query.js

users = await UserMobile.aggregate([
      {
        $match: query,
      },
      {
        $lookup: { from: 'userpackages', localField: 'userPackage', foreignField: '_id', as: 'userPackage' },
      },
      {
        $lookup: { from: 'dates', localField: '_id', foreignField: 'owner', as: 'activeDate' },
      },
      {
        $lookup: { from: 'dates', localField: '_id', foreignField: 'owner', as: 'dateJoined' },
      },
      {
        $lookup: { from: 'dates', localField: '_id', foreignField: 'accepted.uid', as: 'dateMatch' },
      },
      {
        $lookup: { from: 'log_swipe', localField: '_id', foreignField: 'srcUser', as: 'swipe' },
      },
      {
        $project: {
          introduce: 1,
          gender: 1,
          birthDay: 1,
          displayName: 1,
          photos: 1,
          email: 1,
          createdAt: 1,
          updatedAt: 1,
          location: {
            $cond: {
              if: '$enableCustomLoc',
              then: {
                $cond: {
                  if: '$customLocation.province',
                  then: '$customLocation.province',
                  else: '$customLocation.loc.coordinates',
                },
              },
              else: {
                $cond: {
                  if: '$location.province',
                  then: '$location.province',
                  else: '$location.loc.coordinates',
                },
              },
            },
          },
          userPackage: { $arrayElemAt: ['$userPackage.name', 0] },
          activeDate: { $size: '$activeDate' },
          dateJoined: { $add: [{ $size: '$dateJoined.applicants' }, { $size: '$dateJoined.accepted' }] },
          dateMatch: { $size: '$dateMatch' },
          swipe: { $size: '$swipe' },
          match: { $size: '$matched' },
        },
      },
      { $sort: sort },
      { $skip: cursor },
      { $limit: limit },
    ]);