Ruby yaml custom domain type does not keep class -

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i'm trying dump duration objects (from ruby-duration gem) yaml custom type, represented in form hh:mm:ss. i've tried modify answer this question, when parsing yaml yaml.load, fixnum returned instead of duration. interestingly, fixnum total number of seconds in duration, parsing seems work, convert fixnum after that.

my code far:

class duration   def to_yaml_type     "!example.com,2012-06-28/duration"   end    def to_yaml(opts = {})     yaml.quick_emit( nil, opts ) { |out|       out.scalar( to_yaml_type, to_string_representation, :plain )     }   end    def to_string_representation     format("%h:%m:%s")   end    def duration.from_string_representation(string_representation)     split = string_representation.split(":")     duration.new(:hours => split[0], :minutes => split[1], :seconds => split[2])   end end  yaml::add_domain_type("example.com,2012-06-28", "duration") |type, val|   duration.from_string_representation(val) end

to clarify, results get:

irb> duration.new(27500).to_yaml => "--- !example.com,2012-06-28/duration 7:38:20\n...\n" irb> yaml.load(duration.new(27500).to_yaml) => 27500 # should <duration:0xxxxxxx @seconds=20, @total=27500, @weeks=0, @days=0, @hours=7, @minutes=38>

it you’re using older syck interface, rather newer psych. rather using to_yaml , yaml.quick_emit, can use encode_with, , instead of add_domain_type use add_tag , init_with. (the documentation pretty poor, best can offer link source).

class duration   def to_yaml_type     "tag:example.com,2012-06-28/duration"   end    def encode_with coder     coder.represent_scalar to_yaml_type, to_string_representation   end    def init_with coder     split = coder.scalar.split ":"     initialize(:hours => split[0], :minutes => split[1], :seconds => split[2])   end    def to_string_representation     format("%h:%m:%s")   end    def duration.from_string_representation(string_representation)     split = string_representation.split(":")     duration.new(:hours => split[0], :minutes => split[1], :seconds => split[2])   end end  yaml.add_tag "tag:example.com,2012-06-28/duration", duration  p s = yaml.dump(duration.new(27500)) p yaml.load s

the output is:

"--- !<tag:example.com,2012-06-28/duration> 7:38:20\n...\n" #<duration:0x00000100e0e0d8 @seconds=20, @total=27500, @weeks=0, @days=0, @hours=7, @minutes=38>

(the reason result you’re seeing total number of seconds in duration because being parsed sexagesimal integer.)


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