From: Pavlos Smith <57727226+iByteABit256@users.noreply.github.com> Date: Wed, 26 Jul 2023 17:07:05 +0000 (+0300) Subject: Add controversial ranking (#3205) X-Git-Url: http://these/git/%22https:/image.com/%22?a=commitdiff_plain;h=c890797b370417b9479186acd86bc065693f8691;p=lemmy.git Add controversial ranking (#3205) * Added controversy rank property to posts and comments, and ability to sort by it * Triggers instead of schedules tasks, integer -> double, TODO: comments don't seem to get updated with floats, divide SortTypes * Created PersonSortType * PersonSortType::MostComments case * Removed unused PartialOrd trait * Added new person sort type mappings * SortType -> PersonSortType * fixes * cargo fmt * fixes after merge with main * Fixed bug in controversy rank trigger, removed TopX sorts from PersonSortType and added CommentScore instead * Uncovered enum case * clippy * reset translation changes * translations * translations * Added additional hot ordering on controversial posts and comments * featured local and featured community added to controversy rank index, additional order_by removed (?), added post_score and post_count to PersonSortType * Woodpecker rerun * cargo fmt * woodpecker rerun * fixed controversy_rank order * fix * Readded migration as latest, removed second update statement for setting controversy rank --- diff --git a/crates/apub/src/api/search.rs b/crates/apub/src/api/search.rs index ca84606f..aaea69e0 100644 --- a/crates/apub/src/api/search.rs +++ b/crates/apub/src/api/search.rs @@ -8,7 +8,7 @@ use lemmy_api_common::{ }; use lemmy_db_schema::{ source::{community::Community, local_site::LocalSite}, - utils::post_to_comment_sort_type, + utils::{post_to_comment_sort_type, post_to_person_sort_type}, SearchType, }; use lemmy_db_views::{comment_view::CommentQuery, post_view::PostQuery}; @@ -98,7 +98,7 @@ pub async fn search( } SearchType::Users => { users = PersonQuery { - sort: (sort), + sort: (sort.map(post_to_person_sort_type)), search_term: (Some(q)), page: (page), limit: (limit), @@ -168,7 +168,7 @@ pub async fn search( vec![] } else { PersonQuery { - sort: (sort), + sort: (sort.map(post_to_person_sort_type)), search_term: (Some(q)), page: (page), limit: (limit), diff --git a/crates/db_schema/src/aggregates/structs.rs b/crates/db_schema/src/aggregates/structs.rs index 1af94a80..3b3612bb 100644 --- a/crates/db_schema/src/aggregates/structs.rs +++ b/crates/db_schema/src/aggregates/structs.rs @@ -12,7 +12,7 @@ use serde::{Deserialize, Serialize}; #[cfg(feature = "full")] use ts_rs::TS; -#[derive(PartialEq, Eq, Debug, Serialize, Deserialize, Clone)] +#[derive(PartialEq, Debug, Serialize, Deserialize, Clone)] #[cfg_attr(feature = "full", derive(Queryable, Associations, Identifiable, TS))] #[cfg_attr(feature = "full", diesel(table_name = comment_aggregates))] #[cfg_attr(feature = "full", diesel(belongs_to(crate::source::comment::Comment)))] @@ -28,6 +28,7 @@ pub struct CommentAggregates { /// The total number of children in this comment branch. pub child_count: i32, pub hot_rank: i32, + pub controversy_rank: f64, } #[derive(PartialEq, Eq, Debug, Serialize, Deserialize, Clone)] @@ -72,7 +73,7 @@ pub struct PersonAggregates { pub comment_score: i64, } -#[derive(PartialEq, Eq, Debug, Serialize, Deserialize, Clone)] +#[derive(PartialEq, Debug, Serialize, Deserialize, Clone)] #[cfg_attr(feature = "full", derive(Queryable, Associations, Identifiable, TS))] #[cfg_attr(feature = "full", diesel(table_name = post_aggregates))] #[cfg_attr(feature = "full", diesel(belongs_to(crate::source::post::Post)))] @@ -98,6 +99,7 @@ pub struct PostAggregates { pub hot_rank_active: i32, pub community_id: CommunityId, pub creator_id: PersonId, + pub controversy_rank: f64, } #[derive(PartialEq, Eq, Debug, Serialize, Deserialize, Clone)] diff --git a/crates/db_schema/src/lib.rs b/crates/db_schema/src/lib.rs index acb069ca..e5b86fe1 100644 --- a/crates/db_schema/src/lib.rs +++ b/crates/db_schema/src/lib.rs @@ -66,6 +66,7 @@ pub enum SortType { TopThreeMonths, TopSixMonths, TopNineMonths, + Controversial, } #[derive(EnumString, Display, Debug, Serialize, Deserialize, Clone, Copy)] @@ -77,6 +78,20 @@ pub enum CommentSortType { Top, New, Old, + Controversial, +} + +#[derive(EnumString, Display, Debug, Serialize, Deserialize, Clone, Copy)] +#[cfg_attr(feature = "full", derive(TS))] +#[cfg_attr(feature = "full", ts(export))] +/// The person sort types. See here for descriptions: https://join-lemmy.org/docs/en/users/03-votes-and-ranking.html +pub enum PersonSortType { + New, + Old, + MostComments, + CommentScore, + PostScore, + PostCount, } #[derive(EnumString, Display, Debug, Serialize, Deserialize, Clone, Copy, PartialEq, Eq)] diff --git a/crates/db_schema/src/schema.rs b/crates/db_schema/src/schema.rs index faebe999..d6e2cf69 100644 --- a/crates/db_schema/src/schema.rs +++ b/crates/db_schema/src/schema.rs @@ -93,6 +93,7 @@ diesel::table! { published -> Timestamp, child_count -> Int4, hot_rank -> Int4, + controversy_rank -> Float8, } } @@ -676,6 +677,7 @@ diesel::table! { hot_rank_active -> Int4, community_id -> Int4, creator_id -> Int4, + controversy_rank -> Float8, } } diff --git a/crates/db_schema/src/utils.rs b/crates/db_schema/src/utils.rs index 94c867d6..cd2005ad 100644 --- a/crates/db_schema/src/utils.rs +++ b/crates/db_schema/src/utils.rs @@ -3,6 +3,7 @@ use crate::{ diesel_migrations::MigrationHarness, newtypes::DbUrl, CommentSortType, + PersonSortType, SortType, }; use activitypub_federation::{fetch::object_id::ObjectId, traits::Object}; @@ -347,6 +348,7 @@ pub fn post_to_comment_sort_type(sort: SortType) -> CommentSortType { SortType::Active | SortType::Hot => CommentSortType::Hot, SortType::New | SortType::NewComments | SortType::MostComments => CommentSortType::New, SortType::Old => CommentSortType::Old, + SortType::Controversial => CommentSortType::Controversial, SortType::TopHour | SortType::TopSixHour | SortType::TopTwelveHour @@ -361,6 +363,16 @@ pub fn post_to_comment_sort_type(sort: SortType) -> CommentSortType { } } +pub fn post_to_person_sort_type(sort: SortType) -> PersonSortType { + match sort { + SortType::Active | SortType::Hot | SortType::Controversial => PersonSortType::CommentScore, + SortType::New | SortType::NewComments => PersonSortType::New, + SortType::MostComments => PersonSortType::MostComments, + SortType::Old => PersonSortType::Old, + _ => PersonSortType::CommentScore, + } +} + static EMAIL_REGEX: Lazy = Lazy::new(|| { Regex::new(r"^[a-zA-Z0-9.!#$%&’*+/=?^_`{|}~-]+@[a-zA-Z0-9-]+(?:\.[a-zA-Z0-9-]+)*$") .expect("compile email regex") @@ -373,6 +385,10 @@ pub mod functions { fn hot_rank(score: BigInt, time: Timestamp) -> Integer; } + sql_function! { + fn controversy_rank(upvotes: BigInt, downvotes: BigInt, score: BigInt) -> Double; + } + sql_function!(fn lower(x: Text) -> Text); } diff --git a/crates/db_views/src/comment_report_view.rs b/crates/db_views/src/comment_report_view.rs index a09971db..0b1821c1 100644 --- a/crates/db_views/src/comment_report_view.rs +++ b/crates/db_views/src/comment_report_view.rs @@ -478,6 +478,7 @@ mod tests { published: agg.published, child_count: 0, hot_rank: 1728, + controversy_rank: 0.0, }, my_vote: None, resolver: None, diff --git a/crates/db_views/src/comment_view.rs b/crates/db_views/src/comment_view.rs index 6e06e1ba..2d233438 100644 --- a/crates/db_views/src/comment_view.rs +++ b/crates/db_views/src/comment_view.rs @@ -366,6 +366,9 @@ impl<'a> CommentQuery<'a> { CommentSortType::Hot => query .then_order_by(comment_aggregates::hot_rank.desc()) .then_order_by(comment_aggregates::score.desc()), + CommentSortType::Controversial => { + query.then_order_by(comment_aggregates::controversy_rank.desc()) + } CommentSortType::New => query.then_order_by(comment::published.desc()), CommentSortType::Old => query.then_order_by(comment::published.asc()), CommentSortType::Top => query.order_by(comment_aggregates::score.desc()), @@ -948,6 +951,7 @@ mod tests { published: agg.published, child_count: 