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Suppose I have two fields F1 and F2. I want to update F1 to become F1 + ", " + F2. Can I do so with a single update command in mongo?
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We can use $set and $inc operators to update any field in MongoDB. The $set operator will set the newly specified value while the $inc operator will increase the value by a specified value.
Use Update Operator Expressions ( $inc and $set ) The db. collection. update() method updates only the corresponding fields in the document.
In MongoDB, the $inc operator is used to increment the value of a field by a specified amount. The $inc operator adds as a new field when the specified field does not exist, and sets the field to the specified amount.
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.
No, you can't do that. You can't use expressions in mongodb updates. The only way is to fetch this document to the client, compose new field value there and issue a prepared update statement.
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