    # File lib/active_record/connection_adapters/postgresql_adapter.rb, line 323
          def unescape_bytea(original_value)
            # In each case, check if the value actually is escaped PostgreSQL bytea output
            # or an unescaped Active Record attribute that was just written.
            if @connection.respond_to?(:unescape_bytea)
              self.class.instance_eval do
                define_method(:unescape_bytea) do |value|
                  @connection.unescape_bytea(value) if value
                end
              end
            elsif PGconn.respond_to?(:unescape_bytea)
              self.class.instance_eval do
                define_method(:unescape_bytea) do |value|
                  PGconn.unescape_bytea(value) if value
                end
              end
            else
              raise 'Your PostgreSQL connection does not support unescape_bytea. Try upgrading to pg 0.9.0 or later.'
            end
            unescape_bytea(original_value)
          end