通过 MongoDB 文档中的索引更新多个数组元素

Question

我正在尝试更新特定文档中数组中的多个元素，其中我有需要更新的元素的索引。

MongoDB Playground Link

假设我有一个文件：

{
    "key": 1,
    "questions": [
      {
        "text": "first",
      },
      {
        "text": "second",
      },
      {
        "text": "third",
        "answered": "balloon",
      },
    ],
},

我想更新问题 2 和 3（按索引号）并在项目中添加键、值对。
预期输出：

{
    "key": 1,
    "questions": [
      {
        "text": "first",
      },
      {
        "text": "second",
        "answered": "second answer", //Added field
      },
      {
        "text": "third",
        "answered": "third answer", //Updated field
      },
    ],
},

到目前为止我所尝试的：

db.collection.update({
  "key": 1,
},
{
  $set: {
    "questions.$[elem0].answered": "second answer",
    "questions.$[elem1].answered": "third answer",
  }
},
{
  arrayFilters: [
    {
      "elem0": 1 //Trying to update index position 1
    },
    {
      "elem1": 2 //Trying to update index position 2
    }
  ],
})

我希望操作是原子的，而不是对我正在更新的每个项目进行多个查询。所有项都属于同一个文档的嵌套数组。

Answer 1

$set

db.collection.update({
  "key": 1
},
{
  $set: {
    "questions.1.answered": "second answer",
    "questions.2.answered": "third answer"
  }
})

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