mirror of
https://github.com/LemmyNet/lemmy.git
synced 2024-12-26 01:40:33 +00:00
separate triggers
This commit is contained in:
Dull Bananas
parent
b152be7951
commit
95600da4af
3 changed files with 117 additions and 92 deletions
|
|
@ -27,7 +27,7 @@ AS $a$
|
|||
BEGIN
|
||||
EXECUTE replace($b$
|
||||
-- When a thing gets a vote, update its aggregates and its creator's aggregates
|
||||
CALL r.create_triggers ('thing_like', $$
|
||||
CALL r.create_triggers ('thing_like', 'thing_aggregates_and_person_aggregates', $$
|
||||
BEGIN
|
||||
WITH thing_diff AS ( UPDATE
|
||||
thing_aggregates AS a
|
||||
|
|
@ -62,7 +62,7 @@ CALL r.post_or_comment ('post');
|
|||
CALL r.post_or_comment ('comment');
|
||||
|
||||
-- Create triggers that update counts in parent aggregates
|
||||
CALL r.create_triggers ('comment', $$
|
||||
CALL r.create_triggers ('comment', 'person_aggregates', $$
|
||||
BEGIN
|
||||
UPDATE
|
||||
person_aggregates AS a
|
||||
|
|
@ -78,66 +78,74 @@ BEGIN
|
|||
WHERE
|
||||
a.person_id = diff.creator_id;
|
||||
|
||||
UPDATE
|
||||
site_aggregates AS a
|
||||
SET
|
||||
comments = a.comments + diff.comments
|
||||
FROM (
|
||||
SELECT
|
||||
coalesce(sum(count_diff), 0) AS comments
|
||||
FROM
|
||||
select_old_and_new_rows AS old_and_new_rows
|
||||
WHERE
|
||||
r.is_counted (comment)
|
||||
AND (comment).local) AS diff;
|
||||
RETURN NULL;
|
||||
|
||||
WITH post_diff AS (
|
||||
END;
|
||||
|
||||
$$);
|
||||
|
||||
CALL r.create_triggers ('comment', 'site_aggregates', $$
|
||||
BEGIN
|
||||
UPDATE
|
||||
post_aggregates AS a
|
||||
site_aggregates AS a
|
||||
SET
|
||||
comments = a.comments + diff.comments,
|
||||
newest_comment_time = GREATEST (a.newest_comment_time, (
|
||||
SELECT
|
||||
published
|
||||
FROM select_new_rows AS new_comment
|
||||
WHERE
|
||||
a.post_id = new_comment.post_id ORDER BY published DESC LIMIT 1)),
|
||||
newest_comment_time_necro = GREATEST (a.newest_comment_time_necro, (
|
||||
SELECT
|
||||
published
|
||||
FROM select_new_rows AS new_comment
|
||||
WHERE
|
||||
a.post_id = new_comment.post_id
|
||||
-- Ignore comments from the post's creator
|
||||
AND a.creator_id != new_comment.creator_id
|
||||
-- Ignore comments on old posts
|
||||
AND a.published > (new_comment.published - '2 days'::interval)
|
||||
ORDER BY published DESC LIMIT 1))
|
||||
comments = a.comments + diff.comments
|
||||
FROM (
|
||||
SELECT
|
||||
(comment).post_id,
|
||||
coalesce(sum(count_diff), 0) AS comments
|
||||
FROM
|
||||
select_old_and_new_rows AS old_and_new_rows
|
||||
WHERE
|
||||
r.is_counted (comment)
|
||||
GROUP BY
|
||||
(comment).post_id) AS diff
|
||||
LEFT JOIN post ON post.id = diff.post_id
|
||||
WHERE
|
||||
a.post_id = diff.post_id
|
||||
RETURNING
|
||||
a.community_id,
|
||||
diff.comments,
|
||||
r.is_counted (post.*) AS include_in_community_aggregates)
|
||||
FROM select_old_and_new_rows AS old_and_new_rows
|
||||
WHERE
|
||||
r.is_counted (comment)
|
||||
AND (comment).local) AS diff;
|
||||
|
||||
RETURN NULL;
|
||||
|
||||
END;
|
||||
|
||||
$$);
|
||||
|
||||
CALL r.create_triggers ('comment', 'post_aggregates_and_community_aggregates', $$
|
||||
BEGIN
|
||||
WITH post_diff AS (
|
||||
UPDATE
|
||||
post_aggregates AS a
|
||||
SET
|
||||
comments = a.comments + diff.comments,
|
||||
newest_comment_time = GREATEST (a.newest_comment_time, (
|
||||
SELECT
|
||||
published
|
||||
FROM select_new_rows AS new_comment
|
||||
WHERE
|
||||
a.post_id = new_comment.post_id ORDER BY published DESC LIMIT 1)), newest_comment_time_necro = GREATEST (a.newest_comment_time_necro, (
|
||||
SELECT
|
||||
published
|
||||
FROM select_new_rows AS new_comment
|
||||
WHERE
|
||||
a.post_id = new_comment.post_id
