support sort by n_attention

migrations/postgres/2023-05-05-135236_post_add_index_for_attentions/down.sql

@@ -0,0 +1,2 @@
+-- This file should undo anything in `up.sql`
+DROP INDEX posts_attention_idx

migrations/postgres/2023-05-05-135236_post_add_index_for_attentions/up.sql

@@ -0,0 +1,2 @@
+-- Your SQL goes here
+CREATE INDEX posts_attention_idx ON posts (n_attentions)

src/cache.rs

@@ -216,6 +216,7 @@ impl PostListCache {
                 1 => -p.last_comment_time.timestamp(),
                 2 => (-p.hot_score).into(),
                 3 => rand::thread_rng().gen_range(0..i64::MAX),
+                4 => (-p.n_attentions).into(),
                 _ => panic!("wrong mode"),
             },
             p.id,

src/models.rs

@@ -256,6 +256,10 @@ impl Post {
                 query = query.filter(posts::is_reported.eq(false));
             }
 
+            if order_mode == 1 {
+                query = query.filter(posts::n_comments.gt(0));
+            }
+
             if let Some(ri) = room_id {
                 query = query.filter(posts::room_id.eq(ri));
             }
@@ -265,6 +269,7 @@ impl Post {
                 1 => query.order(posts::last_comment_time.desc()),
                 2 => query.order(posts::hot_score.desc()),
                 3 => query.order(RANDOM),
+                4 => query.order(posts::n_attentions.desc()),
                 _ => panic!("Wrong order mode!"),
             };
 
@@ -351,7 +356,7 @@ impl Post {
     pub async fn refresh_cache(&self, rconn: &RdsConn, is_new: bool) {
         join!(
             self.set_instance_cache(rconn),
-            future::join_all((if is_new { 0..4 } else { 1..4 }).map(|mode| async move {
+            future::join_all((if is_new { 0..5 } else { 1..5 }).map(|mode| async move {
                 PostListCache::init(None, mode, &rconn.clone())
                     .put(self)
                     .await;

src/schema.rs

@@ -45,4 +45,8 @@ table! {
 
 joinable!(comments -> posts (post_id));
 
-allow_tables_to_appear_in_same_query!(comments, posts, users,);
+allow_tables_to_appear_in_same_query!(
+    comments,
+    posts,
+    users,
+);