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https://github.com/LemmyNet/lemmy.git
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separate triggers
This commit is contained in:
Dull Bananas
parent
b152be7951
commit
95600da4af
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@ -27,7 +27,7 @@ AS $a$
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BEGIN
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EXECUTE replace($b$
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-- When a thing gets a vote, update its aggregates and its creator's aggregates
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CALL r.create_triggers ('thing_like', $$
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CALL r.create_triggers ('thing_like', 'thing_aggregates_and_person_aggregates', $$
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BEGIN
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WITH thing_diff AS ( UPDATE
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thing_aggregates AS a
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@ -62,7 +62,7 @@ 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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CALL r.create_triggers ('comment', $$
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CALL r.create_triggers ('comment', 'person_aggregates', $$
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BEGIN
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UPDATE
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person_aggregates AS a
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@ -78,66 +78,74 @@ BEGIN
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WHERE
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a.person_id = diff.creator_id;
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UPDATE
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site_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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coalesce(sum(count_diff), 0) AS comments
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FROM
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select_old_and_new_rows AS old_and_new_rows
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WHERE
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r.is_counted (comment)
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AND (comment).local) AS diff;
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RETURN NULL;
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WITH post_diff AS (
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END;
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$$);
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CALL r.create_triggers ('comment', 'site_aggregates', $$
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BEGIN
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UPDATE
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post_aggregates AS a
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site_aggregates AS a
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SET
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comments = a.comments + diff.comments,
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newest_comment_time = GREATEST (a.newest_comment_time, (
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SELECT
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published
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FROM select_new_rows AS new_comment
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WHERE
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a.post_id = new_comment.post_id ORDER BY published DESC LIMIT 1)),
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newest_comment_time_necro = GREATEST (a.newest_comment_time_necro, (
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SELECT
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published
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FROM select_new_rows AS new_comment
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WHERE
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a.post_id = new_comment.post_id
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-- Ignore comments from the post's creator
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AND a.creator_id != new_comment.creator_id
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-- Ignore comments on old posts
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AND a.published > (new_comment.published - '2 days'::interval)
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ORDER BY published DESC LIMIT 1))
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comments = a.comments + diff.comments
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FROM (
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SELECT
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(comment).post_id,
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coalesce(sum(count_diff), 0) AS comments
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FROM
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select_old_and_new_rows AS old_and_new_rows
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WHERE
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r.is_counted (comment)
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GROUP BY
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(comment).post_id) AS diff
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LEFT JOIN post ON post.id = diff.post_id
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WHERE
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a.post_id = diff.post_id
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RETURNING
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a.community_id,
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diff.comments,
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r.is_counted (post.*) AS include_in_community_aggregates)
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FROM select_old_and_new_rows AS old_and_new_rows
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WHERE
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r.is_counted (comment)
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AND (comment).local) AS diff;
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RETURN NULL;
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END;
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$$);
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CALL r.create_triggers ('comment', 'post_aggregates_and_community_aggregates', $$
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BEGIN
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WITH post_diff AS (
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UPDATE
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post_aggregates AS a
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SET
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comments = a.comments + diff.comments,
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newest_comment_time = GREATEST (a.newest_comment_time, (
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SELECT
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published
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FROM select_new_rows AS new_comment
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WHERE
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a.post_id = new_comment.post_id ORDER BY published DESC LIMIT 1)), newest_comment_time_necro = GREATEST (a.newest_comment_time_necro, (
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SELECT
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published
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FROM select_new_rows AS new_comment
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WHERE
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a.post_id = new_comment.post_id
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-- Ignore comments from the post's creator
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AND a.creator_id != new_comment.creator_id
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-- Ignore comments on old posts
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AND a.published > (new_comment.published - '2 days'::interval)
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ORDER BY published DESC LIMIT 1))
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FROM (
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SELECT
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(comment).post_id, coalesce(sum(count_diff), 0) AS comments
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FROM select_old_and_new_rows AS old_and_new_rows
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WHERE
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r.is_counted (comment)
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GROUP BY (comment).post_id) AS diff
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LEFT JOIN post ON post.id = diff.post_id
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WHERE
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a.post_id = diff.post_id
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RETURNING
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a.community_id, diff.comments, r.is_counted (post.*) AS include_in_community_aggregates)
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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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community_id,
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sum(comments) AS comments
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community_id, sum(comments) AS comments
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FROM
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post_diff
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WHERE
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@ -153,7 +161,7 @@ END;
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$$);
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CALL r.create_triggers ('post', $$
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CALL r.create_triggers ('post', 'person_aggregates', $$
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BEGIN
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UPDATE
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person_aggregates AS a
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@ -169,33 +177,45 @@ BEGIN
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WHERE
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a.person_id = diff.creator_id;
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UPDATE
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site_aggregates AS a
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SET
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posts = a.posts + diff.posts
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FROM (
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SELECT
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coalesce(sum(count_diff), 0) AS posts
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FROM
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select_old_and_new_rows AS old_and_new_rows
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WHERE
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r.is_counted (post)
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AND (post).local) AS diff;
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RETURN NULL;
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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 + diff.posts
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FROM (
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SELECT
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(post).community_id,
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coalesce(sum(count_diff), 0) AS posts
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FROM
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select_old_and_new_rows AS old_and_new_rows
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WHERE
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r.is_counted (post)
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GROUP BY
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(post).community_id) AS diff
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END;
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$$);
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CALL r.create_triggers ('post', 'site_aggregates', $$
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BEGIN
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UPDATE
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site_aggregates AS a
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SET
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posts = a.posts + diff.posts
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FROM (
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SELECT
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coalesce(sum(count_diff), 0) AS posts
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FROM select_old_and_new_rows AS old_and_new_rows
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WHERE
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r.is_counted (post)
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AND (post).local) AS diff;
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RETURN NULL;
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END;
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$$);
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CALL r.create_triggers ('post', 'community_aggregates', $$
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BEGIN
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UPDATE
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community_aggregates AS a
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SET
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posts = a.posts + diff.posts
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FROM (
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SELECT
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(post).community_id, coalesce(sum(count_diff), 0) AS posts
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FROM select_old_and_new_rows AS old_and_new_rows
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WHERE
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r.is_counted (post)
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GROUP BY (post).community_id) AS diff
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WHERE
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a.community_id = diff.community_id;
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@ -205,7 +225,7 @@ END;
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$$);
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CALL r.create_triggers ('community', $$
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CALL r.create_triggers ('community', 'site_aggregates', $$
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BEGIN
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UPDATE
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site_aggregates AS a
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@ -225,7 +245,7 @@ END;
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$$);
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CALL r.create_triggers ('person', $$
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CALL r.create_triggers ('person', 'site_aggregates', $$
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BEGIN
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UPDATE
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site_aggregates AS a
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@ -283,7 +303,7 @@ CREATE TRIGGER comment_count
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-- Count subscribers for communities.
