整理した

src/models/post-reaction.ts

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+import * as mongo from 'mongodb';
+import deepcopy = require('deepcopy');
+import db from '../db/mongodb';
+import Reaction from './post-reaction';
+import { pack as packUser } from './user';
+
+const PostReaction = db.get<IPostReaction>('postReactions');
+export default PostReaction;
+
+export interface IPostReaction {
+	_id: mongo.ObjectID;
+	createdAt: Date;
+	deletedAt: Date;
+	postId: mongo.ObjectID;
+	userId: mongo.ObjectID;
+	reaction: string;
+}
+
+/**
+ * Pack a reaction for API response
+ *
+ * @param {any} reaction
+ * @param {any} me?
+ * @return {Promise<any>}
+ */
+export const pack = (
+	reaction: any,
+	me?: any
+) => new Promise<any>(async (resolve, reject) => {
+	let _reaction: any;
+
+	// Populate the reaction if 'reaction' is ID
+	if (mongo.ObjectID.prototype.isPrototypeOf(reaction)) {
+		_reaction = await Reaction.findOne({
+			_id: reaction
+		});
+	} else if (typeof reaction === 'string') {
+		_reaction = await Reaction.findOne({
+			_id: new mongo.ObjectID(reaction)
+		});
+	} else {
+		_reaction = deepcopy(reaction);
+	}
+
+	// Rename _id to id
+	_reaction.id = _reaction._id;
+	delete _reaction._id;
+
+	// Populate user
+	_reaction.user = await packUser(_reaction.userId, me);
+
+	resolve(_reaction);
+});