cursor.showRecordId()

Definition定义

cursor.showRecordId()

Important

mongosh Method

This page documents a mongosh method. This is not the documentation for a language-specific driver, such as Node.js.

For MongoDB API drivers, refer to the language-specific MongoDB driver documentation.

Appends the $recordId field to documents returned by a query. $recordId is the internal key that uniquely identifies a document in a collection. 将$recordId字段追加到查询返回的文档中$recordId是唯一标识集合中文档的内部键。$recordId format:格式：

'$recordId': Long(<int>)

Returns:返回值：	A modified cursor object that contains the document fields and the appended $recordId field.一个修改过的游标对象，包含文档字段和附加的$recordId字段。

Example实例

The example uses this pizzas collection:该示例使用以下pizzas集合：

db.pizzas.insertMany( [
   { type: "pepperoni", size: "small", price: 4 },
   { type: "cheese", size: "medium", price: 7 },
   { type: "vegan", size: "large", price: 8 }
] )

The following find() example uses showRecordId() to append the $recordId to the pizza document fields in the output:以下find()示例使用showRecordId()将$recordId附加到输出中的pizza文档字段：

db.pizzas.find().showRecordId()

Example output:示例输出：

[
   {
      _id: ObjectId("62ffc70660b33b68e8f30435"),
      type: 'pepperoni',
      size: 'small',
      price: 4,
      '$recordId': Long("1")
   },
   {
      _id: ObjectId("62ffc70660b33b68e8f30436"),
      type: 'cheese',
      size: 'medium',
      price: 7,
      '$recordId': Long("2")
   },
   {
      _id: ObjectId("62ffc70660b33b68e8f30437"),
      type: 'vegan',
      size: 'large',
      price: 8,
      '$recordId': Long("3")
   }
]