refactor: DriveFileEntityServiceとDriveFolderEntityServiceの複数件取得をリファクタ (#17064)

* refactor: DriveFileEntityServiceとDriveFolderEntityServiceの複数件取得をリファクタ

* add test

* fix

* Update packages/backend/src/core/entities/DriveFolderEntityService.ts

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update packages/backend/test/unit/entities/DriveFolderEntityService.ts

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update packages/backend/src/core/entities/DriveFileEntityService.ts

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Revert "Update packages/backend/src/core/entities/DriveFileEntityService.ts"

This reverts commit 83bb9564cf.

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

packages/backend/src/misc/split-id-and-objects.ts

@@ -0,0 +1,27 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+/**
+ * idとオブジェクトを分離する
+ * @param input idまたはオブジェクトの配列
+ * @returns idの配列とオブジェクトの配列
+ */
+export function splitIdAndObjects<T extends { id: string }>(input: (T | string)[]): { ids: string[]; objects: T[] } {
+	const ids: string[] = [];
+	const objects : T[] = [];
+
+	for (const item of input) {
+		if (typeof item === 'string') {
+			ids.push(item);
+		} else {
+			objects.push(item);
+		}
+	}
+
+	return {
+		ids,
+		objects,
+	};
+}

packages/backend/src/misc/unique-by-key.ts

@@ -0,0 +1,21 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+/**
+ * itemsの中でkey関数が返す値が重複しないようにした配列を返す
+ * @param items 重複を除去したい配列
+ * @param key 重複判定に使うキーを返す関数
+ * @returns 重複を除去した配列
+ */
+export function uniqueByKey<TItem, TKey = string>(items: Iterable<TItem>, key: (item: TItem) => TKey): TItem[] {
+	const map = new Map<TKey, TItem>();
+	for (const item of items) {
+		const k = key(item);
+		if (!map.has(k)) {
+			map.set(k, item);
+		}
+	}
+	return [...map.values()];
+}