如何从mongoose文档中删除指定的字段？ [英] How can i remove a specified field from a mongoose document?

问题描述

我想从猫鼬文档中动态删除一个字段/



我尝试过：



我正在使用

 $ unset 

当我输入值

cars.BMW
 {$ unset：{  cars。 +品牌：  }} 
但加号是意外的。 
 
我们非常感谢您的帮助！
解决方案
 
 unset 

当我输入值

cars.BMW

它有效。但是，当我想传递一个参数，这将是一个汽车品牌然后取消它。我试过

 {
 
 
 unset：{ 汽车。 +品牌： }} 

但是加号是意外的。

我们非常感谢您的帮助！

I would like to remove dynamically a field from a mongoose document/

What I have tried:

I am using

$unset

and when I type the value

"cars.BMW"

it works. But when I want to pass a parameter, which will be a car brand and then to unset it. I tried

{$unset: {"cars."+brand: " "}}

but the plus sign is unexpected.
Your help will be much appreciated!

解决方案

unset

and when I type the value

"cars.BMW"

it works. But when I want to pass a parameter, which will be a car brand and then to unset it. I tried

{

unset: {"cars."+brand: " "}}

but the plus sign is unexpected.
Your help will be much appreciated!

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