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I want to do something like this, but the this keyword doesn't seem to be set inside the update statement.
db.items.update({foo:…}, {$set: {bar: this.foo}}, false, true)
Do I have to use eval to accomplish this?
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Starting from MongoDB 4.2 you can perform Updates with an Aggregation Pipeline. An aggregation pipeline enables more expressive updates including calculated fields and references to other field values in the same document.
MongoDB's update() and save() methods are used to update document into a collection. The update() method updates the values in the existing document while the save() method replaces the existing document with the document passed in save() method.
In MongoDB, upsert is a method that is used to insert and update the value in any operation. In other words, the MongoDB upsert method is a combination of insert and update (insert + update = upsert). By default, the upsert method's value is always false.
Yes, you can't refer to other fields in the modifier. You'll have to use db.eval.
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