clean ui for logbook

src/model/logbook.rs

@@ -182,6 +182,21 @@ impl Logbook {
         Ok(())
     }
 
+    pub async fn distances(db: &SqlitePool) -> Vec<(String, i64)>{
+        let result = sqlx::query!("SELECT destination, distance_in_km FROM logbook WHERE id IN (SELECT MIN(id) FROM logbook GROUP BY destination) AND destination IS NOT NULL AND distance_in_km IS NOT NULL;")
+        .fetch_all(db)
+        .await
+        .unwrap();
+
+    result.into_iter().filter_map(|r| {
+        if let (Some(destination), Some(distance_in_km)) = (r.destination, r.distance_in_km) {
+            Some((destination, distance_in_km))
+        } else {
+            None
+        }
+    }).collect()
+    }
+
     async fn remove_rowers(&self, db: &mut Transaction<'_, Sqlite>) {
         sqlx::query!("DELETE FROM rower WHERE logbook_id=?", self.id)
             .execute(db)