MongoDB 检查键值是否存在，只更新部分字段

Question

假设我有一个 MongoDB 集合“people”，其形式为

[
  {
    _id: [OBJECT_ID_1],
    name: "Paul",
    hobby: "rowing",
    fixed: 1
  },
  {
    _id: [OBJECT_ID_2],
    name: "Selena",
    hobby: "drawing",
    fixed: 2
  },
  {
    _id: [OBJECT_ID_3],
    name: "Emily",
    hobby: "jogging",
    fixed: 3
  }
]

以及要插入表格的新数据

var data = [
  {
    name: "Paul", // name exists, so keep "fixed" at 1
    hobby: "archery",
    fixed: 4
  },
  {
    name: "Peter",
    hobby: "knitting",
    fixed: 5
  }
]

我想insert/update收集新数据。但是，如果已经存在具有相同“名称”的文档，我不想更新“固定”。插入以上数据后的结果应该是

[
  {
    _id: [OBJECT_ID_1],
    name: "Paul",
    hobby: "archery", // updated
    fixed: 1 // not updated, because name existed
  },
  {
    _id: [OBJECT_ID_2],
    name: "Selena",
    hobby: "drawing",
    fixed: 2
  },
  {
    _id: [OBJECT_ID_3],
    name: "Emily",
    hobby: "jogging",
    fixed: 3
  },
  { // newly inserted document
    _id: [OBJECT_ID_4],
    name: "Peter",
    hobby: "knitting",
    fixed: 5
  }
]

数据包含大量文档，所以如果可能的话，我想在一次查询中实现。实现这一目标的最佳方法是什么？非常感谢！

Answer 1

bulkWrite with updateOne's with $upsert:true 似乎最适合你...

Answer 2

bulkWrite 不执行查找操作。它（在我的例子中）对于控制它是否会创建另一个文档是必要的。就我而言，我只是在 insert/create 方法之前使用查找检查。

if (collection.find({"descr":descr}).limit(1).length === 1) {
 //...create method
  console.log('Exists')
   }

MongoDB 检查键值是否存在，只更新部分字段

MongoDB check if key value exists and update only some fields

database

indexing

crud

mongodb

nosql