mirror of
https://github.com/LemmyNet/lemmy.git
synced 2024-11-24 15:26:20 +00:00
Adding a scaled sort, to boost smaller communities. (#3907)
* Adding a scaled sort, to boost smaller communities. - Previously referred to as *best* . - Fixes #3622 * Fixing scheduled task update. * Converting hot_rank integers to floats. * Altering hot_rank psql function to default to zero after a week. * Setting scaled_rank to zero, where hot_rank is zero. * Adding image_upload table.
This commit is contained in:
parent
4121fc4d56
commit
9785b20843
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@ -150,7 +150,7 @@ impl ActivityHandler for CreateOrUpdatePage {
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PostLike::like(&mut context.pool(), &like_form).await?;
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// Calculate initial hot_rank for post
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PostAggregates::update_hot_rank(&mut context.pool(), post.id).await?;
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PostAggregates::update_ranks(&mut context.pool(), post.id).await?;
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Ok(())
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}
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@ -1,10 +1,14 @@
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use crate::{
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aggregates::structs::PostAggregates,
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newtypes::PostId,
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schema::post_aggregates,
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utils::{functions::hot_rank, get_conn, DbPool},
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schema::{community_aggregates, post, post_aggregates},
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utils::{
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functions::{hot_rank, scaled_rank},
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get_conn,
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DbPool,
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},
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};
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use diesel::{result::Error, ExpressionMethods, QueryDsl};
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use diesel::{result::Error, ExpressionMethods, JoinOnDsl, QueryDsl};
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use diesel_async::RunQueryDsl;
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impl PostAggregates {
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@ -16,9 +20,19 @@ impl PostAggregates {
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.await
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}
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pub async fn update_hot_rank(pool: &mut DbPool<'_>, post_id: PostId) -> Result<Self, Error> {
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pub async fn update_ranks(pool: &mut DbPool<'_>, post_id: PostId) -> Result<Self, Error> {
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let conn = &mut get_conn(pool).await?;
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// Diesel can't update based on a join, which is necessary for the scaled_rank
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// https://github.com/diesel-rs/diesel/issues/1478
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// Just select the users_active_month manually for now, since its a single post anyway
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let users_active_month = community_aggregates::table
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.select(community_aggregates::users_active_month)
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.inner_join(post::table.on(community_aggregates::community_id.eq(post::community_id)))
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.filter(post::id.eq(post_id))
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.first::<i64>(conn)
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.await?;
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diesel::update(post_aggregates::table)
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.filter(post_aggregates::post_id.eq(post_id))
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.set((
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@ -27,6 +41,11 @@ impl PostAggregates {
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post_aggregates::score,
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post_aggregates::newest_comment_time_necro,
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)),
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post_aggregates::scaled_rank.eq(scaled_rank(
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post_aggregates::score,
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post_aggregates::published,
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users_active_month,
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)),
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))
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.get_result::<Self>(conn)
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.await
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@ -27,11 +27,11 @@ pub struct CommentAggregates {
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pub published: DateTime<Utc>,
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/// The total number of children in this comment branch.
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pub child_count: i32,
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pub hot_rank: i32,
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pub hot_rank: f64,
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pub controversy_rank: f64,
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}
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#[derive(PartialEq, Eq, Debug, Serialize, Deserialize, Clone)]
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#[derive(PartialEq, Debug, Serialize, Deserialize, Clone)]
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#[cfg_attr(feature = "full", derive(Queryable, Associations, Identifiable, TS))]
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#[cfg_attr(feature = "full", diesel(table_name = community_aggregates))]
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#[cfg_attr(
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@ -55,7 +55,7 @@ pub struct CommunityAggregates {
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pub users_active_month: i64,
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/// The number of users with any activity in the last year.
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pub users_active_half_year: i64,
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pub hot_rank: i32,
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pub hot_rank: f64,
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}
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#[derive(PartialEq, Eq, Debug, Serialize, Deserialize, Clone, Default)]
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@ -95,11 +95,13 @@ pub struct PostAggregates {
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pub featured_community: bool,
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/// If the post is featured on the site / to local.
