Ruby - extracting the unique values per key from an array of hashes

Question

From a hash like the below one, need to extract the unique values per key

array_of_hashes = [ {\'a\' => 1, \'b\' => 2 , \'c\' => 3} , 
                      


        

Answer 1

This is more generic:

options = {}
distinct_keys = array_of_hashes.map(&:keys).flatten.uniq
distinct_keys.each do |k|
  options[k] = array_of_hashes.map {|o| o[k]}.uniq
end