我试图用nestjs在mongoose中获取一个记录列表，问题是当_id返回的记录是空对象时。下面是我的代码：

const filters: any = {};
    if (typeof dto.searchTerm == 'string') {
      filters['username'] = { $regex: dto.searchTerm, $options: 'i' };
    }
    if (Object.values(UserRole).includes(dto.filterByUserRole)) {
      filters['role'] = dto.filterByUserRole;
    }
    const users = await this.userModel
      .find(filters, 'username email role bio createdAt updatedAt image')
      .limit(dto.size)
      .skip(dto.offset)
      .lean()
      .exec();

    const usersCount = await this.userModel.find(filters).count();
    return { content: users as any, count: usersCount };

我希望返回的数据是这样的：

{
    "content": [
        {
            "_id": "6416ea08b1019420467b3f20",
            ...the other field
        },
    ],
    "count": 1
}

但我得到了这样的回应

{
    "content": [
        {
            "_id": {},
            ...the other data
        },
    "count": 1
}

如何解决此问题？