const data = await this.notifModel.aggregate([
      { $match: { author: id } },
      {
        $lookup: {
          from: 'users',
          localField: 'notifications.author',
          foreignField: 'id',
          as: 'users',
          pipeline: [{ $project: { _id: 0, __v: 0, password: 0, email: 0 } }],
        },
      },
      {
        $project: {
          notifications: {
            $map: {
              input: '$notifications',
              as: 'c',
              in: {
                $mergeObjects: [
                  '$$c',
                  {
                    $arrayElemAt: [
                      {
                        $filter: {
                          input: '$users',
                          cond: {
                            $eq: ['$$c.notifications.author', '$$this._id'],
                          },
                        },
                      },
                      0,
                    ],
                  },
                ],
              },
            },
          },
        },
      },
    ]);