From: Sander Saarend <sander@saarend.com>
Date: Tue, 20 Jun 2023 08:52:51 +0000 (+0300)
Subject: Calculate initial hot_rank and hot_rank_active for posts and comments from other... 
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Calculate initial hot_rank and hot_rank_active for posts and comments from other instances (#3131)

* Calculate initial hot_rank when receiving posts and comments from other instances

* Move hot rank update logic into db_schema
---

diff --git a/crates/apub/src/activities/create_or_update/comment.rs b/crates/apub/src/activities/create_or_update/comment.rs
index 814ec0f8..e9e56733 100644
--- a/crates/apub/src/activities/create_or_update/comment.rs
+++ b/crates/apub/src/activities/create_or_update/comment.rs
@@ -30,6 +30,7 @@ use lemmy_api_common::{
   utils::{check_post_deleted_or_removed, is_mod_or_admin},
 };
 use lemmy_db_schema::{
+  aggregates::structs::CommentAggregates,
   newtypes::PersonId,
   source::{
     comment::{Comment, CommentLike, CommentLikeForm},
@@ -191,6 +192,9 @@ impl ActivityHandler for CreateOrUpdateNote {
     };
     CommentLike::like(context.pool(), &like_form).await?;
 
+    // Calculate initial hot_rank
+    CommentAggregates::update_hot_rank(context.pool(), comment.id).await?;
+
     let do_send_email = self.kind == CreateOrUpdateType::Create;
     let post_id = comment.post_id;
     let post = Post::read(context.pool(), post_id).await?;
diff --git a/crates/apub/src/activities/create_or_update/post.rs b/crates/apub/src/activities/create_or_update/post.rs
index f2923bfb..916111fc 100644
--- a/crates/apub/src/activities/create_or_update/post.rs
+++ b/crates/apub/src/activities/create_or_update/post.rs
@@ -27,6 +27,7 @@ use lemmy_api_common::{
   post::{CreatePost, EditPost, PostResponse},
 };
 use lemmy_db_schema::{
+  aggregates::structs::PostAggregates,
   newtypes::PersonId,
   source::{
     community::Community,
@@ -187,6 +188,10 @@ impl ActivityHandler for CreateOrUpdatePage {
       score: 1,
     };
     PostLike::like(context.pool(), &like_form).await?;
+
+    // Calculate initial hot_rank for post
+    PostAggregates::update_hot_rank(context.pool(), post.id).await?;
+
     Ok(())
   }
 }
diff --git a/crates/db_schema/src/aggregates/comment_aggregates.rs b/crates/db_schema/src/aggregates/comment_aggregates.rs
index f56fd8cb..5a5550a2 100644
--- a/crates/db_schema/src/aggregates/comment_aggregates.rs
+++ b/crates/db_schema/src/aggregates/comment_aggregates.rs
@@ -2,7 +2,7 @@ use crate::{
   aggregates::structs::CommentAggregates,
   newtypes::CommentId,
   schema::comment_aggregates,
-  utils::{get_conn, DbPool},
+  utils::{functions::hot_rank, get_conn, DbPool},
 };
 use diesel::{result::Error, ExpressionMethods, QueryDsl};
 use diesel_async::RunQueryDsl;
@@ -15,6 +15,19 @@ impl CommentAggregates {
       .first::<Self>(conn)
       .await
   }
+
+  pub async fn update_hot_rank(pool: &DbPool, comment_id: CommentId) -> Result<Self, Error> {
+    let conn = &mut get_conn(pool).await?;
+
+    diesel::update(comment_aggregates::table)
+      .filter(comment_aggregates::comment_id.eq(comment_id))
+      .set(comment_aggregates::hot_rank.eq(hot_rank(
+        comment_aggregates::score,
+        comment_aggregates::published,
+      )))
+      .get_result::<Self>(conn)
+      .await
+  }
 }
 
 #[cfg(test)]
diff --git a/crates/db_schema/src/aggregates/post_aggregates.rs b/crates/db_schema/src/aggregates/post_aggregates.rs
index 848f2014..176f694a 100644
--- a/crates/db_schema/src/aggregates/post_aggregates.rs
+++ b/crates/db_schema/src/aggregates/post_aggregates.rs
@@ -2,7 +2,7 @@ use crate::{
   aggregates::structs::PostAggregates,
   newtypes::PostId,
   schema::post_aggregates,
-  utils::{get_conn, DbPool},
+  utils::{functions::hot_rank, get_conn, DbPool},
 };
 use diesel::{result::Error, ExpressionMethods, QueryDsl};
 use diesel_async::RunQueryDsl;
@@ -15,6 +15,22 @@ impl PostAggregates {
       .first::<Self>(conn)
       .await
   }
+
+  pub async fn update_hot_rank(pool: &DbPool, post_id: PostId) -> Result<Self, Error> {
+    let conn = &mut get_conn(pool).await?;
+
+    diesel::update(post_aggregates::table)
+      .filter(post_aggregates::post_id.eq(post_id))
+      .set((
+        post_aggregates::hot_rank.eq(hot_rank(post_aggregates::score, post_aggregates::published)),
+        post_aggregates::hot_rank_active.eq(hot_rank(
+          post_aggregates::score,
+          post_aggregates::newest_comment_time_necro,
+        )),
+      ))
+      .get_result::<Self>(conn)
+      .await
+  }
 }
 
 #[cfg(test)]