mirror of
https://github.com/LemmyNet/lemmy.git
synced 2024-12-27 19:09:09 +00:00
119 lines
4.2 KiB
SQL
119 lines
4.2 KiB
SQL
-- Remove the comment.read column, and create a new comment_reply table,
|
|
-- similar to the person_mention table.
|
|
--
|
|
-- This is necessary because self-joins using ltrees would be too tough with SQL views
|
|
--
|
|
-- Every comment should have a row here, because all comments have a recipient,
|
|
-- either the post creator, or the parent commenter.
|
|
create table comment_reply(
|
|
id serial primary key,
|
|
recipient_id int references person on update cascade on delete cascade not null,
|
|
comment_id int references comment on update cascade on delete cascade not null,
|
|
read boolean default false not null,
|
|
published timestamp not null default now(),
|
|
unique(recipient_id, comment_id)
|
|
);
|
|
|
|
-- Ones where parent_id is null, use the post creator recipient
|
|
insert into comment_reply (recipient_id, comment_id, read)
|
|
select p.creator_id, c.id, c.read from comment c
|
|
inner join post p on c.post_id = p.id
|
|
where c.parent_id is null;
|
|
|
|
-- Ones where there is a parent_id, self join to comment to get the parent comment creator
|
|
insert into comment_reply (recipient_id, comment_id, read)
|
|
select c2.creator_id, c.id, c.read from comment c
|
|
inner join comment c2 on c.parent_id = c2.id;
|
|
|
|
-- Drop comment_alias view
|
|
drop view comment_alias_1;
|
|
|
|
alter table comment drop column read;
|
|
|
|
create extension if not exists ltree;
|
|
|
|
alter table comment add column path ltree not null default '0';
|
|
alter table comment_aggregates add column child_count integer not null default 0;
|
|
|
|
-- The ltree path column should be the comment_id parent paths, separated by dots.
|
|
-- Stackoverflow: building an ltree from a parent_id hierarchical tree:
|
|
-- https://stackoverflow.com/a/1144848/1655478
|
|
|
|
create temporary table comment_temp as
|
|
WITH RECURSIVE q AS (
|
|
SELECT h, 1 AS level, ARRAY[id] AS breadcrumb
|
|
FROM comment h
|
|
WHERE parent_id is null
|
|
UNION ALL
|
|
SELECT hi, q.level + 1 AS level, breadcrumb || id
|
|
FROM q
|
|
JOIN comment hi
|
|
ON hi.parent_id = (q.h).id
|
|
)
|
|
SELECT (q.h).id,
|
|
(q.h).parent_id,
|
|
level,
|
|
breadcrumb::VARCHAR AS path,
|
|
text2ltree('0.' || array_to_string(breadcrumb, '.')) as ltree_path
|
|
FROM q
|
|
ORDER BY
|
|
breadcrumb;
|
|
|
|
-- Remove indexes and foreign key constraints, and disable triggers for faster updates
|
|
alter table comment disable trigger user;
|
|
|
|
alter table comment drop constraint if exists comment_creator_id_fkey;
|
|
alter table comment drop constraint if exists comment_parent_id_fkey;
|
|
alter table comment drop constraint if exists comment_post_id_fkey;
|
|
alter table comment drop constraint if exists idx_comment_ap_id;
|
|
|
|
drop index if exists idx_comment_creator;
|
|
drop index if exists idx_comment_parent;
|
|
drop index if exists idx_comment_post;
|
|
drop index if exists idx_comment_published;
|
|
|
|
-- Add the ltree column
|
|
update comment c
|
|
set path = ct.ltree_path
|
|
from comment_temp ct
|
|
where c.id = ct.id;
|
|
|
|
-- Update the child counts
|
|
update comment_aggregates ca set child_count = c2.child_count
|
|
from (
|
|
select c.id, c.path, count(c2.id) as child_count from comment c
|
|
left join comment c2 on c2.path <@ c.path and c2.path != c.path
|
|
group by c.id
|
|
) as c2
|
|
where ca.comment_id = c2.id;
|
|
|
|
-- Delete comments at a depth of > 150, otherwise the index creation below will fail
|
|
delete from comment where nlevel(path) > 150;
|
|
|
|
-- Delete from comment where there is a missing post
|
|
delete from comment c where not exists (
|
|
select from post p where p.id = c.post_id
|
|
);
|
|
|
|
-- Delete from comment where there is a missing creator_id
|
|
delete from comment c where not exists (
|
|
select from person p where p.id = c.creator_id
|
|
);
|
|
|
|
-- Re-enable old constraints and indexes
|
|
alter table comment add constraint "comment_creator_id_fkey" FOREIGN KEY (creator_id) REFERENCES person(id) ON UPDATE CASCADE ON DELETE CASCADE;
|
|
alter table comment add constraint "comment_post_id_fkey" FOREIGN KEY (post_id) REFERENCES post(id) ON UPDATE CASCADE ON DELETE CASCADE;
|
|
alter table comment add constraint "idx_comment_ap_id" unique (ap_id);
|
|
|
|
create index idx_comment_creator on comment (creator_id);
|
|
create index idx_comment_post on comment (post_id);
|
|
create index idx_comment_published on comment (published desc);
|
|
|
|
-- Create the index
|
|
create index idx_path_gist on comment using gist (path);
|
|
|
|
-- Drop the parent_id column
|
|
alter table comment drop column parent_id cascade;
|
|
|
|
alter table comment enable trigger user;
|