MongoDB collection 2개를 하나의 get 요청으로 못받습니다.

HTML

<div class="container">
<div class="menu">
<p class="title-l">Notey</p>
<nav>
<i class="fas fa-home"></i> 홈
<i class="fas fa-pen-square"></i> 새 노트
<form action="/" method="post">
<button type="submit" class="link" name="<% user.id %>">로그아웃</button>
</form>
</nav>
<footer>
<p class="description"><i class="fab fa-instagram"></i> @choi2j86</p>
<p class="description"><i class="fab fa-github"></i> choi2j</p>
</footer>
</div>

<div class="inside">
<p class="title-m"><%= user.id %><span class="smaller"> 님 안녕하세요!</span> 👋</p>

<p class="title-m">메모</p>

<div class="memo-container">
<% for(let i = 0; i < memo.length; i++) { %>
<div class="memo">
<div class="memo-inside">
<button type="submit" class="memo-btn">edit</button>
<button type="submit" class="memo-btn">del</button>
</div>
<p class="memo-title">asdf</p>
<p class="memo-date">asdf</p>
<p class="memo-content">asdf</p>
</div>
<% } %>
</div>
</div>
</div>

JS
var collectionOne = [];
var collectionTwo = [];

app.get("/home/:_id", (req, res) => {
 db.collection("user", (err, collection) => {
 collection.findOne({ _id: parseInt(req.params._id) }, (err, result) => {
if (err) {
 console.log(err);
} else {
for (let i = 0; i < result.length; i++) {
 collectionOne[i] = result[i];
}
}
});
});
 db.collection("memo", (err, collection) => {
 collection.find({ owner: parseInt(req.params._id) }).toArray((err, result) => {
if (err) {
 console.log(err);
} else {
for (let i = 0; i < result.length; i++) {
 collectionTwo[i] = result[i];
}
}
});
});
 res.render("home.ejs", { user: collectionOne, memo: collectionTwo });
});

위의 코드로 두개의 MongoDB collection 2개를 받는데
MongoInvalidArgumentError: The callback form of this helper has been removed.
라는 에러가 떴습니다.
이걸 해결할 방법이 있을까요