Include relation in mongo query

db.user.aggregate([
    { $project: { "userId": 1, "userKeyEncrypted": 1, "uuid":1, "roles": 1, "passwordHash": 1, "disabled": 1, companyRefs: { $let: { vars: { refParts: { $objectToArray: "$$ROOT.company" }}, in: "$$refParts.v" } } } },
    { $match: { "companyRefs": { $exists: true } } },
    { $project: { "userId": 1, "userKeyEncrypted": 1, "uuid":1, "roles": 1, "passwordHash": 1, "disabled": 1, "companyRef": { $arrayElemAt: [ "$companyRefs", 1 ] } } },
    { $lookup: { from: "company", localField: "companyRef", foreignField: "_id", as: "company_data" } },
    { $project: { "userId": 1, "userKeyEncrypted": 1, "uuid":1, "roles": 1, "passwordHash": 1, "disabled": 1,  "companyUuid": { $arrayElemAt: [ "$company_data.uuid", 0 ] } } }
])

Source: stackoverflow.com

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