|
||||
-- Ignore comments from the post's creator
|
||||
AND a.creator_id != new_comment.creator_id
|
||||
-- Ignore comments on old posts
|
||||
AND a.published > (new_comment.published - '2 days'::interval)
|
||||
ORDER BY published DESC LIMIT 1))
|
||||
FROM (
|
||||
SELECT
|
||||
(comment).post_id, coalesce(sum(count_diff), 0) AS comments
|
||||
FROM select_old_and_new_rows AS old_and_new_rows
|
||||
WHERE
|
||||
r.is_counted (comment)
|
||||
GROUP BY (comment).post_id) AS diff
|
||||
LEFT JOIN post ON post.id = diff.post_id
|
||||
WHERE
|
||||
a.post_id = diff.post_id
|
||||
RETURNING
|
||||
a.community_id, diff.comments, r.is_counted (post.*) AS include_in_community_aggregates)
|
||||
UPDATE
|
||||
community_aggregates AS a
|
||||
SET
|
||||
comments = a.comments + diff.comments
|
||||
FROM (
|
||||
SELECT
|
||||
community_id,
|
||||
sum(comments) AS comments
|
||||
community_id, sum(comments) AS comments
|
||||
FROM
|
||||
post_diff
|
||||
WHERE
|
||||
|
|
@ -153,7 +161,7 @@ END;
|
|||
|
||||
$$);
|
||||
|
||||
CALL r.create_triggers ('post', $$
|
||||
CALL r.create_triggers ('post', 'person_aggregates', $$
|
||||
BEGIN
|
||||
UPDATE
|
||||
person_aggregates AS a
|
||||
|
|
@ -169,33 +177,45 @@ BEGIN
|
|||
WHERE
|
||||
a.person_id = diff.creator_id;
|
||||
|
||||
UPDATE
|
||||
site_aggregates AS a
|
||||
SET
|
||||
posts = a.posts + diff.posts
|
||||
FROM (
|
||||
SELECT
|
||||
coalesce(sum(count_diff), 0) AS posts
|
||||
FROM
|
||||
select_old_and_new_rows AS old_and_new_rows
|
||||
WHERE
|
||||
r.is_counted (post)
|
||||
AND (post).local) AS diff;
|
||||
RETURN NULL;
|
||||
|
||||
UPDATE
|
||||
community_aggregates AS a
|
||||
SET
|
||||
posts = a.posts + diff.posts
|
||||
FROM (
|
||||
SELECT
|
||||
(post).community_id,
|
||||
coalesce(sum(count_diff), 0) AS posts
|
||||
FROM
|
||||
select_old_and_new_rows AS old_and_new_rows
|
||||
WHERE
|
||||
r.is_counted (post)
|
||||
GROUP BY
|
||||
(post).community_id) AS diff
|
||||
END;
|
||||
|
||||
$$);
|
||||
|
||||
CALL r.create_triggers ('post', 'site_aggregates', $$
|
||||
BEGIN
|
||||
UPDATE
|
||||
site_aggregates AS a
|
||||
SET
|
||||
posts = a.posts + diff.posts
|
||||
FROM (
|
||||
SELECT
|
||||
coalesce(sum(count_diff), 0) AS posts
|
||||
FROM select_old_and_new_rows AS old_and_new_rows
|
||||
WHERE
|
||||
r.is_counted (post)
|
||||
AND (post).local) AS diff;
|
||||
|
||||
RETURN NULL;
|
||||
|
||||
END;
|
||||
|
||||
$$);
|
||||
|
||||
CALL r.create_triggers ('post', 'community_aggregates', $$
|
||||
BEGIN
|
||||
UPDATE
|
||||
community_aggregates AS a
|
||||
SET
|
||||
posts = a.posts + diff.posts
|
||||
FROM (
|
||||
SELECT
|
||||
(post).community_id, coalesce(sum(count_diff), 0) AS posts
|
||||
FROM select_old_and_new_rows AS old_and_new_rows
|
||||
WHERE
|
||||
r.is_counted (post)
|
||||
GROUP BY (post).community_id) AS diff
|
||||
WHERE
|
||||
a.community_id = diff.community_id;
|
||||
|
||||
|
|
@ -205,7 +225,7 @@ END;
|
|||
|
||||
$$);
|
||||
|
||||
CALL r.create_triggers ('community', $$
|
||||
CALL r.create_triggers ('community', 'site_aggregates', $$
|
||||
BEGIN
|
||||
UPDATE
|
||||
site_aggregates AS a
|
||||
|
|
@ -225,7 +245,7 @@ END;
|
|||
|
||||
$$);
|
||||
|
||||
CALL r.create_triggers ('person', $$
|
||||
CALL r.create_triggers ('person', 'site_aggregates', $$
|
||||
BEGIN
|
||||
UPDATE
|
||||
site_aggregates AS a
|
||||
|
|
@ -283,7 +303,7 @@ CREATE TRIGGER comment_count
|
|||
-- Count subscribers for communities.
|
||||
-- subscribers should be updated only when a local community is followed by a local or remote person.
|
||||
-- subscribers_local should be updated only when a local person follows a local or remote community.
