Sharkey/src/api/endpoints/following/create.ts

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/**
* Module dependencies
*/
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import it from 'cafy';
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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
*
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* @param {any} params
* @param {any} user
* @return {Promise<any>}
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*/
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module.exports = (params, user) => new Promise(async (res, rej) => {
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const follower = user;
// Get 'user_id' parameter
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const [userId, userIdErr] = it(params.user_id, 'id!').get();
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if (userIdErr) return rej('invalid user_id param');
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// 自分自身
if (user._id.equals(userId)) {
return rej('followee is yourself');
}
// Get followee
const followee = await User.findOne({
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_id: userId
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}, {
fields: {
data: false,
profile: false
}
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});
if (followee === null) {
return rej('user not found');
}
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// Check if already following
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const exist = await Following.findOne({
follower_id: follower._id,
followee_id: followee._id,
deleted_at: { $exists: false }
});
if (exist !== null) {
return rej('already following');
}
// Create following
await Following.insert({
created_at: new Date(),
follower_id: follower._id,
followee_id: followee._id
});
// Send response
res();
// Increment following count
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User.update(follower._id, {
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$inc: {
following_count: 1
}
});
// Increment followers count
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User.update({ _id: followee._id }, {
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$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');
});