added endpoints for retreiving info about items

src/services/product.js

@@ -51,6 +51,12 @@ class ProductService {
         if (!result) return false;
         return true;
     }
+
+    async getByLocalId(groupId, localId) {
+        let result = (await db.query("SELECT * FROM products WHERE group_id = $1 AND local_id = $2", [groupId, localId]));
+        if (result.rowCount == 0) throw new customError(`getByLocalId product not found`, responseCodes.responses.products.not_found);
+        return responseCodes.rows[0];
+    }
 };
 
 export default new ProductService();