module Hashie::Extensions::DeepMerge

def _recursive_merge(hash, other_hash, &block)
  other_hash.each do |k, v|
    hash[k] = if hash.key?(k) && hash[k].is_a?(::Hash) && v.is_a?(::Hash)
                _recursive_merge(hash[k], v, &block)
              else
                if hash.key?(k) && block_given?
                  block.call(k, hash[k], v)
                else
                  v
                end
              end
  end
  hash
end