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pub featured_local: bool,
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pub hot_rank: i32,
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pub hot_rank_active: i32,
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pub hot_rank: f64,
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pub hot_rank_active: f64,
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pub community_id: CommunityId,
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pub creator_id: PersonId,
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pub controversy_rank: f64,
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/// A rank that amplifies smaller communities
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pub scaled_rank: f64,
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}
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#[derive(PartialEq, Eq, Debug, Serialize, Deserialize, Clone)]
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@ -54,6 +54,7 @@ use ts_rs::TS;
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)]
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#[cfg_attr(feature = "full", DbValueStyle = "verbatim")]
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#[cfg_attr(feature = "full", ts(export))]
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// TODO add the controversial and scaled rankings to the doc below
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/// The post sort types. See here for descriptions: https://join-lemmy.org/docs/en/users/03-votes-and-ranking.html
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pub enum SortType {
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#[default]
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@ -75,6 +76,7 @@ pub enum SortType {
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TopSixMonths,
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TopNineMonths,
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Controversial,
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Scaled,
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}
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#[derive(EnumString, Display, Debug, Serialize, Deserialize, Clone, Copy)]
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@ -100,7 +100,7 @@ diesel::table! {
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downvotes -> Int8,
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published -> Timestamptz,
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child_count -> Int4,
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hot_rank -> Int4,
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hot_rank -> Float8,
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controversy_rank -> Float8,
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}
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}
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@ -198,7 +198,7 @@ diesel::table! {
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users_active_week -> Int8,
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users_active_month -> Int8,
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users_active_half_year -> Int8,
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hot_rank -> Int4,
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hot_rank -> Float8,
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}
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}
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@ -299,6 +299,16 @@ diesel::table! {
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}
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}
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diesel::table! {
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image_upload (id) {
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id -> Int4,
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local_user_id -> Int4,
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pictrs_alias -> Text,
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pictrs_delete_token -> Text,
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published -> Timestamptz,
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}
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}
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diesel::table! {
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instance (id) {
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id -> Int4,
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@ -683,11 +693,12 @@ diesel::table! {
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newest_comment_time -> Timestamptz,
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featured_community -> Bool,
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featured_local -> Bool,
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hot_rank -> Int4,
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hot_rank_active -> Int4,
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hot_rank -> Float8,
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hot_rank_active -> Float8,
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community_id -> Int4,
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creator_id -> Int4,
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controversy_rank -> Float8,
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scaled_rank -> Float8,
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}
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}
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@ -893,6 +904,7 @@ diesel::joinable!(custom_emoji_keyword -> custom_emoji (custom_emoji_id));
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diesel::joinable!(email_verification -> local_user (local_user_id));
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diesel::joinable!(federation_allowlist -> instance (instance_id));
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diesel::joinable!(federation_blocklist -> instance (instance_id));
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diesel::joinable!(image_upload -> local_user (local_user_id));
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diesel::joinable!(local_site -> site (site_id));
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diesel::joinable!(local_site_rate_limit -> local_site (local_site_id));
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diesel::joinable!(local_user -> person (person_id));
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@ -967,6 +979,7 @@ diesel::allow_tables_to_appear_in_same_query!(
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email_verification,
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federation_allowlist,
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federation_blocklist,
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image_upload,
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instance,
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language,
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local_site,
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@ -347,7 +347,7 @@ pub fn naive_now() -> DateTime<Utc> {
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pub fn post_to_comment_sort_type(sort: SortType) -> CommentSortType {
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match sort {
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SortType::Active | SortType::Hot => CommentSortType::Hot,
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SortType::Active | SortType::Hot | SortType::Scaled => CommentSortType::Hot,
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SortType::New | SortType::NewComments | SortType::MostComments => CommentSortType::New,
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SortType::Old => CommentSortType::Old,
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SortType::Controversial => CommentSortType::Controversial,
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@ -384,7 +384,11 @@ pub mod functions {
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use diesel::sql_types::{BigInt, Text, Timestamptz};
