Updating documents in MongoDB

It is possible to modify one or more documents of a collection. The updateOne() and updateMany() class methods are used respectively to modify the first document found or all of the documents found.

These two methods have similar parameters:

• updateMany(conditions, update, callback) indicates modifying the data indicated in the update object on the documents specified by the indicated conditions. The callback function of the form callback(err, response) is called after the update.
• updateOne(conditions, update, callback) indicates modifying the data indicated in the update object on the first document found by the indicated conditions. The callback function of the form callback(err, response) is called after the update.
• Only the conditions and update parameters are mandatory in the two methods.

  Warning

  If the callback is not present in the method, you must use the then() or exec() method afterward, otherwise the update is not done.

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