87 lines
1.7 KiB
JavaScript
87 lines
1.7 KiB
JavaScript
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'use strict';
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/**
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* Module dependencies
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*/
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import * as mongo from 'mongodb';
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import User from '../../models/user';
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import Following from '../../models/following';
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import notify from '../../common/notify';
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import event from '../../event';
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import serializeUser from '../../serializers/user';
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/**
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* Follow a user
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*
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* @param {Object} params
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* @param {Object} user
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* @return {Promise<object>}
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*/
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module.exports = (params, user) =>
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new Promise(async (res, rej) =>
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{
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const follower = user;
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// Get 'user_id' parameter
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let userId = params.user_id;
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if (userId === undefined || userId === null) {
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return rej('user_id is required');
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}
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// 自分自身
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if (user._id.equals(userId)) {
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return rej('followee is yourself');
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}
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// Get followee
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const followee = await User.findOne({
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_id: new mongo.ObjectID(userId)
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});
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if (followee === null) {
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return rej('user not found');
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}
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// Check arleady following
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const exist = await Following.findOne({
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follower_id: follower._id,
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followee_id: followee._id,
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deleted_at: { $exists: false }
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});
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if (exist !== null) {
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return rej('already following');
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}
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// Create following
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await Following.insert({
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created_at: new Date(),
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follower_id: follower._id,
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followee_id: followee._id
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});
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// Send response
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res();
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// Increment following count
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User.updateOne({ _id: follower._id }, {
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$inc: {
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following_count: 1
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}
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});
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// Increment followers count
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User.updateOne({ _id: followee._id }, {
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$inc: {
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followers_count: 1
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}
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});
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// Publish follow event
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event(follower._id, 'follow', await serializeUser(followee, follower));
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event(followee._id, 'followed', await serializeUser(follower, followee));
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// Notify
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notify(followee._id, follower._id, 'follow');
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});
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