merge same key array of hashes

ze.rb

# input = [
#   {:alarma=>{:foo2=>"bar2"}},
#   {:alarma=>{:foo=>"bar"}},
#   {:alarma=>{:test2=>{:foo=>"bar"}}},
#   {:cenas=>"teste"},
#   {:alarma=>{:foo2=>"bar2", :foo=>"bar"}}
# ]

input = [
  {:foo=>{:foo=>{:bar=>"stuff"}}},
  {:foo=>{:foo=>{:foo=>"bar"}}}
]

# based on: http://stackoverflow.com/questions/136793/is-there-a-do-while-loop-in-ruby
# array.group_by(&:keys).map{|k, v| {k.first => v.flat_map(&:values)}}

def squeeze_hash_array(ary)
  ary
    .group_by(&:keys)
    .map do |k, v|
      flat_values = v.flat_map(&:values)

      {}.tap do |h|
        h[k.first] = if flat_values.all?{|fv| fv.is_a?(Hash)}
          squeeze_hash_array(flat_values)
        else
          flat_values[0]
        end
      end
    end
    .reduce(&:merge)
end

result = squeeze_hash_array(input)

puts result