How to work with hash in ruby? -


my hash example: 

{"79_6"=>"0", "85_6"=>"1", "86_6"=>"1", "79_8638"=>"0", "80_8638"=>"0", "81_8638"=>"0", "82_8638"=>"1", "83_8638"=>"1", "84_8638"=>"0", "85_8638"=>"1", "86_8638"=>"0", "79_8639"=>"0", "80_8639"=>"0", "81_8639"=>"0", "82_8639"=>"0", "83_8639"=>"0", "84_8639"=>"0", "85_8639"=>"0", "86_8639"=>"0", "80_8640"=>"0", "81_8640"=>"1", "82_8640"=>"1", "83_8640"=>"1", "84_8640"=>"0", "85_8640"=>"0", "86_8640"=>"0"}

i need parameters key 1:

["85_6", "86_6", "82_8638", "83_8638", "85_8638", "81_8640", "82_8640", "83_8640"]

next, need group:

{"6"=>"85, 86", "8638"=> "83, 82, 85", "8640" => "81, 82, 83"} 

hash.select { |_, v| v == '1' }     .keys     .map { |e| e.split('_') }     .group_by(&:pop)     .map { |k, v| [k, v.join(', ')] }     .to_h #⇒ { #     "6" => "85, 86", #  "8638" => "82, 83, 85", #  "8640" => "81, 82, 83" # }

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