如何更新一个MongoDB文档的_id? [英] How update the _id of one MongoDB Document?

问题描述

我想更新一个文档的_id字段.我知道这不是一个很好的实践.但是由于某些技术原因，我需要对其进行更新.如果我尝试更新它，则会得到:

I want update an _id field of one document. I know it's not a really good pratice. But with some technical reason, I need update it. If I try to update it I get:

> db.clients.update({ _id: ObjectId("123")}, { $set: { _id: ObjectId("456")}})

Performing an update on the path '_id' would modify the immutable field '_id'

并且不进行更新.我该如何更新?

And the update is not made. How I can update it?

推荐答案

您无法更新它.您必须使用新的_id保存文档，然后删除旧文档.

You cannot update it. You'll have to save the document using a new _id, and then remove the old document.

// store the document in a variable
doc = db.clients.findOne({_id: ObjectId("4cc45467c55f4d2d2a000002")})

// set a new _id on the document
doc._id = ObjectId("4c8a331bda76c559ef000004")

// insert the document, using the new _id
db.clients.insert(doc)

// remove the document with the old _id
db.clients.remove({_id: ObjectId("4cc45467c55f4d2d2a000002")})

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