List of accepted friends

myFriends.js

const query = [
    {
      $lookup: {
        from: 'friends',
        localField: '_id',
        foreignField: 'userId',
        as: 'friends',
      },
    },
    {
      $project: {
        _id: 1,
        name: 1,
        email: 1,
        isFriend: {
          $cond: {
            if: {
              $in: [ObjectId(userId), '$friends.friendId'],
            },
            then: true,
            else: false,
          },
        },
      },
    },
  ];

  try {
    const users = await User.aggregate(query);

    return users;
  } catch (error) {
    throw error;
  }