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How do I target an subdocument in the authors array as shown below, in order to update it?
collection.update({'_id': "4f44af6a024342300e000001"}, {$set: { 'authors.?' }} ) The document:
{ _id: "4f44af6a024342300e000001", title: "A book", created: "2012-02-22T14:12:51.305Z" authors: [{"_id":"4f44af6a024342300e000002"}] } 
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To update a document in MongoDB, we use the update() method. The update() method refreshes the values in a MongoDB collection's existing document. The _id field's value does not change when you update your document.
Update Nested Arrays in Conjunction with $[]The $[<identifier>] filtered positional operator, in conjunction with the $[] all positional operator, can be used to update nested arrays. The following updates the values that are greater than or equal to 8 in the nested grades. questions array if the associated grades.
By specifying actual position of embedded document like this:
// update _id field of first author collection.update({'_id': "4f44af6a024342300e000001"}, {$set: { 'authors.0._id': "1" }} ) Or via positional operator:
// update _id field of first matched by _id author collection.update({'_id': "4f44af6a024342300e000001", //you should specify query for embedded document 'authors._id' : "4f44af6a024342300e000002" }, // you can update only one nested document matched by query {$set: { 'authors.$._id': "1" }} ) If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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