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sql_function! {
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fn hot_rank(score: BigInt, time: Timestamptz) -> Integer;
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fn hot_rank(score: BigInt, time: Timestamptz) -> Double;
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}
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sql_function! {
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fn scaled_rank(score: BigInt, time: Timestamptz, users_active_month: BigInt) -> Double;
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}
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sql_function! {
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@ -432,7 +432,7 @@ mod tests {
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downvotes: 0,
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published: agg.published,
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child_count: 0,
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hot_rank: 1728,
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hot_rank: 0.1728,
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controversy_rank: 0.0,
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},
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my_vote: None,
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@ -886,7 +886,7 @@ mod tests {
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downvotes: 0,
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published: agg.published,
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child_count: 5,
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hot_rank: 1728,
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hot_rank: 0.1728,
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controversy_rank: 0.0,
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},
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}
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@ -380,6 +380,9 @@ fn queries<'a>() -> Queries<
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SortType::Hot => query
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.then_order_by(post_aggregates::hot_rank.desc())
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.then_order_by(post_aggregates::published.desc()),
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SortType::Scaled => query
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.then_order_by(post_aggregates::scaled_rank.desc())
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.then_order_by(post_aggregates::published.desc()),
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SortType::Controversial => query.then_order_by(post_aggregates::controversy_rank.desc()),
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SortType::New => query.then_order_by(post_aggregates::published.desc()),
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SortType::Old => query.then_order_by(post_aggregates::published.asc()),
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@ -1154,9 +1157,10 @@ mod tests {
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newest_comment_time: inserted_post.published,
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featured_community: false,
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featured_local: false,
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hot_rank: 1728,
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hot_rank_active: 1728,
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hot_rank: 0.1728,
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hot_rank_active: 0.1728,
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controversy_rank: 0.0,
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scaled_rank: 0.3621,
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community_id: inserted_post.community_id,
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creator_id: inserted_post.creator_id,
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},
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@ -105,7 +105,7 @@ fn queries<'a>() -> Queries<
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}
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match options.sort.unwrap_or(Hot) {
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Hot | Active => query = query.order_by(community_aggregates::hot_rank.desc()),
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Hot | Active | Scaled => query = query.order_by(community_aggregates::hot_rank.desc()),
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NewComments | TopDay | TopTwelveHour | TopSixHour | TopHour => {
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query = query.order_by(community_aggregates::users_active_day.desc())
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}
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87
migrations/2023-08-23-182533_scaled_rank/down.sql
Normal file
87
migrations/2023-08-23-182533_scaled_rank/down.sql
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@ -0,0 +1,87 @@
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DROP FUNCTION scaled_rank;
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ALTER TABLE community_aggregates
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ALTER COLUMN hot_rank TYPE integer,
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ALTER COLUMN hot_rank SET DEFAULT 1728;
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ALTER TABLE comment_aggregates
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ALTER COLUMN hot_rank TYPE integer,
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ALTER COLUMN hot_rank SET DEFAULT 1728;
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ALTER TABLE post_aggregates
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ALTER COLUMN hot_rank TYPE integer,
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ALTER COLUMN hot_rank SET DEFAULT 1728,
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ALTER COLUMN hot_rank_active TYPE integer,
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ALTER COLUMN hot_rank_active SET DEFAULT 1728;
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-- Change back to integer version
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DROP FUNCTION hot_rank (numeric, published timestamp with time zone);
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CREATE OR REPLACE FUNCTION hot_rank (score numeric, published timestamp with time zone)
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RETURNS integer
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AS $$
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DECLARE
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hours_diff numeric := EXTRACT(EPOCH FROM (now() - published)) / 3600;
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BEGIN
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IF (hours_diff > 0) THEN
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RETURN floor(10000 * log(greatest (1, score + 3)) / power((hours_diff + 2), 1.8))::integer;
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ELSE
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-- if the post is from the future, set hot score to 0. otherwise you can game the post to
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-- always be on top even with only 1 vote by setting it to the future
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RETURN 0;
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END IF;
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END;
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$$
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LANGUAGE plpgsql
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IMMUTABLE PARALLEL SAFE;
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ALTER TABLE post_aggregates
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DROP COLUMN scaled_rank;
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-- The following code is necessary because postgres can't remove
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-- a single enum value.
