Show children in item class details

src/frontend/item_class.rs

@@ -27,19 +27,25 @@ async fn show_item_class(
 ) -> actix_web::Result<impl Responder> {
     let id = path.into_inner();
 
-    let item_class = manage::item_class::get(&mut pool.clone().get().await.unwrap(), id)
+    let mut conn = pool.clone().get().await.unwrap();
+
+    let item_class = manage::item_class::get(&mut conn, id)
         .await
         .map_err(error::ErrorInternalServerError)?;
 
     // TODO: Once async closures are stable, use map_or on item_class.parent instead
     let parent = match item_class.parent {
-        Some(id) => manage::item_class::get(&mut pool.get().await.unwrap(), id)
+        Some(id) => manage::item_class::get(&mut conn, id)
             .await
             .map(Some)
             .map_err(error::ErrorInternalServerError)?,
         None => None,
     };
 
+    let children = manage::item_class::children(&mut conn, id)
+        .await
+        .map_err(error::ErrorInternalServerError)?;
+
     let mut title = item_class.name.clone();
     title.push_str(" – Item Details");
 
@@ -73,6 +79,18 @@ async fn show_item_class(
                     }
                 }
             }
+
+            @if !children.is_empty() {
+                h3 .mt-4 { "Children" }
+
+                ul {
+                    @for child in children {
+                        li {
+                            a href={ "/item-class/" (child.id) } { (child.name) }
+                        }
+                    }
+                }
+            }
         },
     ))
 }

src/manage/item_class.rs

@@ -83,3 +83,14 @@ pub async fn delete(conn: &mut AsyncPgConnection, id: Uuid) -> Result<(), diesel
     assert_eq!(num_deleted, 1);
     Ok(())
 }
+
+pub async fn children(
+    conn: &mut AsyncPgConnection,
+    id: Uuid,
+) -> Result<Vec<ItemClass>, diesel::result::Error> {
+    schema::item_classes::table
+        .filter(schema::item_classes::parent.eq(id))
+        .select(ItemClass::as_select())
+        .load(conn)
+        .await
+}