custom Hash.to_yaml fails with a Hash inside an Array value
-----------------------------------------------------------
Key: JRUBY-3422
URL: http://jira.codehaus.org/browse/JRUBY-3422
Project: JRuby
Issue Type: Bug
Affects Versions: JRuby 1.1.6
Environment: jruby 1.1.6 (ruby 1.8.6 patchlevel 114) (2008-12-17 rev
8388) [i386-java]
Reporter: Karol Bucek
Assignee: Thomas E Enebo
this seems as an YAML::Emiter MRI incompatibility
let's suppose that we have redefined Hash.to_yaml :
{code}
require 'yaml'
Hash.class_eval do
def to_yaml( opts = {} )
YAML::quick_emit( self, opts ) do |out|
out.map( taguri, to_yaml_style ) do |map|
each do |k, v|
map.add( k, v )
end
end
end
end
end
{code}
now the following Hash structure will fail to convert to YAML :
{code}
hash = { "element" => "value", "array" => [ { "nested_element" =>
"nested_value" } ] }
puts hash.to_yaml # works only with C-Ruby
{code}
with a TypeError :
{code}
yaml:210:in `to_yaml_node': wrong argument type String (expected
YAML::JvYAML::Node) (TypeError)
from yaml:142:in `to_s'
from yaml:114:in `map'
from main.rb:22:in `to_yaml'
from yaml:64:in `call'
from yaml:64:in `emit'
from yaml:100:in `quick_emit'
from main.rb:21:in `to_yaml'
from main.rb:38
{code}
the problem seems to be related to the array value with a hash element
the provided Hash.to_yaml code is for demonstration only and is actualy the
same as the one available in C-Ruby, overriding the to_yaml method makes sense
e.g. when someone wants the keys to be sorted in the yaml output.
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