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/**
* Module dependencies
*/
import $ from 'cafy';
import User from '../../models/user';
import Following from '../../models/following';
import { pack } from '../../models/user';
import getFriends from '../../common/get-friends';
/**
* Get followers of a user
*
* @param {any} params
* @param {any} me
* @return {Promise<any>}
*/
module.exports = (params, me) => new Promise(async (res, rej) => {
// Get 'user_id' parameter
const [userId, userIdErr] = $(params.user_id).id().$;
if (userIdErr) return rej('invalid user_id param');
// Get 'iknow' parameter
const [iknow = false, iknowErr] = $(params.iknow).optional.boolean().$;
if (iknowErr) return rej('invalid iknow param');
// Get 'limit' parameter
const [limit = 10, limitErr] = $(params.limit).optional.number().range(1, 100).$;
if (limitErr) return rej('invalid limit param');
// Get 'cursor' parameter
const [cursor = null, cursorErr] = $(params.cursor).optional.id().$;
if (cursorErr) return rej('invalid cursor param');
// Lookup user
const user = await User.findOne({
_id: userId
}, {
fields: {
_id: true
}
});
if (user === null) {
return rej('user not found');
}
// Construct query
const query = {
followee_id: user._id,
deleted_at: { $exists: false }
} as any;
// ログインしていてかつ iknow フラグがあるとき
if (me && iknow) {
// Get my friends
const myFriends = await getFriends(me._id);
query.follower_id = {
$in: myFriends
};
}
// カーソルが指定されている場合
if (cursor) {
query._id = {
$lt: cursor
};
}
// Get followers
const following = await Following
.find(query, {
limit: limit + 1,
sort: { _id: -1 }
});
// 「次のページ」があるかどうか
const inStock = following.length === limit + 1;
if (inStock) {
following.pop();
}
// Serialize
const users = await Promise.all(following.map(async f =>
await pack(f.follower_id, me, { detail: true })));
// Response
res({
users: users,
next: inStock ? following[following.length - 1]._id : null,
});
});
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