embedded_hash.rb

require 'pp'

def embedded_hash(levels, key, data)
  if levels == 0
    {key => data}
  else
    {key => embedded_hash(levels-1, key, data)}.merge(data)
  end
end

def dry_hash(hash, drop_keys)
  hash.map { |k,v|
    { k => (v.kind_of?(Hash) ? dry_hash(v, drop_keys) : v) } unless k =~ drop_keys
  }.compact.reduce(&:merge)
end

h = embedded_hash(10-1, :key, {comment: 'this is comment', data: :values})

pp h

pp dry_hash(h, /^comment/)