fix closure table saves on item creation

src/items/items.service.ts

@@ -44,34 +44,33 @@ export class ItemsService {
   }
 
   async createItem(input: NewItemInput): Promise<Item> {
+    // must use Repository.save() for the closure table to work,
+    // so we have to check whether the provided ID exists in the first place
+    if (input.id && (await this.itemRepository.count({ id: input.id })) !== 0) {
+      throw new Error('Item with this ID already exists');
+    }
+
+    const highestId = input.id
+      ? // nobody cares in this case
+        null
+      : (
+          await this.itemRepository.findOne({
+            select: ['id'],
+            order: { id: 'DESC' },
+          })
+        )?.id || '139999999999';
+
     const item = this.itemRepository.create({
       ...input,
-      id: input.id || undefined,
+      // if id not provided, use the highest one in db +1
+      id: highestId ? (BigInt(highestId) + 1n).toString(10) : input.id,
       parent: input.parent
         ? await this.itemRepository.findOneOrFail(input.parent)
         : undefined,
     });
 
-    const highestIdQuery = this.itemRepository
-      .createQueryBuilder()
-      .select('id')
-      .orderBy('id', 'DESC')
-      .limit(1);
+    await this.itemRepository.save(item);
 
-    const insert = await this.itemRepository
-      .createQueryBuilder()
-      .insert()
-      .into(Item)
-      .values({
-        ...item,
-        // if id is specified, use it.
-        // if not, get the highest id in table and use highest_id+1
-        id: input.id || (() => `((${highestIdQuery.getSql()}) + 1)`),
-      })
-      .returning(['id'])
-      .execute();
-
-    item.id = insert.identifiers[0].id || item.id;
     return item;
   }
 }

tsconfig.json

@@ -5,7 +5,7 @@
 
     /* Basic Options */
     "incremental": true /* Enable incremental compilation */,
-    "target": "es2017" /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019', 'ES2020', 'ES2021', or 'ESNEXT'. */,
+    "target": "es2020" /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019', 'ES2020', 'ES2021', or 'ESNEXT'. */,
     "module": "commonjs" /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', 'es2020', or 'ESNext'. */,
     // "lib": [],                                   /* Specify library files to be included in the compilation. */
     // "allowJs": true,                             /* Allow javascript files to be compiled. */