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update comment count in post trigger
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@ -202,7 +202,8 @@ CALL r.post_or_comment ('post');
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CALL r.post_or_comment ('comment');
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-- Create triggers that update counts in parent aggregates
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-- Create triggers that update counts in parent aggregates (a trigger can run in response to deletion caused by
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-- a foreign key with `ON DELETE CASCADE`, so the parent might not exist)
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CALL r.create_triggers ('comment', $$ WITH comment_group AS (
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SELECT
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(comment).post_id,
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@ -287,7 +288,8 @@ unused_person_aggregates_update_result AS (
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CALL r.create_triggers ('post', $$ WITH post_group AS (
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SELECT
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(post).community_id, (post).creator_id, (post).local, coalesce(sum(count_diff), 0) AS posts FROM combined_transition_tables
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(post).community_id, (post).creator_id, (post).local, coalesce(sum(count_diff), 0) AS posts,
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coalesce(sum(count_diff * (SELECT comments FROM post_aggregates WHERE post_id = (post).id LIMIT 1)), 0) AS comments FROM combined_transition_tables
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WHERE
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NOT ((post).deleted
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OR (post).removed)
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@ -307,7 +309,9 @@ CALL r.create_triggers ('post', $$ WITH post_group AS (
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UPDATE
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community_aggregates AS a
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SET
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posts = a.posts + post_group.posts FROM post_group
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posts = a.posts + post_group.posts,
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-- Update comment count when post is deleted, removed, or restored
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comments = a.comments + post_group.comments FROM post_group
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WHERE
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a.community_id = post_group.community_id $$);
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@ -329,53 +333,6 @@ CALL r.create_triggers ('person', $$ UPDATE
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coalesce(sum(count_diff), 0) AS users FROM combined_transition_tables
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WHERE (person).local) AS diff $$);
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-- For community_aggregates.comments, don't include comments of deleted or removed posts
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CREATE FUNCTION r.update_comment_count_from_post ()
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RETURNS TRIGGER
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LANGUAGE plpgsql
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AS $$
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BEGIN
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UPDATE
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community_aggregates AS a
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SET
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comments = a.comments + diff.comments
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FROM (
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SELECT
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old_post.community_id,
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sum((
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CASE WHEN new_post.deleted
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AND new_post.removed THEN
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-1
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ELSE
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1
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END) * post_aggregates.comments) AS comments
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FROM
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new_post
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INNER JOIN old_post ON new_post.id = old_post.id
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AND (new_post.deleted
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AND new_post.removed) != (old_post.deleted
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AND old_post.removed),
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LATERAL (
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SELECT
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*
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FROM
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post_aggregates
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WHERE
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post_id = new_post.id
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LIMIT 1) AS post_aggregates
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GROUP BY
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old_post.community_id) AS diff
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WHERE
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a.community_id = diff.community_id;
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RETURN NULL;
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END
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$$;
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CREATE TRIGGER comment_count
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AFTER UPDATE ON post REFERENCING OLD TABLE AS old_post NEW TABLE AS new_post
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FOR EACH STATEMENT
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EXECUTE FUNCTION r.update_comment_count_from_post ();
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-- Count subscribers for local communities
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CALL r.create_triggers ('community_follower', $$ UPDATE
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community_aggregates AS a
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