使用聚合和查找mongodb从对象数组中获取最小值

db.collection.aggregate([
  { $unwind: "$arrayField" }
])

db.collection.aggregate([
  { $unwind: "$arrayField" },
  { $group: {
      _id: null,
      minValue: { $min: "$arrayField.valueField" }
  }}
])

db.collection.aggregate([
  { $unwind: "$arrayField" },
  { $group: {
      _id: null,
      minValue: { $min: "$arrayField.valueField" }
  }},
  { $project: {
      _id: 0,
      minValue: 1
  }}
])