[Yaml-core] Hash subclasses

[Jeff W. <je...@gl...>]

Is there a way to get Hash subclasses to dump as objects rather than Hashes?

I saw an old message (circa 2002) on this reporting that this should
"just work". But it doesn't seem to:

Subclass of Hash:

require 'yaml'

class Fred < Hash
    def initialize (value)
        @value = value
    end
end

fred = Fred.new("A value")
y fred

--- !ruby/hash:Fred {}

Not a subclass of Hash:

class Fred
    def initialize (value)
        @value = value
    end
end

fred = Fred.new("A value")
y fred

--- !ruby/object:Fred
value: A value

As you can see, the subclass loses the "value" variable. Is there any
way around this?

I thought that yaml would be a drop-in replacement for pstore as the
session storage in rails, so that I could share some session data with a
legacy perl app. This is looking increasingly not the case:(

Jeff