How can the .pre() middleware function in Mongoose be utilized?

I'm curious about the use cases for mongoose .pre('validate') and .pre('save'). I understand their functionality, but I'm struggling to think of specific scenarios where I would need to utilize them. Can't all necessary actions be handled directly in code? Also, what distinguishes between validate and save?

Apologies if these questions seem basic, I've tried looking into it but haven't found a clear answer on when to incorporate these features

Answer №1

The .pre() function allows for the execution of a specified action before or after a certain event. By utilizing pre-hooks, you can run a function prior to saving a document in the database.

For instance: Prior to saving a user record, a function could be triggered to log the user into a logging service.

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