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mongodb aggregate lookup array of objects

Bored Butterfly on Aug 29, 2020

db.getCollection('widgets').aggregate([
    { $unwind: '$info' },
    {
        $lookup: {
            from: 'icons',
            localField: 'info.iconId',
            foreignField: '_id',
            as: 'info.icon'
        }
    },
    { $unwind: '$info.icon' },
    {
        $group: {
            _id: '$_id',
            root: { $mergeObjects: '$$ROOT' },
            info: { $push: '$info' }
        }
    },
    {
        $replaceRoot: {
            newRoot: {
                $mergeObjects: ['$root', '$$ROOT']
            }
        }
    },
    {
        $project: {
            root: 0
        }
    }
]);

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"mongodb aggregate lookup array of objects" Code Answer's