整理した

src/models/othello-matching.ts

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+import * as mongo from 'mongodb';
+import deepcopy = require('deepcopy');
+import db from '../db/mongodb';
+import { IUser, pack as packUser } from './user';
+
+const Matching = db.get<IMatching>('othelloMatchings');
+export default Matching;
+
+export interface IMatching {
+	_id: mongo.ObjectID;
+	createdAt: Date;
+	parentId: mongo.ObjectID;
+	childId: mongo.ObjectID;
+}
+
+/**
+ * Pack an othello matching for API response
+ */
+export const pack = (
+	matching: any,
+	me?: string | mongo.ObjectID | IUser
+) => new Promise<any>(async (resolve, reject) => {
+
+	// Me
+	const meId: mongo.ObjectID = me
+		? mongo.ObjectID.prototype.isPrototypeOf(me)
+			? me as mongo.ObjectID
+			: typeof me === 'string'
+				? new mongo.ObjectID(me)
+				: (me as IUser)._id
+		: null;
+
+	const _matching = deepcopy(matching);
+
+	// Rename _id to id
+	_matching.id = _matching._id;
+	delete _matching._id;
+
+	// Populate user
+	_matching.parent = await packUser(_matching.parentId, meId);
+	_matching.child = await packUser(_matching.childId, meId);
+
+	resolve(_matching);
+});