Day 18 sqlx files + fixed query

.sqlx/query-1c9e1cc1e5326aca618ac1093c97eb9d50290537c93baa76a70285559b96e351.json

@@ -0,0 +1,26 @@
+{
+  "db_name": "PostgreSQL",
+  "query": "select name as \"region!\", sum(quantity) as \"total!\"\n        from orders join regions on orders.region_id = regions.id\n        group by name order by name",
+  "describe": {
+    "columns": [
+      {
+        "ordinal": 0,
+        "name": "region!",
+        "type_info": "Varchar"
+      },
+      {
+        "ordinal": 1,
+        "name": "total!",
+        "type_info": "Int8"
+      }
+    ],
+    "parameters": {
+      "Left": []
+    },
+    "nullable": [
+      true,
+      null
+    ]
+  },
+  "hash": "1c9e1cc1e5326aca618ac1093c97eb9d50290537c93baa76a70285559b96e351"
+}

.sqlx/query-2a21722026139ab89b4f8131d12d47b1da5471d984bd015ece9051dfaccd0eaa.json

@@ -0,0 +1,15 @@
+{
+  "db_name": "PostgreSQL",
+  "query": "insert into regions values ($1, $2)",
+  "describe": {
+    "columns": [],
+    "parameters": {
+      "Left": [
+        "Int4",
+        "Varchar"
+      ]
+    },
+    "nullable": []
+  },
+  "hash": "2a21722026139ab89b4f8131d12d47b1da5471d984bd015ece9051dfaccd0eaa"
+}

.sqlx/query-37b00daca64bf079e94b5d091990c4ad3e3eef03e850641d4d4de956b1f076ae.json

@@ -0,0 +1,12 @@
+{
+  "db_name": "PostgreSQL",
+  "query": "drop table if exists regions",
+  "describe": {
+    "columns": [],
+    "parameters": {
+      "Left": []
+    },
+    "nullable": []
+  },
+  "hash": "37b00daca64bf079e94b5d091990c4ad3e3eef03e850641d4d4de956b1f076ae"
+}

.sqlx/query-a85986b4dd4eb8c6e86b01ad38d0b9558d5519d218ee25a6a3bb64d0c6f49c61.json

@@ -0,0 +1,12 @@
+{
+  "db_name": "PostgreSQL",
+  "query": "create table orders (\n            id INT PRIMARY KEY,\n            region_id INT,\n            gift_name VARCHAR(50),\n            quantity INT\n        )",
+  "describe": {
+    "columns": [],
+    "parameters": {
+      "Left": []
+    },
+    "nullable": []
+  },
+  "hash": "a85986b4dd4eb8c6e86b01ad38d0b9558d5519d218ee25a6a3bb64d0c6f49c61"
+}

.sqlx/query-bdd47285c5aec94ebd89c91f2ba2b82c1f2f8f78665f4fce65daa4ad7d2b1e0e.json

@@ -0,0 +1,12 @@
+{
+  "db_name": "PostgreSQL",
+  "query": "create table regions (\n            id INT PRIMARY KEY,\n            name VARCHAR(50)\n        )",
+  "describe": {
+    "columns": [],
+    "parameters": {
+      "Left": []
+    },
+    "nullable": []
+  },
+  "hash": "bdd47285c5aec94ebd89c91f2ba2b82c1f2f8f78665f4fce65daa4ad7d2b1e0e"
+}

.sqlx/query-fa0b25c2c2e00f619c9bbdeed70e090e1a6e3aee1bd438d2cda81332af564a9d.json

@@ -0,0 +1,28 @@
+{
+  "db_name": "PostgreSQL",
+  "query": "select r.name as \"region!\", (array_remove(array_agg(o.g), null))[1:$1] as \"top_gifts!\" from regions as r left join lateral (select gift_name as g, region_id as r from orders group by r, g order by sum(quantity) desc, g) as o on r.id = o.r group by r.name order by r.name",
+  "describe": {
+    "columns": [
+      {
+        "ordinal": 0,
+        "name": "region!",
+        "type_info": "Varchar"
+      },
+      {
+        "ordinal": 1,
+        "name": "top_gifts!",
+        "type_info": "VarcharArray"
+      }
+    ],
+    "parameters": {
+      "Left": [
+        "Int4"
+      ]
+    },
+    "nullable": [
+      true,
+      null
+    ]
+  },
+  "hash": "fa0b25c2c2e00f619c9bbdeed70e090e1a6e3aee1bd438d2cda81332af564a9d"
+}

src/cal/day18.rs

@@ -125,43 +125,32 @@ async fn total(State(state): State<Day18State>) -> Result<impl IntoResponse, (St
 }
 
 #[derive(serde::Serialize)]
-struct TopGifts {
+struct TopList {
     region: String,
     top_gifts: Vec<String>,
 }
 
 async fn top_list(
-    Path(limit): Path<i64>,
+    Path(limit): Path<i32>,
     State(state): State<Day18State>,
-) -> Result<Json<Vec<TopGifts>>, (StatusCode, String)> {
-    let mut top_list = vec![];
-
-    let regions = sqlx::query_as!(
-        Region,
-        "select id, name as \"name!\" from regions order by name"
+) -> Result<Json<Vec<TopList>>, (StatusCode, String)> {
+    let top_lists = sqlx::query_as!(
+        TopList,
+        "select r.name as \"region!\", (array_remove(array_agg(o.g), null))[1:$1] as \"top_gifts!\" \
+        from regions as r \
+        left join lateral (\
+            select gift_name as g, region_id as r \
+            from orders \
+            group by r, g \
+            order by sum(quantity) desc, g) as o \
+        on r.id = o.r \
+        group by r.name \
+        order by r.name",
+        limit
     )
     .fetch_all(&state.pool)
     .await
     .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, e.to_string()))?;
 
-    for region in regions {
-        let top_gifts = sqlx::query!(
-            "select gift_name as \"gift_name!\" from orders where region_id = $1 group by gift_name order by sum(quantity) desc limit $2",
-            region.id,
-            limit
-        )
-        .fetch_all(&state.pool)
-        .await
-        .map_err(|e| (StatusCode::INTERNAL_SERVER_ERROR, e.to_string()))?
-        .into_iter()
-        .map(|r| r.gift_name)
-        .collect();
-
-        top_list.push(TopGifts {
-            region: region.name,
-            top_gifts,
-        });
-    }
-
-    Ok(Json(top_list))
+    Ok(Json(top_lists))
 }