# File lib/rabl/builder.rb, line 77
      def deep_replace_nil_values(hash)
        hash.inject({}) do |new_hash, (k, v)|
          new_hash[k] = if v.is_a?(Hash)
            deep_replace_nil_values(v)
          else
            v.nil? ? '' : v
          end
          new_hash
        end
      end