamltext = File.read("somefile","r")
yamltext.sub!(/^--- \!.*$/,'---')
hash = YAML.load(yamltext)

In essence, you strip the object-classifier text from the yaml-text. Then you parse/load it.

Upvotes: 5

Dessa Simpson
Dessa Simpson

Reputation: 1281

A simpler version of venables' answer:

hash = YAML.load_file("file_path")

Upvotes: 30

NullUserException
NullUserException

Reputation: 85458

Use the YAML module:
http://ruby-doc.org/stdlib-1.9.3/libdoc/yaml/rdoc/YAML.html

node = YAML::parse( <<EOY )
one: 1
two: 2
EOY

puts node.type_id
# prints: 'map'

p node.value['one']
# prints key and value nodes: 
#   [ #<YAML::YamlNode:0x8220278 @type_id="str", @value="one", @kind="scalar">, 
#     #<YAML::YamlNode:0x821fcd8 @type_id="int", @value="1", @kind="scalar"> ]'

# Mappings can also be accessed for just the value by accessing as a Hash directly
p node['one']
# prints: #<YAML::YamlNode:0x821fcd8 @type_id="int", @value="1", @kind="scalar">

http://yaml4r.sourceforge.net/doc/page/parsing_yaml_documents.htm

Upvotes: 12

venables
venables

Reputation: 2594

I would use something like:

hash = YAML.load(File.read("file_path"))

Upvotes: 118

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