1.sql

CREATE OR REPLACE FUNCTION fessup.fetch_posts_for_my_timeline(
  fesser_id bigint,
  last_id bigint DEFAULT 0,
  newer boolean DEFAULT true
)
RETURNS SETOF fessup.all_posts
AS $$
BEGIN
    RETURN QUERY
      WITH
        feeds_i_have_blocked AS (
          SELECT * FROM fessup.feed_block WHERE blocker = fesser_id
        ),

        myself_and_other_fessers_whose_posts_i_want_to_see AS (
          SELECT fesser_id UNION ALL
          SELECT followee FROM fessup.following
           WHERE follower = fesser_id
             AND during @> now()
             AND NOT EXISTS ( SELECT * FROM feeds_i_have_blocked WHERE blockee = followee )
        )

      SELECT *
        FROM fessup.all_posts a
       WHERE ((newer AND a.id > last_id) OR (NOT newer AND a.id < last_id))
         AND a.author IN ( SELECT * FROM myself_and_other_fessers_whose_posts_i_want_to_see )
       ORDER BY a.id DESC
       LIMIT 40;
END;;
$$ LANGUAGE plpgsql;