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how can I access the second _id from the mongoDb document?

How can I access the second ID from here?

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Try this:

db.collection.find({job: {_id: theIdYouWantToAccess }})

There's more info in the MongoDB documentation, depending on what you want to do. https://docs.mongodb.com/manual/reference/method/db.collection.find/#query-embedded-documents

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