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ALTER TABLE local_user
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ALTER default_sort_type DROP DEFAULT;
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UPDATE
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local_user
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SET
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default_sort_type = 'Hot'
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WHERE
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default_sort_type = 'Scaled';
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-- rename the old enum
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ALTER TYPE sort_type_enum RENAME TO sort_type_enum__;
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-- create the new enum
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CREATE TYPE sort_type_enum AS ENUM (
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'Active',
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'Hot',
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'New',
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'Old',
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'TopDay',
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'TopWeek',
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'TopMonth',
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'TopYear',
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'TopAll',
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'MostComments',
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'NewComments',
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'TopHour',
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'TopSixHour',
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'TopTwelveHour',
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'TopThreeMonths',
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'TopSixMonths',
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'TopNineMonths'
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);
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-- alter all your enum columns
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ALTER TABLE local_user
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ALTER COLUMN default_sort_type TYPE sort_type_enum
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USING default_sort_type::text::sort_type_enum;
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ALTER TABLE local_user
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ALTER default_sort_type SET DEFAULT 'Active';
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-- drop the old enum
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DROP TYPE sort_type_enum__;
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74
migrations/2023-08-23-182533_scaled_rank/up.sql
Normal file
74
migrations/2023-08-23-182533_scaled_rank/up.sql
Normal file
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@ -0,0 +1,74 @@
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-- Change hot ranks and functions from an int to a float
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ALTER TABLE community_aggregates
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ALTER COLUMN hot_rank TYPE float,
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ALTER COLUMN hot_rank SET DEFAULT 0.1728;
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ALTER TABLE comment_aggregates
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ALTER COLUMN hot_rank TYPE float,
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ALTER COLUMN hot_rank SET DEFAULT 0.1728;
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ALTER TABLE post_aggregates
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ALTER COLUMN hot_rank TYPE float,
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ALTER COLUMN hot_rank SET DEFAULT 0.1728,
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ALTER COLUMN hot_rank_active TYPE float,
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ALTER COLUMN hot_rank_active SET DEFAULT 0.1728;
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DROP FUNCTION hot_rank (numeric, published timestamp with time zone);
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CREATE OR REPLACE FUNCTION hot_rank (score numeric, published timestamp with time zone)
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RETURNS float
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AS $$
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DECLARE
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hours_diff numeric := EXTRACT(EPOCH FROM (now() - published)) / 3600;
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BEGIN
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-- 24 * 7 = 168, so after a week, it will default to 0.
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IF (hours_diff > 0 AND hours_diff < 168) THEN
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RETURN log(greatest (1, score + 3)) / power((hours_diff + 2), 1.8);
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ELSE
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-- if the post is from the future, set hot score to 0. otherwise you can game the post to
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-- always be on top even with only 1 vote by setting it to the future
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RETURN 0.0;
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END IF;
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END;
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$$
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LANGUAGE plpgsql
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IMMUTABLE PARALLEL SAFE;
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-- The new scaled rank function
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CREATE OR REPLACE FUNCTION scaled_rank (score numeric, published timestamp with time zone, users_active_month numeric)
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RETURNS float
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AS $$
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BEGIN
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-- Add 2 to avoid divide by zero errors
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-- Default for score = 1, active users = 1, and now, is (0.1728 / log(2 + 1)) = 0.3621
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-- There may need to be a scale factor multiplied to users_active_month, to make
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-- the log curve less pronounced. This can be tuned in the future.
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RETURN (hot_rank (score, published) / log(2 + users_active_month));
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END;
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$$
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LANGUAGE plpgsql
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IMMUTABLE PARALLEL SAFE;
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ALTER TABLE post_aggregates
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ADD COLUMN scaled_rank float NOT NULL DEFAULT 0.3621;
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UPDATE
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post_aggregates
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SET
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scaled_rank = 0
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WHERE
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hot_rank = 0
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OR hot_rank_active = 0;
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CREATE INDEX idx_post_aggregates_featured_community_scaled ON post_aggregates (featured_community DESC, scaled_rank DESC, published DESC);
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CREATE INDEX idx_post_aggregates_featured_local_scaled ON post_aggregates (featured_local DESC, scaled_rank DESC, published DESC);
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-- We forgot to add the controversial sort type
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ALTER TYPE sort_type_enum
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ADD VALUE 'Controversial';
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-- Add the Scaled enum
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ALTER TYPE sort_type_enum
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ADD VALUE 'Scaled';
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|
|
@ -154,22 +154,16 @@ fn startup_jobs(db_url: &str) {
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fn update_hot_ranks(conn: &mut PgConnection) {
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info!("Updating hot ranks for all history...");
|
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|
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process_hot_ranks_in_batches(
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conn,
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"post_aggregates",
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"a.hot_rank != 0 OR a.hot_rank_active != 0",
|
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"SET hot_rank = hot_rank(a.score, a.published),
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hot_rank_active = hot_rank(a.score, a.newest_comment_time_necro)",
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);
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process_post_aggregates_ranks_in_batches(conn);
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process_hot_ranks_in_batches(
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process_ranks_in_batches(
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conn,
|
||||
"comment_aggregates",
|
||||
"a.hot_rank != 0",
|
||||
"SET hot_rank = hot_rank(a.score, a.published)",
|
||||
);
|
||||
|
||||
process_hot_ranks_in_batches(
|
||||
process_ranks_in_batches(
|
||||
conn,
|
||||
"community_aggregates",
|
||||
"a.hot_rank != 0",
|
||||
|
@ -189,7 +183,7 @@ struct HotRanksUpdateResult {
|
|||
/// In `where_clause` and `set_clause`, "a" will refer to the current aggregates table.
