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