如何在mongodb中从对象数组中获取公共属性

db.collection.aggregate([
  { $unwind: "$objectArrayField" },
  {
    $group: {
      _id: null,
      commonProperty: { $addToSet: "$objectArrayField.commonProperty" }
    }
  },
  { $unwind: "$commonProperty" },
  {
    $group: {
      _id: null,
      commonProperty: { $addToSet: "$commonProperty" }
    }
  },
  { $project: { _id: 0, commonProperty: 1 } }
])