MongoDB 연결하는 과정에서 오류가 발생합니다.

- error src\app\page.js (6:20) @ db
- error TypeError: client.db is not a function
    at Home (./src/app/page.js:12:23)
    at async Promise.all (index 0)
  4 |
  5 |   const client = connectDB;
> 6 |   const db = client.db("forum");
    |                    ^
  7 |   let a = await db.collection('post').find().toArray();
  8 |   console.log(a)
  9 |
- error src\app\page.js (6:20) @ db
- error TypeError: client.db is not a function
    at Home (./src/app/page.js:12:23)
    at async Promise.all (index 0)
digest: "447737522"
  4 |
  5 |   const client = connectDB;
> 6 |   const db = client.db("forum");
    |                    ^
  7 |   let a = await db.collection('post').find().toArray();
  8 |   console.log(a)