Hello community! I have a problem, I want to create a controller in mongoDB that returns all the orders that a certain user makes in an ecommerce

Question

This is the function: enter image description here

This is the error:
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Although both collections are correctly related, and I know this because in the database, each order has its respective user as property, when making the GET request, it tells me that the user's id is undefined.

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The route is fine, the relation of both collections is also, I don't know what the error is, please help, thank you very much in advance.