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I’m not sure if this is documented anywhere, but the second argument to DBRef() constructor is the literal _id that it refers to, which can be any type of document or BSON object. Typically, it will be an ObjectId, i.e.:

DBRef('db', ObjectId('60e47400d0b09942eb67d890'))

mongosh accepts this as a an input format and also print DBRefs like this.
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I’m not sure if this is documented anywhere, but the second argument to DBRef() constructor is the literal _id that it refers to, which can be any type of document or BSON object. Typically, it will be an ObjectId, i.e.: DBRef( 'db' , ObjectId( '60e47400d0b09942eb67d890' )) mongosh accepts this as a an input format and also print DBRefs like this.

> DBRef("a", ObjectId("5f16b8bebe434dc98cdfc9cb"), "db")
DBRef("a", "5f16b8bebe434dc98cdfc9cb", "db"

where the second argument should include ObjectId(), like the original input.