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在 ZCCADCDEDB567ABAE643E15DCF0974E503Z 中，我将使用 .pre() 中间件 function 做什么？

[英]In Mongoose, what would I use .pre() middleware function for?

原文 2021-12-09 00:05:45 1 1 javascript/ mongodb/ express/ mongoose

I am just wondering what mongoose.pre('validate') and.pre('save') would be used for.我只是想知道 mongoose.pre('validate') 和.pre('save') 将用于什么。 I know how it works and what it does, but I am not sure what situation I could have that I would use it for.我知道它是如何工作的以及它做了什么，但我不确定我会在什么情况下使用它。 Couldn't I just do everything I need within code?我不能在代码中做我需要的一切吗？ And what is difference between validate and save?验证和保存有什么区别？

Sorry if these are dumb questions, I've done my research but not sure when to use these features对不起，如果这些是愚蠢的问题，我已经完成了我的研究，但不确定何时使用这些功能

1 个解决方案

We use the.pre() function that is executed before or after a certain action that you specify.我们使用在您指定的某个操作之前或之后执行的.pre() function。 When you want to run a function every time before you save a document in the DB, we would you a pre-hook for that.如果您想在每次将文档保存到数据库之前运行 function，我们会为您提供预挂钩。

Example: Before saving a user to the database, you could call a function that would log the user into to a logging service.示例：在将用户保存到数据库之前，您可以调用 function 将用户登录到日志服务。

如何在 mongoose 中重用 pre 中间件功能 - How to reuse a pre middleware function in mongoose

在预中间件中未定义的猫鼬模型 - Mongoose Model Undefined in Pre Middleware

mongoose中使用pre中间件删除相关记录 - Delete related records using pre middleware in mongoose

Mongoose - 如何在预（保存/更新）中间件中抛出多个错误？ - Mongoose - How can I throw more than one error in pre (save/update) middleware?

为什么我会使用Redux Promise Middleware而不是Redux Promise？ - Why would I use Redux Promise Middleware over Redux Promise?

为什么不调用用{query：true}删除的猫鼬中间件“ pre”？ - Why mongoose middleware “pre” remove with { query: true } is not called?

Mongoose 前/后中间件没有被调用 model.save - Mongoose pre/post middleware not getting called for model.save

Mongoose预保存第二个保存操作未调用的子文档中间件 - Mongoose pre save middleware of subdocument not called on second save operation

在保存前和保存后的 Mongoose 中间件方法之间共享数据 - Sharing data between Mongoose middleware methods pre save and post save

Express JS Middleware Mongoose 过滤器和排序查询我没有得到我期望得到的结果，它没有排序 - Express JS Middleware Mongoose filter and sort query i dont get what i expect to get and it's not sorting

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