mongodb nested lookup

Gifted Gazelle answered on October 10, 2021 Popularity 9/10 Helpfulness 3/10

answer mongodb nested lookup

mongodb nested lookup

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db.party.aggregate([{
  $lookup: {
    from: "address",
    localField: "_id",
    foreignField: "party_id",
    as: "address"
  }
}, {
  $unwind: {
    path: "$address",
    preserveNullAndEmptyArrays: true
  }
}, {
  $lookup: {
    from: "addressComment",
    localField: "address._id",
    foreignField: "address_id",
    as: "address.addressComment",
  }
}, {
  $group: {
    _id : "$_id",
    name: { $first: "$name" },
    address: { $push: "$address" }
  }
}, {
  $project: {
    _id: 1,
    name: 1,
    address: {
      $filter: { input: "$address", as: "a", cond: { $ifNull: ["$$a._id", false] } }
    } 
  }
}]);

Popularity 9/10 Helpfulness 3/10 Language whatever

Source: stackoverflow.com

Tags: lookup mongodb nested whatever

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Contributed on Oct 10 2021

Gifted Gazelle

0 Answers Avg Quality 2/10

mongodb nested lookup

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