with_subscriptions_connection

# File actioncable/lib/action_cable/subscription_adapter/postgresql.rb, line 37
      def with_subscriptions_connection(&block) # :nodoc:
        # Action Cable is taking ownership over this database connection, and will
        # perform the necessary cleanup tasks.
        # We purposedly avoid #checkout to not end up with a pinned connection
        ar_conn = ActiveRecord::Base.connection_pool.new_connection
        pg_conn = ar_conn.raw_connection

        verify!(pg_conn)
        pg_conn.exec("SET application_name = #{pg_conn.escape_identifier(identifier)}")
        yield pg_conn
      ensure
        ar_conn&.disconnect!
      end