|
||||
/// Locked rows are skipped in order to prevent deadlocks (they will likely get updated on the next
|
||||
/// run)
|
||||
fn process_hot_ranks_in_batches(
|
||||
fn process_ranks_in_batches(
|
||||
conn: &mut PgConnection,
|
||||
table_name: &str,
|
||||
where_clause: &str,
|
||||
|
@ -241,6 +235,55 @@ fn process_hot_ranks_in_batches(
|
|||
);
|
||||
}
|
||||
|
||||
/// Post aggregates is a special case, since it needs to join to the community_aggregates
|
||||
/// table, to get the active monthly user counts.
|
||||
fn process_post_aggregates_ranks_in_batches(conn: &mut PgConnection) {
|
||||
let process_start_time: DateTime<Utc> = Utc
|
||||
.timestamp_opt(0, 0)
|
||||
.single()
|
||||
.expect("0 timestamp creation");
|
||||
|
||||
let update_batch_size = 1000; // Bigger batches than this tend to cause seq scans
|
||||
let mut processed_rows_count = 0;
|
||||
let mut previous_batch_result = Some(process_start_time);
|
||||
while let Some(previous_batch_last_published) = previous_batch_result {
|
||||
let result = sql_query(
|
||||
r#"WITH batch AS (SELECT pa.id
|
||||
FROM post_aggregates pa
|
||||
WHERE pa.published > $1
|
||||
AND (pa.hot_rank != 0 OR pa.hot_rank_active != 0)
|
||||
ORDER BY pa.published
|
||||
LIMIT $2
|
||||
FOR UPDATE SKIP LOCKED)
|
||||
UPDATE post_aggregates pa
|
||||
SET hot_rank = hot_rank(pa.score, pa.published),
|
||||
hot_rank_active = hot_rank(pa.score, pa.newest_comment_time_necro),
|
||||
scaled_rank = scaled_rank(pa.score, pa.published, ca.users_active_month)
|
||||
FROM batch, community_aggregates ca
|
||||
WHERE pa.id = batch.id and pa.community_id = ca.community_id RETURNING pa.published;
|
||||
"#,
|
||||
)
|
||||
.bind::<Timestamptz, _>(previous_batch_last_published)
|
||||
.bind::<Integer, _>(update_batch_size)
|
||||
.get_results::<HotRanksUpdateResult>(conn);
|
||||
|
||||
match result {
|
||||
Ok(updated_rows) => {
|
||||
processed_rows_count += updated_rows.len();
|
||||
previous_batch_result = updated_rows.last().map(|row| row.published);
|
||||
}
|
||||
Err(e) => {
|
||||
error!("Failed to update {} hot_ranks: {}", "post_aggregates", e);
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
info!(
|
||||
"Finished process_hot_ranks_in_batches execution for {} (processed {} rows)",
|
||||
"post_aggregates", processed_rows_count
|
||||
);
|
||||
}
|
||||
|
||||
fn delete_expired_captcha_answers(conn: &mut PgConnection) {
|
||||
diesel::delete(
|
||||
captcha_answer::table.filter(captcha_answer::published.lt(now() - IntervalDsl::minutes(10))),
|
||||
|
|
Loading…
Reference in a new issue