5, hot_rank: 1728, + controversy_rank: 0.0, }, } } diff --git a/crates/db_views/src/post_report_view.rs b/crates/db_views/src/post_report_view.rs index a53762e2..8c47d8c5 100644 --- a/crates/db_views/src/post_report_view.rs +++ b/crates/db_views/src/post_report_view.rs @@ -470,6 +470,7 @@ mod tests { featured_local: false, hot_rank: 1728, hot_rank_active: 1728, + controversy_rank: 0.0, community_id: inserted_post.community_id, creator_id: inserted_post.creator_id, }, diff --git a/crates/db_views/src/post_view.rs b/crates/db_views/src/post_view.rs index d2f6ab75..e0f481ed 100644 --- a/crates/db_views/src/post_view.rs +++ b/crates/db_views/src/post_view.rs @@ -422,6 +422,7 @@ impl<'a> PostQuery<'a> { SortType::Hot => query .then_order_by(post_aggregates::hot_rank.desc()) .then_order_by(post_aggregates::published.desc()), + SortType::Controversial => query.then_order_by(post_aggregates::controversy_rank.desc()), SortType::New => query.then_order_by(post_aggregates::published.desc()), SortType::Old => query.then_order_by(post_aggregates::published.asc()), SortType::NewComments => query.then_order_by(post_aggregates::newest_comment_time.desc()), @@ -1141,6 +1142,7 @@ mod tests { featured_local: false, hot_rank: 1728, hot_rank_active: 1728, + controversy_rank: 0.0, community_id: inserted_post.community_id, creator_id: inserted_post.creator_id, }, diff --git a/crates/db_views/src/structs.rs b/crates/db_views/src/structs.rs index 40329290..536dd359 100644 --- a/crates/db_views/src/structs.rs +++ b/crates/db_views/src/structs.rs @@ -25,7 +25,7 @@ use serde_with::skip_serializing_none; use ts_rs::TS; #[skip_serializing_none] -#[derive(Debug, PartialEq, Eq, Serialize, Deserialize, Clone)] +#[derive(Debug, PartialEq, Serialize, Deserialize, Clone)] #[cfg_attr(feature = "full", derive(TS))] #[cfg_attr(feature = "full", ts(export))] /// A comment report view. @@ -43,7 +43,7 @@ pub struct CommentReportView { } #[skip_serializing_none] -#[derive(Debug, PartialEq, Eq, Serialize, Deserialize, Clone)] +#[derive(Debug, PartialEq, Serialize, Deserialize, Clone)] #[cfg_attr(feature = "full", derive(TS))] #[cfg_attr(feature = "full", ts(export))] /// A comment view. @@ -71,7 +71,7 @@ pub struct LocalUserView { } #[skip_serializing_none] -#[derive(Debug, PartialEq, Eq, Serialize, Deserialize, Clone)] +#[derive(Debug, PartialEq, Serialize, Deserialize, Clone)] #[cfg_attr(feature = "full", derive(TS))] #[cfg_attr(feature = "full", ts(export))] /// A post report view. @@ -88,7 +88,7 @@ pub struct PostReportView { } #[skip_serializing_none] -#[derive(Debug, PartialEq, Eq, Serialize, Deserialize, Clone)] +#[derive(Debug, PartialEq, Serialize, Deserialize, Clone)] #[cfg_attr(feature = "full", derive(TS))] #[cfg_attr(feature = "full", ts(export))] /// A post view. diff --git a/crates/db_views_actor/src/comment_reply_view.rs b/crates/db_views_actor/src/comment_reply_view.rs index 4d7a8eac..406bfcb9 100644 --- a/crates/db_views_actor/src/comment_reply_view.rs +++ b/crates/db_views_actor/src/comment_reply_view.rs @@ -266,6 +266,9 @@ impl CommentReplyQuery { query = match self.sort.unwrap_or(CommentSortType::New) { CommentSortType::Hot => query.then_order_by(comment_aggregates::hot_rank.desc()), + CommentSortType::Controversial => { + query.then_order_by(comment_aggregates::controversy_rank.desc()) + } CommentSortType::New => query.then_order_by(comment_reply::published.desc()), CommentSortType::Old => query.then_order_by(comment_reply::published.asc()), CommentSortType::Top => query.order_by(comment_aggregates::score.desc()), diff --git a/crates/db_views_actor/src/community_view.rs b/crates/db_views_actor/src/community_view.rs index 64dc0909..c31a2bd5 100644 --- a/crates/db_views_actor/src/community_view.rs +++ b/crates/db_views_actor/src/community_view.rs @@ -170,7 +170,8 @@ impl<'a> CommunityQuery<'a> { } New => query = query.order_by(community::published.desc()), Old => query = query.order_by(community::published.asc()), - MostComments => query = query.order_by(community_aggregates::comments.desc()), + // Controversial is temporary until a CommentSortType is created + MostComments | Controversial => query = query.order_by(community_aggregates::comments.desc()), TopAll | TopYear | TopNineMonths => { query = query.order_by(community_aggregates::subscribers.desc()) } diff --git a/crates/db_views_actor/src/person_mention_view.rs b/crates/db_views_actor/src/person_mention_view.rs index 3e142254..6bf107a3 100644 --- a/crates/db_views_actor/src/person_mention_view.rs +++ b/crates/db_views_actor/src/person_mention_view.rs @@ -271,6 +271,9 @@ impl PersonMentionQuery { query = match self.sort.unwrap_or(CommentSortType::Hot) { CommentSortType::Hot => query.then_order_by(comment_aggregates::hot_rank.desc()), + CommentSortType::Controversial => { + query.then_order_by(comment_aggregates::controversy_rank.desc()) + } CommentSortType::New => query.then_order_by(comment::published.desc()), CommentSortType::Old => query.then_order_by(comment::published.asc()), CommentSortType::Top => query.order_by(comment_aggregates::score.desc()), diff --git a/crates/db_views_actor/src/person_view.rs b/crates/db_views_actor/src/person_view.rs index e6baa1fc..908fbaab 100644 --- a/crates/db_views_actor/src/person_view.rs +++ b/crates/db_views_actor/src/person_view.rs @@ -1,6 +1,6 @@ use crate::structs::PersonView; use diesel::{ - dsl::{now, IntervalDsl}, + dsl::now, result::Error, BoolExpressionMethods, ExpressionMethods, @@ -16,7 +16,7 @@ use lemmy_db_schema::{ source::person::Person, traits::JoinView, utils::{fuzzy_search, get_conn, limit_and_offset, DbPool}, - SortType, + PersonSortType, }; use std::iter::Iterator; @@ -80,7 +80,7 @@ impl PersonView { #[derive(Default)] pub struct PersonQuery { - pub sort: Option, + pub sort: Option, pub search_term: Option, pub page: Option, pub limit: Option, @@ -101,43 +101,13 @@ impl PersonQuery { .or_filter(person::display_name.ilike(searcher)); } - query = match self.sort.unwrap_or(SortType::Hot) { - SortType::New | SortType::NewComments => query.order_by(person::published.desc()), - SortType::Old => query.order_by(person::published.asc()), - SortType::Hot | SortType::Active | SortType::TopAll => { - query.order_by(person_aggregates::comment_score.desc()) - } - SortType::MostComments => query.order_by(person_aggregates::comment_count.desc()), - SortType::TopYear => query - .filter(person::published.gt(now - 1.years())) - .order_by(person_aggregates::comment_score.desc()), - SortType::TopMonth => query - .filter(person::published.gt(now - 1.months())) - .order_by(person_aggregates::comment_score.desc()), - SortType::TopWeek => query - .filter(person::published.gt(now - 1.weeks())) - .order_by(person_aggregates::comment_score.desc()), - SortType::TopDay => query - .filter(person::published.gt(now - 1.days())) - .order_by(person_aggregates::comment_score.desc()), - SortType::TopHour => query - .filter(person::published.gt(now - 1.hours())) - .order_by(person_aggregates::comment_score.desc()), - SortType::TopSixHour => query - .filter(person::published.gt(now - 6.hours())) - .order_by(person_aggregates::comment_score.desc()), - SortType::TopTwelveHour => query - .filter(person::published.gt(now - 12.hours())) - .order_by(person_aggregates::comment_score.desc()), - SortType::TopThreeMonths => query - .filter(person::published.gt(now - 3.months())) - .order_by(person_aggregates::comment_score.desc()), - SortType::TopSixMonths => query - .filter(person::published.gt(now - 6.months())) - .order_by(person_aggregates::comment_score.desc()), - SortType::TopNineMonths => query - .filter(person::published.gt(now - 9.months())) - .order_by(person_aggregates::comment_score.desc()), + query = match self.sort.unwrap_or(PersonSortType::CommentScore) { + PersonSortType::New => query.order_by(person::published.desc()), + PersonSortType::Old => query.order_by(person::published.asc()), + PersonSortType::MostComments => query.order_by(person_aggregates::comment_count.desc()), + PersonSortType::CommentScore => query.order_by(person_aggregates::comment_score.desc()), + PersonSortType::PostScore => query.order_by(person_aggregates::post_score.desc()), + PersonSortType::PostCount => query.order_by(person_aggregates::post_count.desc()), }; let (limit, offset) = limit_and_offset(self.page, self.limit)?; diff --git a/crates/db_views_actor/src/structs.rs b/crates/db_views_actor/src/structs.rs index 74d3fbe8..35391776 100644 --- a/crates/db_views_actor/src/structs.rs +++ b/crates/db_views_actor/src/structs.rs @@ -70,7 +70,7 @@ pub struct PersonBlockView { } #[skip_serializing_none] -#[derive(Debug, PartialEq, Eq, Serialize, Deserialize, Clone)] +#[derive(Debug, PartialEq, Serialize, Deserialize, Clone)] #[cfg_attr(feature = "full", derive(TS))] #[cfg_attr(feature = "full", ts(export))] /// A person mention view. @@ -90,7 +90,7 @@ pub struct PersonMentionView { } #[skip_serializing_none] -#[derive(Debug, PartialEq, Eq, Serialize, Deserialize, Clone)] +#[derive(Debug, PartialEq, Serialize, Deserialize, Clone)] #[cfg_attr(feature = "full", derive(TS))] #[cfg_attr(feature = "full", ts(export))] /// A comment reply view. diff --git a/migrations/2023-07-26-000217_create_controversial_indexes/down.sql b/migrations/2023-07-26-000217_create_controversial_indexes/down.sql new file mode 100644 index 00000000..a355546d --- /dev/null +++ b/migrations/2023-07-26-000217_create_controversial_indexes/down.sql @@ -0,0 +1,63 @@ +-- Update comment_aggregates_score trigger function to exclude controversy_rank update +create or replace function comment_aggregates_score() +returns trigger language plpgsql +as $$ +begin + IF (TG_OP = 'INSERT') THEN + update comment_aggregates ca + set score = score + NEW.score, + upvotes = case when NEW.score = 1 then upvotes + 1 else upvotes end, + downvotes = case when NEW.score = -1 then downvotes + 1 else downvotes end + where ca.comment_id = NEW.comment_id; + + ELSIF (TG_OP = 'DELETE') THEN + -- Join to comment because that comment may not exist anymore + update comment_aggregates ca + set score = score - OLD.score, + upvotes = case when OLD.score = 1 then upvotes - 1 else upvotes end, + downvotes = case when OLD.score = -1 then downvotes - 1 else downvotes end + from comment c + where ca.comment_id = c.id + and ca.comment_id = OLD.comment_id; + + END IF; + return null; +end $$; + +-- Update post_aggregates_score trigger function to exclude controversy_rank update +create or replace function post_aggregates_score() +returns trigger language plpgsql +as $$ +begin + IF (TG_OP = 'INSERT') THEN + update post_aggregates pa + set score = score + NEW.score, + upvotes = case when NEW.score = 1 then upvotes + 1 else upvotes end, + downvotes = case when NEW.score = -1 then downvotes + 1 else downvotes end + where pa.post_id = NEW.post_id; + + ELSIF (TG_OP = 'DELETE') THEN + -- Join to post because that post may not exist anymore + update post_aggregates pa + set score = score - OLD.score, + upvotes = case when OLD.score = 1 then upvotes - 1 else upvotes end, + downvotes = case when OLD.score = -1 then downvotes - 1 else downvotes end + from post p + where pa.post_id = p.id + and pa.post_id = OLD.post_id; + END IF; + return null; +end $$; + +-- Drop the indexes +drop index if exists idx_post_aggregates_featured_local_controversy; +drop index if exists idx_post_aggregates_featured_community_controversy; +drop index if exists idx_comment_aggregates_controversy; + +-- Remove the added columns from the tables +alter table post_aggregates drop column controversy_rank; +alter table comment_aggregates drop column controversy_rank; + +-- Remove function +drop function controversy_rank(numeric, numeric); + diff --git a/migrations/2023-07-26-000217_create_controversial_indexes/up.sql b/migrations/2023-07-26-000217_create_controversial_indexes/up.sql new file mode 100644 index 00000000..f50a706b --- /dev/null +++ b/migrations/2023-07-26-000217_create_controversial_indexes/up.sql @@ -0,0 +1,97 @@ +-- Need to add immutable to the controversy_rank function in order to index by it + +-- Controversy Rank: +-- if downvotes <= 0 or upvotes <= 0: +-- 0 +-- else: +-- (upvotes + downvotes) * min(upvotes, downvotes) / max(upvotes, downvotes) +create or replace function controversy_rank(upvotes numeric, downvotes numeric) +returns float as $$ +begin + if downvotes <= 0 or upvotes <= 0 then + return 0; + else + return (upvotes + downvotes) * + case when upvotes > downvotes + then downvotes::float / upvotes::float + else upvotes::float / downvotes::float + end; + end if; +end; $$ +LANGUAGE plpgsql +IMMUTABLE; + +-- Aggregates +alter table post_aggregates add column controversy_rank float not null default 0; +alter table comment_aggregates add column controversy_rank float not null default 0; + +-- Populate them initially +-- Note: After initial population, these are updated with vote triggers +update post_aggregates set controversy_rank = controversy_rank(upvotes::numeric, downvotes::numeric); +update comment_aggregates set controversy_rank = controversy_rank(upvotes::numeric, downvotes::numeric); + +-- Create single column indexes +create index idx_post_aggregates_featured_local_controversy on post_aggregates (featured_local desc, controversy_rank desc); +create index idx_post_aggregates_featured_community_controversy on post_aggregates (featured_community desc, controversy_rank desc); +create index idx_comment_aggregates_controversy on comment_aggregates (controversy_rank desc); + +-- Update post_aggregates_score trigger function to include controversy_rank update +create or replace function post_aggregates_score() +returns trigger language plpgsql +as $$ +begin + IF (TG_OP = 'INSERT') THEN + update post_aggregates pa + set score = score + NEW.score, + upvotes = case when NEW.score = 1 then upvotes + 1 else upvotes end, + downvotes = case when NEW.score = -1 then downvotes + 1 else downvotes end, + controversy_rank = controversy_rank(pa.upvotes + case when NEW.score = 1 then 1 else 0 end::numeric, + pa.downvotes + case when NEW.score = -1 then 1 else 0 end::numeric) + where pa.post_id = NEW.post_id; + + ELSIF (TG_OP = 'DELETE') THEN + -- Join to post because that post may not exist anymore + update post_aggregates pa + set score = score - OLD.score, + upvotes = case when OLD.score = 1 then upvotes - 1 else upvotes end, + downvotes = case when OLD.score = -1 then downvotes - 1 else downvotes end, + controversy_rank = controversy_rank(pa.upvotes + case when NEW.score = 1 then 1 else 0 end::numeric, + pa.downvotes + case when NEW.score = -1 then 1 else 0 end::numeric) + from post p + where pa.post_id = p.id + and pa.post_id = OLD.post_id; + + END IF; + return null; +end $$; + +-- Update comment_aggregates_score trigger function to include controversy_rank update +create or replace function comment_aggregates_score() +returns trigger language plpgsql +as $$ +begin + IF (TG_OP = 'INSERT') THEN + update comment_aggregates ca + set score = score + NEW.score, + upvotes = case when NEW.score = 1 then upvotes + 1 else upvotes end, + downvotes = case when NEW.score = -1 then downvotes + 1 else downvotes end, + controversy_rank = controversy_rank(ca.upvotes + case when NEW.score = 1 then 1 else 0 end::numeric, + ca.downvotes + case when NEW.score = -1 then 1 else 0 end::numeric) + where ca.comment_id = NEW.comment_id; + + ELSIF (TG_OP = 'DELETE') THEN + -- Join to comment because that comment may not exist anymore + update comment_aggregates ca + set score = score - OLD.score, + upvotes = case when OLD.score = 1 then upvotes - 1 else upvotes end, + downvotes = case when OLD.score = -1 then downvotes - 1 else downvotes end, + controversy_rank = controversy_rank(ca.upvotes + case when NEW.score = 1 then 1 else 0 end::numeric, + ca.downvotes + case when NEW.score = -1 then 1 else 0 end::numeric) + from comment c + where ca.comment_id = c.id + and ca.comment_id = OLD.comment_id; + + END IF; + return null; +end $$; +