Print Exception Class Hieararchy

Platform: Ruby / Rails

Published Sep 19, 2005

Updated Sep 19, 2005

1,055 3

Prints an indented exception class hiearchy.

require 'pp'

tree = (cr = lambda {|h,k| h[k] = Hash.new &cr})[{},nil]

ObjectSpace.each_object(Class) {|cl| if cl.ancestors.include? Exception

then cl.ancestors.reverse.inject(tree){|tr,cl| tr[cl]} end}

pp tree

Comments

log2 - Nov 10, 2005

I think he means what EXACTLY does it do.. not everyone knows what a class hierarchy is

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dr_bob - Oct 06, 2005

I\'ve described what it is for. Do you mean an explanation how it works?

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Hawkee - Sep 19, 2005

Thanks for the snippet dr bob, but maybe you can add some layman terms to your description so newbies might know what this is for.

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