MongoDB aggregate query with lookup and unwind

query.js

        const items = await Item.aggregate([
          {
            $project: {
              body: 0,
            },
          },
          {
            $lookup: {
              from: 'users',
              localField: 'uid',
              foreignField: '_id',
              as: 'user',
            },
          },
          { $unwind: '$user' },
        ]).toArray()