Destructuring of the object returned by mongodb query result

user_5364676 0
Viewed 2777

Let's say we start a mongodb query statement as the following:

const user = await db.users.findOne(...);
console.log(user);

The result is good.

{
  _id: 5f60647c28b90939d0e5fb24,
  tenantId: '5e6f7c86e7158b42bf500371',
  username: 'aaaa',
  email: 'xxxx@yy.com',
  createdAt: 2020-09-15T06:51:40.531Z,
  updatedAt: 2020-09-15T06:51:40.531Z,
  __v: 0
}

Then we use destructuring.

const { _id, username, ...others } = user;
console.log(others);

We get a weird thing:

[
  [
    '$__',
    InternalCache {
      strictMode: false,
      selected: [Object],
      shardval: undefined,
      saveError: undefined,
      validationError: undefined,
      adhocPaths: undefined,
      removing: undefined,
      inserting: undefined,
      saving: undefined,
      version: undefined,
      getters: {},
      _id: 5f60647c28b90939d0e5fb24,
      populate: undefined,
      populated: undefined,
      wasPopulated: false,
      scope: undefined,
      activePaths: [StateMachine],
      pathsToScopes: {},
      cachedRequired: {},
      session: undefined,
      '$setCalled': Set(0) {},
      ownerDocument: undefined,
      fullPath: undefined,
      emitter: [EventEmitter],
      '$options': [Object]
    }
  ],
  [ 'isNew', false ],
  [ 'errors', undefined ],
  [ '$locals', {} ],
  [ '$op', null ],
  [
    '_doc',
    {
      _id: 5f60647c28b90939d0e5fb24,
      tenantId: '5e6f7c86e7158b42bf500371',
      username: 'aaaa',
      email: 'xxxx@yyy.com',
      createdAt: 2020-09-15T06:51:40.531Z,
      updatedAt: 2020-09-15T06:51:40.531Z,
      __v: 0
    }
  ],
  [ '$init', true ]
]

What's going on here? And how to make destructuring work again? There is the same error on Object.entries(others). There is one workaround, I can stringify it and then parse it back. But this is obviously redundant.

mongoose node.js mongodb
2 Answers

By default, Mongoose queries return an instance of the Mongoose Document class. That's why you get the weird result after destructuring. In your case, you should use .lean() on your query to get expected result;

user_117113160

this works for me :


const user = UserModel.findOne({...});
const { _id, username, ...others } = user.toObject();
user_145038890
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