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I have a collection users whose documents will belong to a company (and each company can have many users). Because I set a unique index on the company name, can I use the name as the foreign key inside the user document, or is it recommended to use the id instead?
If name is unique and is guaranteed to never change, then you can use it, no problem. Although there were cases in my practice when names turned out to be not-so-unique and not-so-immutable (damn requirement changes). So, just to be extra safe, use the id.