Introduce processor

src/server/api/common/get-friends.ts

@@ -0,0 +1,26 @@
+import * as mongodb from 'mongodb';
+import Following from '../models/following';
+
+export default async (me: mongodb.ObjectID, includeMe: boolean = true) => {
+	// Fetch relation to other users who the I follows
+	// SELECT followee
+	const myfollowing = await Following
+		.find({
+			follower_id: me,
+			// 削除されたドキュメントは除く
+			deleted_at: { $exists: false }
+		}, {
+			fields: {
+				followee_id: true
+			}
+		});
+
+	// ID list of other users who the I follows
+	const myfollowingIds = myfollowing.map(follow => follow.followee_id);
+
+	if (includeMe) {
+		myfollowingIds.push(me);
+	}
+
+	return myfollowingIds;
+};