|
||||
CALL r.create_triggers ('community_follower', $$
|
||||
CALL r.create_triggers ('community_follower', 'community_aggregates', $$
|
||||
BEGIN
|
||||
UPDATE
|
||||
community_aggregates AS a
|
||||
|
|
|
|||
|
|
@ -64,46 +64,46 @@ $$;
|
|||
-- not allowed for a `DELETE` trigger)
|
||||
-- * Transition tables are only provided to the trigger function, not to functions that it calls.
|
||||
--
|
||||
-- This function can only be called once per table. The trigger function body given as the 2nd argument
|
||||
-- and can contain these names, which are replaced with a `SELECT` statement in parenthesis if needed:
|
||||
-- The trigger function body is given as the 2nd argument and can contain these names, which are
|
||||
-- replaced with a `SELECT` statement in parenthesis if needed:
|
||||
-- * `select_old_rows`
|
||||
-- * `select_new_rows`
|
||||
-- * `select_old_and_new_rows` with 2 columns:
|
||||
-- 1. `count_diff`: `-1` for old rows and `1` for new rows, which can be used with `sum` to get the number
|
||||
-- to add to a count
|
||||
-- 2. (same name as the trigger's table): the old or new row as a composite value
|
||||
CREATE PROCEDURE r.create_triggers (table_name text, function_body text)
|
||||
CREATE PROCEDURE r.create_triggers (table_name text, trigger_name text, function_body text)
|
||||
LANGUAGE plpgsql
|
||||
AS $a$
|
||||
DECLARE
|
||||
defs text := $$
|
||||
-- Delete
|
||||
CREATE FUNCTION r.thing_delete_statement ()
|
||||
CREATE FUNCTION r.thing_trigger_name_for_delete_statement ()
|
||||
RETURNS TRIGGER
|
||||
LANGUAGE plpgsql
|
||||
AS function_body_delete;
|
||||
CREATE TRIGGER delete_statement
|
||||
CREATE TRIGGER trigger_name_for_delete_statement
|
||||
AFTER DELETE ON thing REFERENCING OLD TABLE AS select_old_rows
|
||||
FOR EACH STATEMENT
|
||||
EXECUTE FUNCTION r.thing_delete_statement ( );
|
||||
EXECUTE FUNCTION r.thing_trigger_name_for_delete_statement ( );
|
||||
-- Insert
|
||||
CREATE FUNCTION r.thing_insert_statement ( )
|
||||
CREATE FUNCTION r.thing_trigger_name_for_insert_statement ( )
|
||||
RETURNS TRIGGER
|
||||
LANGUAGE plpgsql
|
||||
AS function_body_insert;
|
||||
CREATE TRIGGER insert_statement
|
||||
CREATE TRIGGER trigger_name_for_insert_statement
|
||||
AFTER INSERT ON thing REFERENCING NEW TABLE AS select_new_rows
|
||||
FOR EACH STATEMENT
|
||||
EXECUTE FUNCTION r.thing_insert_statement ( );
|
||||
EXECUTE FUNCTION r.thing_trigger_name_for_insert_statement ( );
|
||||
-- Update
|
||||
CREATE FUNCTION r.thing_update_statement ( )
|
||||
CREATE FUNCTION r.thing_trigger_name_for_update_statement ( )
|
||||
RETURNS TRIGGER
|
||||
LANGUAGE plpgsql
|
||||
AS function_body_update;
|
||||
CREATE TRIGGER update_statement
|
||||
CREATE TRIGGER trigger_name_for_update_statement
|
||||
AFTER UPDATE ON thing REFERENCING OLD TABLE AS select_old_rows NEW TABLE AS select_new_rows
|
||||
FOR EACH STATEMENT
|
||||
EXECUTE FUNCTION r.thing_update_statement ( );
|
||||
EXECUTE FUNCTION r.thing_trigger_name_for_update_statement ( );
|
||||
$$;
|
||||
select_old_and_new_rows text := $$ (
|
||||
SELECT
|
||||
|
|
@ -135,6 +135,7 @@ DECLARE
|
|||
FALSE) $$;
|
||||
BEGIN
|
||||
function_body := replace(function_body, 'select_old_and_new_rows', select_old_and_new_rows);
|
||||
defs := replace(defs, 'trigger_name', trigger_name);
|
||||
-- `select_old_rows` and `select_new_rows` are made available as empty tables if they don't already exist
|
||||
defs := replace(defs, 'function_body_delete', quote_literal(replace(function_body, 'select_new_rows', empty_select_new_rows)));
|
||||
defs := replace(defs, 'function_body_insert', quote_literal(replace(function_body, 'select_old_rows', empty_select_old_rows)));
|
||||
|
|
|
|||
4
migrations/2024-05-04-140749_separate_triggers/up.sql
Normal file
4
migrations/2024-05-04-140749_separate_triggers/up.sql
Normal file
|
|
@ -0,0 +1,4 @@
|
|||
-- This migration exists to trigger re-execution of replaceable_schema
|
||||
SELECT
|
||||
1;
|
||||
|
||||
Loading…
Reference in a new issue