From a81a5f50b3d7d9e161766acf7c5539f53dbc5567 Mon Sep 17 00:00:00 2001
From: "Xunnamius (Romulus)" <Xunnamius@users.noreply.github.com>
Date: Thu, 26 Aug 2021 15:52:03 -0700
Subject: [PATCH] fix(src): protect against bad key-exclusion issue

---
 src/backend/db.ts | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/backend/db.ts b/src/backend/db.ts
index 00079b2..b520c93 100644
--- a/src/backend/db.ts
+++ b/src/backend/db.ts
@@ -134,10 +134,16 @@ export async function itemExists<T>(
     }
   }
 
+  if (key == '_id' && options?.exclude_id) {
+    throw new GuruMeditationError(
+      'assert failed: cannot use "_id" as key and use exclude_id simultaneously'
+    );
+  }
+
   const result = collection.find({
     [key]: id,
     ...(options?.exclude_id ? { _id: { $ne: options.exclude_id } } : {})
-  });
+  } as unknown as Parameters<typeof collection.find>[0]);
 
   if (options?.caseInsensitive) {
     result.collation({ locale: 'en', strength: 2 });