From 855db0481c3bd3d845f2d1b4be87150e9c45bee2 Mon Sep 17 00:00:00 2001
From: Taesu <166604494+bytaesu@users.noreply.github.com>
Date: Fri, 26 Dec 2025 04:07:22 +0900
Subject: [PATCH] fix: add supportsArrays to memory and mongodb adapters
 (#6984)

---
 .../better-auth/src/adapters/memory-adapter/memory-adapter.ts   | 1 +
 .../better-auth/src/adapters/mongodb-adapter/mongodb-adapter.ts | 1 +
 .../src/context/__snapshots__/create-context.test.ts.snap       | 2 +-
 3 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/packages/better-auth/src/adapters/memory-adapter/memory-adapter.ts b/packages/better-auth/src/adapters/memory-adapter/memory-adapter.ts
index c9d07a65a7..71d6a354fa 100644
--- a/packages/better-auth/src/adapters/memory-adapter/memory-adapter.ts
+++ b/packages/better-auth/src/adapters/memory-adapter/memory-adapter.ts
@@ -26,6 +26,7 @@ export const memoryAdapter = (
 			adapterName: "Memory Adapter",
 			usePlural: false,
 			debugLogs: config?.debugLogs || false,
+			supportsArrays: true,
 			customTransformInput(props) {
 				const useNumberId =
 					props.options.advanced?.database?.useNumberId ||
diff --git a/packages/better-auth/src/adapters/mongodb-adapter/mongodb-adapter.ts b/packages/better-auth/src/adapters/mongodb-adapter/mongodb-adapter.ts
index f3f2053c18..e05c4d348a 100644
--- a/packages/better-auth/src/adapters/mongodb-adapter/mongodb-adapter.ts
+++ b/packages/better-auth/src/adapters/mongodb-adapter/mongodb-adapter.ts
@@ -560,6 +560,7 @@ export const mongodbAdapter = (
 			mapKeysTransformOutput: {
 				_id: "id",
 			},
+			supportsArrays: true,
 			supportsNumericIds: false,
 			transaction:
 				config?.client && (config?.transaction ?? true)
diff --git a/packages/better-auth/src/context/__snapshots__/create-context.test.ts.snap b/packages/better-auth/src/context/__snapshots__/create-context.test.ts.snap
index 6cf9f16a96..964b661d94 100644
--- a/packages/better-auth/src/context/__snapshots__/create-context.test.ts.snap
+++ b/packages/better-auth/src/context/__snapshots__/create-context.test.ts.snap
@@ -20,7 +20,7 @@ exports[`base context creation > should match config 1`] = `
         "disableTransformInput": false,
         "disableTransformJoin": false,
         "disableTransformOutput": false,
-        "supportsArrays": false,
+        "supportsArrays": true,
         "supportsBooleans": true,
         "supportsDates": true,
         "supportsJSON": false,