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/**
* Module dependencies
*/
import $ from 'cafy';
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 {any} params
* @param {any} user
* @return {Promise<any>}
*/
module.exports = (params, user) => new Promise(async (res, rej) => {
const follower = user;
// Get 'user_id' parameter
const [userId, userIdErr] = $(params.user_id).id().$;
if (userIdErr) return rej('invalid user_id param');
// 自分自身
if (user._id.equals(userId)) {
return rej('followee is yourself');
}
// Get followee
const followee = await User.findOne({
_id: 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');
});
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