ruby - Excluding one list of items from another -

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i have yml file looks this:

level 1:   seattle:     name: "rick"     id: "95155"     time: "2:00 pm"     car: "hyundai"   denver:     name: "arnold"     id: "82594"     time: "2:00 pm"     car: "mitsubishi" level 2:    san antonio:     name: "james"     id: "96231"     time: "2:00 pm"     car: "honda"   minneapolis:     name: "ron"     id: "73122"     time: "2:00 pm"     car: "dodge

i need read id values array processing, remove them array. ways go this?

you can read id values array processing in below way :

require 'yaml'  yml = <<-_end_  ---  level1:  seattle:   name: "rick"   id: "95155"   time: "2:00 pm"   car: "hyundai"  denver:   name: "arnold"   id: "82594"   time: "2:00 pm"   car: "mitsubishi" level 2:  san antonio:   name: "james"   id: "96231"   time: "2:00 pm"   car: "honda"  minneapolis:   name: "ron"   id: "73122"   time: "2:00 pm"   car: "dodge"  _end_  hsh = yaml.load(yml) # => {"level1"=> #      {"seattle"=> #        {"name"=>"rick", "id"=>"95155", "time"=>"2:00 pm", "car"=>"hyundai"}, #       "denver"=> #        {"name"=>"arnold", #         "id"=>"82594", #         "time"=>"2:00 pm", #         "car"=>"mitsubishi"}}, #     "level 2"=> #      {"san antonio"=> #        {"name"=>"james", "id"=>"96231", "time"=>"2:00 pm", "car"=>"honda"}, #       "minneapolis"=> #        {"name"=>"ron", "id"=>"73122", "time"=>"2:00 pm", "car"=>"dodge"}}}  def hash_value(hsh)   keys = hsh.keys   keys.each_with_object([]){|e,ar| hsh[e].is_a?(hash) ? ar << hash_value(hsh[e]).flatten.uniq : ar << hsh["id"]}.flatten end  hash_value(hsh) # => ["95155", "82594", "96231", "73122"]

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