Update validators validate the update operation against the model’s schema. Same as update(), except MongoDB replace the existing document with the given document (no atomic operators like $set). Signal that we desire an increment of this documents version. By default, Mongoose throws a cast error if localField and foreignField schemas don’t line up. If you enable this option, Mongoose will instead filter out any localField properties that cannot be casted to foreignField’s schema type.

o is an object specifying all mapReduce options as well HP 8600 driver as the map and reduce functions. All options are delegated to the driver implementation.

If true, execute writes in order and stop at the first error. If false, execute writes in parallel and continue until all writes have either succeeded or errored. object containing the fields that were selected in the query which returned this document.

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Passing the same path a second time will overwrite the previous path options. Checks if path was selected in the source query which initialized this document. If path is given, checks if a path or any full path containing path as part of its path chain has been modified. The errorMsg argument will become the message of the ValidationError.

You do not need to set this parameter to ensure Mongoose handles your query projection. ValidationError if there are errors during validation, or undefined if there is no error. This method is called pre save and if a validation rule is violated, save is aborted and the error is returned to your callback. if false and timestamps are enabled, skip timestamps for this save(). Sends a replaceOne command with this document _id as the query selector. Population does not occur unless a callback is passed or you explicitly call execPopulate().

See node-mongodb-native mapReduce() documentation for more detail about options. Mongoose always validates each document before sending insertMany to MongoDB. So if one document has a validation error, no documents will be saved, unless you set the ordered option to false. By default, if you don’t include any update operators in update, Mongoose will wrap update in $set for you. An alternative to this would be using Model.findOneAndReplace. Event emitter that reports any errors that occurred. After completion, an index event is emitted on this Model passing an error if one occurred.

This function does not trigger any middleware, neither save(), nor update(). If you need to trigger save() middleware for every document use create() instead. Sends multiple insertOne, updateOne, updateMany, replaceOne, deleteOne, and/or deleteMany operations to the MongoDB server in one command. This is faster than sending multiple independent operations (e.g. if you use create()) because with bulkWrite() there is only one round trip to MongoDB.

MongoDB will update only the first document that matches filter regardless of the value of the multi option. Use pre(‘updateMany’) and post(‘updateMany’) instead. Mongoose casts values and runs setters when using update. All update values are cast to their appropriate SchemaTypes before being sent. By default, if you don’t include any update operators in doc, Mongoose will wrap doc in $set for you. This prevents you from accidentally overwriting the document.

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