Remove all fields that are null

Question

How can I remove all fields that are null from all documents of a given collection?

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I have a collection of documents such as:

{
           


        

Answer 1

You can use the mongo updateMany functionality, but you must do this by specifying the parameter you are going to update, such as the year parameter:

db.collection.updateMany({year: null}, { $unset : { year : 1 }})