From: "John-Mason P. Shackelford" <jpshack@...>
Date: 2005-10-18T00:49:54+09:00
Subject: YAML serialization of exceptions

Why does the YAML library add a 'mesg' instance variable instead of
re-implementing Exception#message to return @message? Any reason why
we don't preserve the backtrace as well? (Relevant YAML code excepted
below.)

# File yaml/rubytypes.rb
YAML.add_ruby_type( /^exception/ ) { |type, val|
    type, obj_class = YAML.read_type_class( type, Exception )
    o = YAML.object_maker( obj_class, { 'mesg' => val.delete( 'message' ) } )
    val.each_pair { |k,v|
		o.instance_variable_set("@#{k}", v)
	}
	o
}

# File yaml/rubytypes.rb, line 119
    def Exception.yaml_new( klass, tag, val )
        o = YAML.object_maker( klass, { 'mesg' => val.delete( 'message' ) } )
        val.each_pair do |k,v|
            o.instance_variable_set("@#{k}", v)
        end
        o
    end


Is the best way for me to support this functionality for a particular
exception to call YAML.add_ruby_type() and to implement #to_yaml and
#yaml_new methods on my exception?

Thanks!


John-Mason Shackelford

Software Developer
Pearson Educational Measurement

2510 North Dodge St.
Iowa City, IA 52245
ph. 319-354-9200x6214
john-mason.shackelford@pearson.com
http://pearsonedmeasurement.com