Node.js 用于对mongoDB中具有相同密钥的2个集合中的对象进行深度复制的查询

我试图通过Mongo DB查询对来自2个集合的对象数据进行深度复制

例子： 表1数据：

---

表2数据：

---

所需输出

---

我使用$mergeObjects尝试了下面的查询，结果出现了一个错误

db.Table1.aggregate([{
    $lookup: {
            from: "Table2",
            localField: "type",
            foreignField: "type",
                as: "fromItems"
      }
   },
   {
      $replaceRoot: { newRoot: { $mergeObjects: [ { $arrayElemAt: [ "$fromItems", 0 ] }, "$$ROOT" ] } }
   },
   { $project: { fromItems: 0 } }
])

对于上述查询，产生的错误如下：

```
     assert: command failed: {
        "ok" : 0,
        "errmsg" : "Unrecognized expression '$mergeObjects'",
        "code" : 168,
        "codeName" : "InvalidPipelineOperator"
        } : aggregate failed
        _getErrorWithCode@src/mongo/shell/utils.js:23:13
        doassert@src/mongo/shell/assert.js:13:14
        assert.commandWorked@src/mongo/shell/assert.js:266:5
         DBCollection.prototype.aggregate@src/mongo/shell/collection.js:1215:5
    @(shell):1:1

    Error: command failed: {
        "ok" : 0,
        "errmsg" : "Unrecognized expression '$mergeObjects'",
        "code" : 168,
        "codeName" : "InvalidPipelineOperator"
    } : aggregate failed :
    _getErrorWithCode@src/mongo/shell/utils.js:23:13
    doassert@src/mongo/shell/assert.js:13:14
    assert.commandWorked@src/mongo/shell/assert.js:266:5
    DBCollection.prototype.aggregate@src/mongo/shell/collection.js:1215:5
    @(shell):1:1```

如何在Mongo DB查询中对对象内部的对象进行深度复制

 {
    type:"fruits"
    box1:{
    apple:1,
    orange:2,
    grapes:3,
    watermelon:4
    },
    box2:{
    one:1,
    two:2
    three:3
    }
 }

db.Table1.aggregate([{
    $lookup: {
            from: "Table2",
            localField: "type",
            foreignField: "type",
                as: "fromItems"
      }
   },
   {
      $replaceRoot: { newRoot: { $mergeObjects: [ { $arrayElemAt: [ "$fromItems", 0 ] }, "$$ROOT" ] } }
   },
   { $project: { fromItems: 0 } }
])

```
     assert: command failed: {
        "ok" : 0,
        "errmsg" : "Unrecognized expression '$mergeObjects'",
        "code" : 168,
        "codeName" : "InvalidPipelineOperator"
        } : aggregate failed
        _getErrorWithCode@src/mongo/shell/utils.js:23:13
        doassert@src/mongo/shell/assert.js:13:14
        assert.commandWorked@src/mongo/shell/assert.js:266:5
         DBCollection.prototype.aggregate@src/mongo/shell/collection.js:1215:5
    @(shell):1:1

    Error: command failed: {
        "ok" : 0,
        "errmsg" : "Unrecognized expression '$mergeObjects'",
        "code" : 168,
        "codeName" : "InvalidPipelineOperator"
    } : aggregate failed :
    _getErrorWithCode@src/mongo/shell/utils.js:23:13
    doassert@src/mongo/shell/assert.js:13:14
    assert.commandWorked@src/mongo/shell/assert.js:266:5
    DBCollection.prototype.aggregate@src/mongo/shell/collection.js:1215:5
    @(shell):1:1```