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Bug #7893
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Issues with loading YAML and respond_to_missing?
Bug #7893: Issues with loading YAML and respond_to_missing?
Description
This is perhaps not a bug, I could be missing something, but shouldn't the following code work?
require 'yaml' class Person def initialize(name) @attributes = { name: name } end def method_missing(m, *args, &block) @attributes.key?(m) ? @attributes[m] : super end def respond_to_missing?(m, include_private = false) @attributes.key?(m) || super end end dump = YAML.dump Person.new("lee") load = YAML.load dump The YAML.dump appears to work as expected, yet when I attempt to load the dump back, I get the following exception:
/Users/lee/bin/rb:15:in `respond_to_missing?': undefined method `key?' for nil:NilClass (NoMethodError) from /Users/lee/.rubies/1.9.3-p385/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:291:in `respond_to?' from /Users/lee/.rubies/1.9.3-p385/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:291:in `init_with' from /Users/lee/.rubies/1.9.3-p385/lib/ruby/1.9.1/psych/visitors/to_ruby.rb:284:in `revive' However doing the same thing with JSON for example, works fine: https://gist.github.com/injekt/0a4aa3e25f09ae2f8cba
Updated by Hanmac (Hans Mackowiak) over 12 years ago
the problem is in yaml: to_ruby.rb "if o.respond_to?(:init_with)" so eigher you need to define a init_with method or
def respond_to_missing?(m, include_private = false)
(@attributes && @attributes.key?(m)) || super
end
Updated by drbrain (Eric Hodel) over 12 years ago
- Category changed from core to ext
- Status changed from Open to Rejected
- Assignee set to tenderlovemaking (Aaron Patterson)
As Hanmac noted, this exception is possible with Person.allocate.respond_to? which is exactly what Psych does.
Perhaps Psych needs some documentation improvement around dump and load.
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