node.js - Mongoose find By condition otherwise find all ($or)

Question

if you pass categoryId it will return category with that categoryId but if you don't pass it, I want this route to return all categories... I tried this with $or but it always returns all categories regardless of I passed categoryId or not :

await Category.find({ $or: [{ _id: categoryId }, {}] });

I can use the if statement but it takes a lot of code, can this be done cleaner?

Answer 1

Something like this:

await Category.find({ _id: (categoryId || {$exists: true}) });