在 MongoDB 中，如何在文档中更新 Object 中的数组

Question

我的文档在 MongoDB 中如下所示：

  {
    "_id": {
        "$oid": "6099d057b769cc513025fd54"
    },
    "key_name": "I_CAN_MATCH",
    "object_1": {
        "sub_object_array_1": [{
            "a": "TZNNI",
            "b": "R"
        }],
        "sub_object_array_2": [{
            "c": "SDLYA",
            "d": "N"
        }, {
            "c": "KTSMQ",
            "d": "N"
        }],
        "sub_object_array_3": [{
            "e": "KYCT0",
            "f": "F"
        }, {
            "e": "KYCT1",
            "f": "N"
        }, {
            "e": "KYCT2",
            "f": "F"
        }, {
            "e": "KYCT3",
            "f": "E"
        }],
    },
    "object_2": {
      "sub_object_4": { "and": "so on ..." }
    },
    "object_array_1": [{
            "g": "KYCT0",
            "h": "F"
        }, {
            "g": "KYCT1",
            "h": "N"
        }, {
            "g": "KYCT2",
            "h": "F"
        }, {
            "g": "KYCT3",
            "h": "E"
        }]
  }

我的问题是如何更新数组sub_object_array_3其中f = "F" 到f = "U"？

以下对我不起作用：

  await db_model.updateMany( 
    { key_name: "I_CAN_MATCH" },
    { $set: { "object_1.sub_object_array_3.$[array_element].f": "U" } },
    { arrayFilters: [ { "array_element.f": "F" } ] } );

但以下是。 所以我理解语法在这种情况下是如何工作的。

  await db_model.updateMany( 
    { key_name: "I_CAN_MATCH" },
    { $set: { "object_array_1.$[array_element].h": "U" } },
    { arrayFilters: [ { "array_element.h": "F" } ] } );

当数组首先位于 Object 内时，我只是不知道我在$set命令中缺少什么。

我已经搜索过了，但是我使用的每个搜索词都指向 arrays 中的 arrays，这里不是这种情况。 有人可以帮助我吗？

提前致谢！

Answer 1

错误- https://mongoplayground.net/p/Cvfc6oNyhrH

fail to run update: multiple write errors: [{write errors: [{Error parsing array filter :: caused by :: The top-level field name must be an alphanumeric string beginning with a lowercase letter, found 'array_element'}]}, {<nil>}]

---

解决方案：-

将array_element更改为arrayElement或不带_的任何内容

注意：- 它应该是alphanumeric

https://docs.mongodb.com/manual/reference/operator/update/positional-filtered/

必须以小写字母开头并且仅包含字母数字字符。

---

演示 - https://mongoplayground.net/p/GJku1bFaj3m

db.collection.update({
  key_name: "I_CAN_MATCH"
},
{
  $set: {
    "object_1.sub_object_array_3.$[arrayElement].f": "U"
  }
},
{
  arrayFilters: [
    { "arrayElement.f": "F" }
  ]
})