Database integrity in mongo DB with hooks

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I am trying to use mongo DB for my MERN app. So far I have used SQL databases where database integrity has never been an issue.

But mongo being No-SQL does not support foreign key relation which is giving me a hard time.

One solution I could think of is to have a pre-save hook to check if the keys exist. Will that make the system too slow. Is there any other way to achieve this.

I tried using pre-save hooks, so far no issue. It’s just too much code to write in each model.

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