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-- subscribers should be updated only when a local community is followed by a local or remote person.
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-- subscribers_local should be updated only when a local person follows a local or remote community.
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CALL r.create_triggers ('community_follower', $$
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CALL r.create_triggers ('community_follower', 'community_aggregates', $$
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BEGIN
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UPDATE
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community_aggregates AS a
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@ -64,46 +64,46 @@ $$;
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-- not allowed for a `DELETE` trigger)
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-- * Transition tables are only provided to the trigger function, not to functions that it calls.
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--
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-- This function can only be called once per table. The trigger function body given as the 2nd argument
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-- and can contain these names, which are replaced with a `SELECT` statement in parenthesis if needed:
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-- The trigger function body is given as the 2nd argument and can contain these names, which are
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-- replaced with a `SELECT` statement in parenthesis if needed:
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-- * `select_old_rows`
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-- * `select_new_rows`
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-- * `select_old_and_new_rows` with 2 columns:
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-- 1. `count_diff`: `-1` for old rows and `1` for new rows, which can be used with `sum` to get the number
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-- to add to a count
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-- 2. (same name as the trigger's table): the old or new row as a composite value
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CREATE PROCEDURE r.create_triggers (table_name text, function_body text)
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CREATE PROCEDURE r.create_triggers (table_name text, trigger_name text, function_body text)
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LANGUAGE plpgsql
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AS $a$
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DECLARE
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defs text := $$
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-- Delete
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CREATE FUNCTION r.thing_delete_statement ()
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CREATE FUNCTION r.thing_trigger_name_for_delete_statement ()
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RETURNS TRIGGER
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LANGUAGE plpgsql
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AS function_body_delete;
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CREATE TRIGGER delete_statement
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CREATE TRIGGER trigger_name_for_delete_statement
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AFTER DELETE ON thing REFERENCING OLD TABLE AS select_old_rows
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FOR EACH STATEMENT
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EXECUTE FUNCTION r.thing_delete_statement ( );
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EXECUTE FUNCTION r.thing_trigger_name_for_delete_statement ( );
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-- Insert
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CREATE FUNCTION r.thing_insert_statement ( )
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CREATE FUNCTION r.thing_trigger_name_for_insert_statement ( )
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RETURNS TRIGGER
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LANGUAGE plpgsql
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AS function_body_insert;
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CREATE TRIGGER insert_statement
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CREATE TRIGGER trigger_name_for_insert_statement
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AFTER INSERT ON thing REFERENCING NEW TABLE AS select_new_rows
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FOR EACH STATEMENT
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EXECUTE FUNCTION r.thing_insert_statement ( );
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EXECUTE FUNCTION r.thing_trigger_name_for_insert_statement ( );
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-- Update
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CREATE FUNCTION r.thing_update_statement ( )
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CREATE FUNCTION r.thing_trigger_name_for_update_statement ( )
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RETURNS TRIGGER
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LANGUAGE plpgsql
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AS function_body_update;
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CREATE TRIGGER update_statement
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CREATE TRIGGER trigger_name_for_update_statement
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AFTER UPDATE ON thing REFERENCING OLD TABLE AS select_old_rows NEW TABLE AS select_new_rows
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FOR EACH STATEMENT
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EXECUTE FUNCTION r.thing_update_statement ( );
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EXECUTE FUNCTION r.thing_trigger_name_for_update_statement ( );
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$$;
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select_old_and_new_rows text := $$ (
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SELECT
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@ -135,6 +135,7 @@ DECLARE
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FALSE) $$;
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BEGIN
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function_body := replace(function_body, 'select_old_and_new_rows', select_old_and_new_rows);
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defs := replace(defs, 'trigger_name', trigger_name);
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-- `select_old_rows` and `select_new_rows` are made available as empty tables if they don't already exist
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defs := replace(defs, 'function_body_delete', quote_literal(replace(function_body, 'select_new_rows', empty_select_new_rows)));
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defs := replace(defs, 'function_body_insert', quote_literal(replace(function_body, 'select_old_rows', empty_select_old_rows)));
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4
migrations/2024-05-04-140749_separate_triggers/up.sql
Normal file
4
migrations/2024-05-04-140749_separate_triggers/up.sql
Normal file
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@ -0,0 +1,4 @@
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-- This migration exists to trigger re-execution of replaceable_schema
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SELECT
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1;
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