Question

实际上，我想更新我的文档数组中具有viewProfile : true的特定对象，但是它将更新数组中的所有元素这是我的查询：

const user = await User.updateMany(
    {
      _id: req.userData.id,
      "notifications.viewProfile" : true
    },
    {
      $set: {
        "notifications.$[].read": false
      }
    }
  );

考虑本文档

/* 1 */
{
    "_id" : ObjectId("5e4ae76bd4e24418a020b665"),
    "username" : "test",
    "notifications" : [ 
        {
            "createdAt" : ISODate("2020-02-18T19:22:24.809Z"),
            "_id" : ObjectId("5e4c397075265a36203dab5a"),
            "message" : "testone is now following you.",
            "viewProfile" : false,
            "read" : false
        }, 
        {
            "createdAt" : ISODate("2020-02-18T19:22:29.200Z"),
            "_id" : ObjectId("5e4c397575265a36203dab5d"),
            "message" : "testone is now following you.",
            "viewProfile" : true,
            "read" : false
        }
    ],
}

Answer 1

使用过滤后的位置运算符$[<identifier>]。参考https://docs.mongodb.com/manual/reference/operator/update/positional-filtered/

const user = await User.update(
   {
      _id: req.userData.id
   },
   { $set: {  "notifications.$[element].read": false } },
   { 
     multi: true,
     arrayFilters: [ { "element.viewProfile": true } ]
   }
)

如何更新符合条件的数组中的特定对象

1 个答案: